{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "bar-grating-designations-19-w-4-naamm",
 "name": "Bar grating designations: 19-W-4, 19-W-2, 15-SGI-2, 11-W-4 — bearing bar spacing, cross bar spacing, bearing bar sizes and weight per sq ft (NAAMM MBG 531 style)",
 "kind": "standard",
 "category": "Hardware",
 "group": "Materials & stock",
 "year": null,
 "question": "What does bar grating designation 19-W-4 mean, and what bearing bar sizes and weights does it come in?",
 "tags": [
  "bar grating",
  "steel grating",
  "welded bar grating",
  "19-w-4",
  "19w4 grating",
  "floor grating",
  "walkway grating",
  "bearing bar",
  "cross bar",
  "naamm mbg 531",
  "catwalk grating",
  "trench grating"
 ],
 "aliases": [
  "19-w-4 grating meaning",
  "19w4 bar grating dimensions",
  "bar grating designation explained",
  "19-w-4 grating bearing bar spacing 1-3/16",
  "bar grating weight per square foot 1 x 3/16",
  "grating bearing bar sizes chart",
  "naamm mbg 531 grating designation",
  "19-w-2 vs 19-w-4 grating",
  "11-w-4 ada grating",
  "bar grating open area percent",
  "gw-100 grating 1 x 3/16",
  "bar grating clear space between bars",
  "swage locked grating designation"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/bar-grating-designations-19-w-4-naamm/",
 "sheet_txt": "https://xemstudio.com/objects/bar-grating-designations-19-w-4-naamm/sheet.txt",
 "sheet": {
  "basis": "Direct Metals' designation key and size lists, McNichols' welded grating series GW-75 to GW-250, Metals Depot's stock list and two McNichols item pages; numbers only, load tables left out on purpose",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Designation (the NAAMM Metal Bar Grating Manual, MBG 531, system as the distributors print it): the first number is the centre-to-centre spacing of the bearing bars in sixteenths of an inch (19 = 19/16 = 1-3/16 in), the letter(s) give the method (W welded steel, SG swaged rectangular bar, SGF swaged flush top, SGI swaged I-bar, R riveted steel, AR riveted aluminum), and the last number is the cross bar spacing in inches (usually 4 or 2); for riveted grating it is the rivet spacing (7, 3-1/2 or 5 in) and the first number is the space between bars, not centre to centre. So 19-W-4 is welded steel grating with bearing bars on 1-3/16 in centres and cross bars on 4 in centres. The MBG 531 manual itself was not read (the copies found are behind a login or a document site); the key above is as Direct Metals prints it and McNichols prints 'product spacing designation: 19-W-4 (19 = 1-3/16 in bearing bar spacing, W = welded, 4 = 4 in cross bar spacing)'.",
   "Bearing bar size is height (depth) × thickness, in inches. Standard-duty 19-W-4 steel uses bars from 3/4 × 1/8 to 2-1/2 × 3/16 in (McNichols series GW-75 to GW-250); heavy-duty welded bars run 1 × 1/4 to 6 × 1/2 in (Direct Metals; standard centres 15/16, 13/16, 1-3/8, 1-7/8 and 2-3/8 in). The clear space between bearing bars is the centre spacing minus the bar thickness (computed here): 1-3/16 − 3/16 = 1 in, which McNichols prints for GW-175. Open area also depends on the cross bars: McNichols prints 77% for 1-3/4 × 3/16 with 1/4 in twisted cross rods, a Sweets submittal sheet prints 83% for 1/8 in bars.",
   "Weights disagree between sellers and finishes: 1 × 3/16 in 19-W-4 is 7.5 lb per sq ft at McNichols and 7.30 (black) or 7.67 (galvanized) at Metals Depot; 2 × 3/16 is 14.1 and 13.90 / 14.20; 1-1/2 × 3/16 is 10.8 and 10.60 / 11.00. The 19-W-2 column in the McNichols sheet adds 0.9 lb per sq ft over 19-W-4 for every bar size (the extra cross bars). Metals Depot lists the bar as thickness × depth (1/8 × 1) where McNichols lists height × thickness (1 × 1/8); the page shows depth × thickness for both.",
   "Left out on purpose: span / load / deflection tables (they belong to the maker's published load tables for the exact series and finish), serrated-surface and ADA-specific details beyond the 11-W-4 stock rows, aluminum swaged and I-bar weights (the extract was garbled) and panel-width charts. No file: a grating panel's cross bar (twisted rod) and weld geometry are not published as numbers. McNichols publishes a spec sheet and CAD drawing PDF per grating item (the item page is linked, nothing is copied). Expanded steel and aluminum grating (also sold by pounds per sq ft): expanded-metal-standard-designations-swd-lwd."
  ],
  "table": {
   "columns": [
    "source",
    "designation",
    "bearing bar size (depth × thickness)",
    "bearing bar spacing",
    "clear space between bars (computed)",
    "cross bar spacing / size",
    "method / material",
    "weight (lb per sq ft)",
    "note"
   ],
   "rows": [
    [
     "Direct Metals key",
     "19-W-4",
     "—",
     "19/16 in (1-3/16) centre to centre",
     "—",
     "4 in centre to centre",
     "welded steel",
     "—",
     "first number = bearing bar spacing in 1/16 in (30.16 mm centre to centre)"
    ],
    [
     "Direct Metals key",
     "19-W-2",
     "—",
     "19/16 in (1-3/16) centre to centre",
     "—",
     "2 in centre to centre",
     "welded steel",
     "—",
     "first number = bearing bar spacing in 1/16 in (30.16 mm centre to centre)"
    ],
    [
     "Direct Metals key",
     "15-SGI-2",
     "—",
     "15/16 in centre to centre",
     "—",
     "2 in centre to centre",
     "swaged I-bar",
     "—",
     "first number = bearing bar spacing in 1/16 in (23.81 mm centre to centre)"
    ],
    [
     "Direct Metals key",
     "38-W-4 (or 2)",
     "—",
     "38/16 in (2-3/8) centre to centre",
     "—",
     "4 in (or 2) centre to centre",
     "welded steel",
     "—",
     "first number = bearing bar spacing in 1/16 in (60.32 mm centre to centre)"
    ],
    [
     "Direct Metals key",
     "30-W-4 (or 2)",
     "—",
     "30/16 in (1-7/8) centre to centre",
     "—",
     "4 in (or 2) centre to centre",
     "welded steel",
     "—",
     "first number = bearing bar spacing in 1/16 in (47.62 mm centre to centre)"
    ],
    [
     "Direct Metals key",
     "22-W-4 (or 2)",
     "—",
     "22/16 in (1-3/8) centre to centre",
     "—",
     "4 in (or 2) centre to centre",
     "welded steel",
     "—",
     "first number = bearing bar spacing in 1/16 in (34.92 mm centre to centre)"
    ],
    [
     "Direct Metals key",
     "11-SG-4 (or 2)",
     "—",
     "11/16 in centre to centre",
     "—",
     "4 in (or 2) centre to centre",
     "swaged rectangular bar",
     "—",
     "first number = bearing bar spacing in 1/16 in (17.46 mm centre to centre)"
    ],
    [
     "Direct Metals key",
     "7-SG-4 (or 2)",
     "—",
     "7/16 in centre to centre",
     "—",
     "4 in (or 2) centre to centre",
     "swaged rectangular bar",
     "—",
     "first number = bearing bar spacing in 1/16 in (11.11 mm centre to centre)"
    ],
    [
     "Direct Metals key",
     "18-R-7 (or 3-1/2)",
     "—",
     "18/16 in = 1-1/8 in space between bars",
     "—",
     "7 in (or 3-1/2) rivet spacing",
     "riveted steel",
     "—",
     "riveted grating marking is the space between bars, not centre to centre"
    ],
    [
     "Direct Metals key",
     "37-R-5",
     "—",
     "37/16 in = 2-5/16 in space between bars",
     "—",
     "5 in rivet spacing",
     "riveted steel",
     "—",
     "riveted grating marking is the space between bars, not centre to centre"
    ],
    [
     "Direct Metals key",
     "12-R-7 (or 3-1/2)",
     "—",
     "12/16 in = 3/4 in space between bars",
     "—",
     "7 in (or 3-1/2) rivet spacing",
     "riveted steel",
     "—",
     "riveted grating marking is the space between bars, not centre to centre"
    ],
    [
     "McNichols GW-75-A",
     "19-W-4",
     "3/4 × 1/8 in",
     "1-3/16 in",
     "1.0625 in (27.0 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "4.1",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-75-A",
     "19-W-2",
     "3/4 × 1/8 in",
     "1-3/16 in",
     "1.0625 in (27.0 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "5.0",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-75",
     "19-W-4",
     "3/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "5.8",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-75",
     "19-W-2",
     "3/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "6.7",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-100-A",
     "19-W-4",
     "1 × 1/8 in",
     "1-3/16 in",
     "1.0625 in (27.0 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "5.2",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-100-A",
     "19-W-2",
     "1 × 1/8 in",
     "1-3/16 in",
     "1.0625 in (27.0 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "6.1",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-100",
     "19-W-4",
     "1 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "7.5",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-100",
     "19-W-2",
     "1 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "8.4",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-125-A",
     "19-W-4",
     "1-1/4 × 1/8 in",
     "1-3/16 in",
     "1.0625 in (27.0 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "6.3",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-125-A",
     "19-W-2",
     "1-1/4 × 1/8 in",
     "1-3/16 in",
     "1.0625 in (27.0 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "7.2",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-125",
     "19-W-4",
     "1-1/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "9.1",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-125",
     "19-W-2",
     "1-1/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "10.0",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-150-A",
     "19-W-4",
     "1-1/2 × 1/8 in",
     "1-3/16 in",
     "1.0625 in (27.0 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "7.4",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-150-A",
     "19-W-2",
     "1-1/2 × 1/8 in",
     "1-3/16 in",
     "1.0625 in (27.0 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "8.3",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-150",
     "19-W-4",
     "1-1/2 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "10.8",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-150",
     "19-W-2",
     "1-1/2 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "11.7",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-175",
     "19-W-4",
     "1-3/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "12.5",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-175",
     "19-W-2",
     "1-3/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "13.4",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-200",
     "19-W-4",
     "2 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "14.1",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-200",
     "19-W-2",
     "2 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "15.0",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-225",
     "19-W-4",
     "2-1/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "15.8",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-225",
     "19-W-2",
     "2-1/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "16.7",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-250",
     "19-W-4",
     "2-1/2 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "17.4",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "McNichols GW-250",
     "19-W-2",
     "2-1/2 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "2 in",
     "welded steel, carbon / galvanized (load-table sheet)",
     "18.3",
     "bar depth × thickness; clear space = 1-3/16 − thickness (computed)"
    ],
    [
     "Metals Depot G1181",
     "19-W-4",
     "1 × 1/8 in",
     "1-3/16 in",
     "1.0625 in (27.0 mm)",
     "4 in",
     "welded steel, black, smooth",
     "5.1",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G131634",
     "19-W-4",
     "3/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, black, smooth",
     "5.6",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G13161",
     "19-W-4",
     "1 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, black, smooth",
     "7.3",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G13161-G",
     "19-W-4",
     "1 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, galvanized, smooth",
     "7.67",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G1316114",
     "19-W-4",
     "1-1/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, black, smooth",
     "8.9",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G1316114-G",
     "19-W-4",
     "1-1/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, galvanized, smooth",
     "9.35",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G1316112",
     "19-W-4",
     "1-1/2 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, black, smooth",
     "10.6",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G1316112-G",
     "19-W-4",
     "1-1/2 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, galvanized, smooth",
     "11.0",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G1316134S",
     "19-W-4",
     "1-3/4 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, black, serrated",
     "12.2",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G13162",
     "19-W-4",
     "2 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, black, smooth",
     "13.9",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G13162-G",
     "19-W-4",
     "2 × 3/16 in",
     "1-3/16 in",
     "1.0000 in (25.4 mm)",
     "4 in",
     "welded steel, galvanized, smooth",
     "14.2",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G114112",
     "19-W-4",
     "1-1/2 × 1/4 in",
     "1-3/16 in",
     "0.9375 in (23.8 mm)",
     "4 in",
     "welded steel, black, smooth, heavy duty",
     "13.51",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G1142",
     "19-W-4",
     "2 × 1/4 in",
     "1-3/16 in",
     "0.9375 in (23.8 mm)",
     "4 in",
     "welded steel, black, smooth, heavy duty",
     "18.7",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G114212",
     "19-W-4",
     "2-1/2 × 1/4 in",
     "1-3/16 in",
     "0.9375 in (23.8 mm)",
     "4 in",
     "welded steel, black, smooth, heavy duty",
     "23.09",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G1143",
     "19-W-4",
     "3 × 1/4 in",
     "1-3/16 in",
     "0.9375 in (23.8 mm)",
     "4 in",
     "welded steel, black, smooth, heavy duty",
     "27.5",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G13161-11W4-P",
     "11-W-4",
     "1 × 3/16 in",
     "11/16 in",
     "0.5000 in (12.7 mm)",
     "4 in",
     "welded steel, black, smooth, ADA",
     "11.9",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G1316114-11W4P",
     "11-W-4",
     "1-1/4 × 3/16 in",
     "11/16 in",
     "0.5000 in (12.7 mm)",
     "4 in",
     "welded steel, black, smooth, ADA",
     "14.7",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "Metals Depot G1316112-11W4P",
     "11-W-4",
     "1-1/2 × 3/16 in",
     "11/16 in",
     "0.5000 in (12.7 mm)",
     "4 in",
     "welded steel, black, smooth, ADA",
     "17.5",
     "bar listed as thickness × depth by the seller; shown here depth × thickness"
    ],
    [
     "McNichols item 6607310122",
     "19-W-4 (series GW-175)",
     "1-3/4 × 3/16 in",
     "1-3/16 in, 1 in clear",
     "1.0000 in (25.4 mm), printed",
     "4 in; 1/4 in square twisted rod",
     "carbon steel, hot rolled",
     "12.50",
     "77% open area, 10.1053 bars per foot of width (printed)"
    ],
    [
     "Sweets submittal sheet",
     "19-W-4",
     "1/8 in thick",
     "—",
     "—",
     "4 in",
     "welded",
     "—",
     "83% open area (printed, bar 1/8 in thick)"
    ],
    [
     "McNichols item 67153163 (SAFE-T-GRID)",
     "19-S-4 (series TB-940-150)",
     "T-bar 1-1/2 in high, 0.940 in top flange, web 1/8 in, bottom flange 1/4 in",
     "1-3/16 in",
     "—",
     "4 in; 3/8 in square rod",
     "aluminum 6063-T6, swage-locked, grooved",
     "4.30",
     "21% open area"
    ],
    [
     "Direct Metals stock list",
     "19-W-4 light duty stainless",
     "1 × 3/16, 1-1/4 × 3/16, 1-1/2 × 3/16 in",
     "1-3/16 in",
     "—",
     "4 in",
     "stainless 304",
     "—",
     "stocked sizes"
    ],
    [
     "Direct Metals stock list",
     "7-TW-4 (TiteWeld)",
     "3/4 to 2-1/2 in high × 3/16 in in 1/4 in steps",
     "7/16 in",
     "—",
     "4 in",
     "welded steel",
     "13.73 (3/4) to 44.31 (2-1/2)",
     "8 sizes; weights listed in order in a garbled extract, first and last only given"
    ]
   ]
  }
 },
 "sheet_text": "Bar grating designations: 19-W-4, 19-W-2, 15-SGI-2, 11-W-4 — bearing bar spacing, cross bar spacing, bearing bar sizes and weight per sq ft (NAAMM MBG 531 style) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/bar-grating-designations-19-w-4-naamm/  (sheet CC BY 4.0)\nBasis: Direct Metals' designation key and size lists, McNichols' welded grating series GW-75 to GW-250, Metals Depot's stock list and two McNichols item pages; numbers only, load tables left out on purpose\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Designation (the NAAMM Metal Bar Grating Manual, MBG 531, system as the distributors print it): the first number is the centre-to-centre spacing of the bearing bars in sixteenths of an inch (19 = 19/16 = 1-3/16 in), the letter(s) give the method (W welded steel, SG swaged rectangular bar, SGF swaged flush top, SGI swaged I-bar, R riveted steel, AR riveted aluminum), and the last number is the cross bar spacing in inches (usually 4 or 2); for riveted grating it is the rivet spacing (7, 3-1/2 or 5 in) and the first number is the space between bars, not centre to centre. So 19-W-4 is welded steel grating with bearing bars on 1-3/16 in centres and cross bars on 4 in centres. The MBG 531 manual itself was not read (the copies found are behind a login or a document site); the key above is as Direct Metals prints it and McNichols prints 'product spacing designation: 19-W-4 (19 = 1-3/16 in bearing bar spacing, W = welded, 4 = 4 in cross bar spacing)'.\n- Bearing bar size is height (depth) × thickness, in inches. Standard-duty 19-W-4 steel uses bars from 3/4 × 1/8 to 2-1/2 × 3/16 in (McNichols series GW-75 to GW-250); heavy-duty welded bars run 1 × 1/4 to 6 × 1/2 in (Direct Metals; standard centres 15/16, 13/16, 1-3/8, 1-7/8 and 2-3/8 in). The clear space between bearing bars is the centre spacing minus the bar thickness (computed here): 1-3/16 − 3/16 = 1 in, which McNichols prints for GW-175. Open area also depends on the cross bars: McNichols prints 77% for 1-3/4 × 3/16 with 1/4 in twisted cross rods, a Sweets submittal sheet prints 83% for 1/8 in bars.\n- Weights disagree between sellers and finishes: 1 × 3/16 in 19-W-4 is 7.5 lb per sq ft at McNichols and 7.30 (black) or 7.67 (galvanized) at Metals Depot; 2 × 3/16 is 14.1 and 13.90 / 14.20; 1-1/2 × 3/16 is 10.8 and 10.60 / 11.00. The 19-W-2 column in the McNichols sheet adds 0.9 lb per sq ft over 19-W-4 for every bar size (the extra cross bars). Metals Depot lists the bar as thickness × depth (1/8 × 1) where McNichols lists height × thickness (1 × 1/8); the page shows depth × thickness for both.\n- Left out on purpose: span / load / deflection tables (they belong to the maker's published load tables for the exact series and finish), serrated-surface and ADA-specific details beyond the 11-W-4 stock rows, aluminum swaged and I-bar weights (the extract was garbled) and panel-width charts. No file: a grating panel's cross bar (twisted rod) and weld geometry are not published as numbers. McNichols publishes a spec sheet and CAD drawing PDF per grating item (the item page is linked, nothing is copied). Expanded steel and aluminum grating (also sold by pounds per sq ft): expanded-metal-standard-designations-swd-lwd.\n\nsource  designation  bearing bar size (depth × thickness)  bearing bar spacing  clear space between bars (computed)  cross bar spacing / size  method / material  weight (lb per sq ft)  note\nDirect Metals key  19-W-4  —  19/16 in (1-3/16) centre to centre  —  4 in centre to centre  welded steel  —  first number = bearing bar spacing in 1/16 in (30.16 mm centre to centre)\nDirect Metals key  19-W-2  —  19/16 in (1-3/16) centre to centre  —  2 in centre to centre  welded steel  —  first number = bearing bar spacing in 1/16 in (30.16 mm centre to centre)\nDirect Metals key  15-SGI-2  —  15/16 in centre to centre  —  2 in centre to centre  swaged I-bar  —  first number = bearing bar spacing in 1/16 in (23.81 mm centre to centre)\nDirect Metals key  38-W-4 (or 2)  —  38/16 in (2-3/8) centre to centre  —  4 in (or 2) centre to centre  welded steel  —  first number = bearing bar spacing in 1/16 in (60.32 mm centre to centre)\nDirect Metals key  30-W-4 (or 2)  —  30/16 in (1-7/8) centre to centre  —  4 in (or 2) centre to centre  welded steel  —  first number = bearing bar spacing in 1/16 in (47.62 mm centre to centre)\nDirect Metals key  22-W-4 (or 2)  —  22/16 in (1-3/8) centre to centre  —  4 in (or 2) centre to centre  welded steel  —  first number = bearing bar spacing in 1/16 in (34.92 mm centre to centre)\nDirect Metals key  11-SG-4 (or 2)  —  11/16 in centre to centre  —  4 in (or 2) centre to centre  swaged rectangular bar  —  first number = bearing bar spacing in 1/16 in (17.46 mm centre to centre)\nDirect Metals key  7-SG-4 (or 2)  —  7/16 in centre to centre  —  4 in (or 2) centre to centre  swaged rectangular bar  —  first number = bearing bar spacing in 1/16 in (11.11 mm centre to centre)\nDirect Metals key  18-R-7 (or 3-1/2)  —  18/16 in = 1-1/8 in space between bars  —  7 in (or 3-1/2) rivet spacing  riveted steel  —  riveted grating marking is the space between bars, not centre to centre\nDirect Metals key  37-R-5  —  37/16 in = 2-5/16 in space between bars  —  5 in rivet spacing  riveted steel  —  riveted grating marking is the space between bars, not centre to centre\nDirect Metals key  12-R-7 (or 3-1/2)  —  12/16 in = 3/4 in space between bars  —  7 in (or 3-1/2) rivet spacing  riveted steel  —  riveted grating marking is the space between bars, not centre to centre\nMcNichols GW-75-A  19-W-4  3/4 × 1/8 in  1-3/16 in  1.0625 in (27.0 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  4.1  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-75-A  19-W-2  3/4 × 1/8 in  1-3/16 in  1.0625 in (27.0 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  5.0  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-75  19-W-4  3/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  5.8  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-75  19-W-2  3/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  6.7  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-100-A  19-W-4  1 × 1/8 in  1-3/16 in  1.0625 in (27.0 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  5.2  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-100-A  19-W-2  1 × 1/8 in  1-3/16 in  1.0625 in (27.0 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  6.1  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-100  19-W-4  1 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  7.5  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-100  19-W-2  1 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  8.4  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-125-A  19-W-4  1-1/4 × 1/8 in  1-3/16 in  1.0625 in (27.0 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  6.3  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-125-A  19-W-2  1-1/4 × 1/8 in  1-3/16 in  1.0625 in (27.0 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  7.2  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-125  19-W-4  1-1/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  9.1  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-125  19-W-2  1-1/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  10.0  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-150-A  19-W-4  1-1/2 × 1/8 in  1-3/16 in  1.0625 in (27.0 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  7.4  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-150-A  19-W-2  1-1/2 × 1/8 in  1-3/16 in  1.0625 in (27.0 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  8.3  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-150  19-W-4  1-1/2 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  10.8  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-150  19-W-2  1-1/2 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  11.7  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-175  19-W-4  1-3/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  12.5  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-175  19-W-2  1-3/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  13.4  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-200  19-W-4  2 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  14.1  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-200  19-W-2  2 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  15.0  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-225  19-W-4  2-1/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  15.8  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-225  19-W-2  2-1/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  16.7  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-250  19-W-4  2-1/2 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, carbon / galvanized (load-table sheet)  17.4  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMcNichols GW-250  19-W-2  2-1/2 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  2 in  welded steel, carbon / galvanized (load-table sheet)  18.3  bar depth × thickness; clear space = 1-3/16 − thickness (computed)\nMetals Depot G1181  19-W-4  1 × 1/8 in  1-3/16 in  1.0625 in (27.0 mm)  4 in  welded steel, black, smooth  5.1  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G131634  19-W-4  3/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, black, smooth  5.6  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G13161  19-W-4  1 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, black, smooth  7.3  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G13161-G  19-W-4  1 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, galvanized, smooth  7.67  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G1316114  19-W-4  1-1/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, black, smooth  8.9  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G1316114-G  19-W-4  1-1/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, galvanized, smooth  9.35  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G1316112  19-W-4  1-1/2 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, black, smooth  10.6  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G1316112-G  19-W-4  1-1/2 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, galvanized, smooth  11.0  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G1316134S  19-W-4  1-3/4 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, black, serrated  12.2  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G13162  19-W-4  2 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, black, smooth  13.9  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G13162-G  19-W-4  2 × 3/16 in  1-3/16 in  1.0000 in (25.4 mm)  4 in  welded steel, galvanized, smooth  14.2  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G114112  19-W-4  1-1/2 × 1/4 in  1-3/16 in  0.9375 in (23.8 mm)  4 in  welded steel, black, smooth, heavy duty  13.51  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G1142  19-W-4  2 × 1/4 in  1-3/16 in  0.9375 in (23.8 mm)  4 in  welded steel, black, smooth, heavy duty  18.7  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G114212  19-W-4  2-1/2 × 1/4 in  1-3/16 in  0.9375 in (23.8 mm)  4 in  welded steel, black, smooth, heavy duty  23.09  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G1143  19-W-4  3 × 1/4 in  1-3/16 in  0.9375 in (23.8 mm)  4 in  welded steel, black, smooth, heavy duty  27.5  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G13161-11W4-P  11-W-4  1 × 3/16 in  11/16 in  0.5000 in (12.7 mm)  4 in  welded steel, black, smooth, ADA  11.9  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G1316114-11W4P  11-W-4  1-1/4 × 3/16 in  11/16 in  0.5000 in (12.7 mm)  4 in  welded steel, black, smooth, ADA  14.7  bar listed as thickness × depth by the seller; shown here depth × thickness\nMetals Depot G1316112-11W4P  11-W-4  1-1/2 × 3/16 in  11/16 in  0.5000 in (12.7 mm)  4 in  welded steel, black, smooth, ADA  17.5  bar listed as thickness × depth by the seller; shown here depth × thickness\nMcNichols item 6607310122  19-W-4 (series GW-175)  1-3/4 × 3/16 in  1-3/16 in, 1 in clear  1.0000 in (25.4 mm), printed  4 in; 1/4 in square twisted rod  carbon steel, hot rolled  12.50  77% open area, 10.1053 bars per foot of width (printed)\nSweets submittal sheet  19-W-4  1/8 in thick  —  —  4 in  welded  —  83% open area (printed, bar 1/8 in thick)\nMcNichols item 67153163 (SAFE-T-GRID)  19-S-4 (series TB-940-150)  T-bar 1-1/2 in high, 0.940 in top flange, web 1/8 in, bottom flange 1/4 in  1-3/16 in  —  4 in; 3/8 in square rod  aluminum 6063-T6, swage-locked, grooved  4.30  21% open area\nDirect Metals stock list  19-W-4 light duty stainless  1 × 3/16, 1-1/4 × 3/16, 1-1/2 × 3/16 in  1-3/16 in  —  4 in  stainless 304  —  stocked sizes\nDirect Metals stock list  7-TW-4 (TiteWeld)  3/4 to 2-1/2 in high × 3/16 in in 1/4 in steps  7/16 in  —  4 in  welded steel  13.73 (3/4) to 44.31 (2-1/2)  8 sizes; weights listed in order in a garbled extract, first and last only given\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Direct Metals (grating catalogue, hosted on Simplebooklet): Glossary of bar grating: designation key (bearing bar spacing in 1/16 in, method letter, cross bar spacing) and bar grating tables: bearing bar sizes, panel widths, weights — web — Distributor catalogue; numbers only — https://simplebooklet.com/glossaryofbargrating?textonly=1\n- Direct Metals (grating catalogue, hosted on Simplebooklet): Entire bar grating section: designations, bearing bar sizes by type, light and heavy duty welded steel, stainless, aluminum (the text extraction is garbled in places; only clearly legible values used) — web — Distributor catalogue; numbers only — https://simplebooklet.com/entirebargratingsection?textonly=1\n- McNichols: Standard-duty welded bar grating, series GW-75 to GW-250: bearing bar height × thickness and weight in 19-W-4 and 19-W-2 (load table PDF; loads not copied) — web — Maker sheet; numbers only — https://assets.mcnichols.com/content/dam/mcnichols/resources/PDF/LT-SDW-GW-GW2-CS-GV.pdf\n- McNichols: Welded bar grating item 6607310122 (GW-175, 19-W-4): bearing bar 1-3/4 × 3/16, cross bar 1/4 square twisted rod, 77% open, 12.50 lb per sq ft; spec sheet and CAD drawing PDFs — PDF, DWG — Maker site terms (drawings per item; DWG may need a login) [verify license at link] — https://www.mcnichols.com/bar-grating/welded/carbon-steel-cs-66073101\n- McNichols: SAFE-T-GRID aluminum swage-locked T-bar grating TB-940-150 (19-S-4): 1-1/2 in T-bar, 3/8 in square cross bar, 4.30 lb per sq ft, 21% open area — web — Maker page; numbers only — https://www.mcnichols.com/bar-grating/swage-locked/aluminum-al-67153163\n- Metals Depot: Steel bar grating: stock numbers with bearing bar size, 19W4 / 11W4 spacing, 4 in cross bars, weight lb per sq ft, smooth / serrated, black / galvanized — web — Distributor page; numbers only — https://www.metalsdepot.com/steel-products/steel-bar-grating\n- Sweets (manufacturer submittal sheet, maker not named in the text read): Welded bar grating 19-W-4 submittal: 1/8 in bearing bar thickness, 83% open area, cross bars 4 in on centre — web — Submittal sheet; numbers only — https://sweets.construction.com/swts_content_files/1097/484577.pdf\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=bar-grating-designations-19-w-4-naamm\n",
 "sources": [
  {
   "publisher": "Direct Metals (grating catalogue, hosted on Simplebooklet)",
   "title": "Glossary of bar grating: designation key (bearing bar spacing in 1/16 in, method letter, cross bar spacing) and bar grating tables: bearing bar sizes, panel widths, weights",
   "url": "https://simplebooklet.com/glossaryofbargrating?textonly=1",
   "formats": [
    "web"
   ],
   "license": "Distributor catalogue; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Direct Metals (grating catalogue, hosted on Simplebooklet)",
   "title": "Entire bar grating section: designations, bearing bar sizes by type, light and heavy duty welded steel, stainless, aluminum (the text extraction is garbled in places; only clearly legible values used)",
   "url": "https://simplebooklet.com/entirebargratingsection?textonly=1",
   "formats": [
    "web"
   ],
   "license": "Distributor catalogue; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McNichols",
   "title": "Standard-duty welded bar grating, series GW-75 to GW-250: bearing bar height × thickness and weight in 19-W-4 and 19-W-2 (load table PDF; loads not copied)",
   "url": "https://assets.mcnichols.com/content/dam/mcnichols/resources/PDF/LT-SDW-GW-GW2-CS-GV.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker sheet; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McNichols",
   "title": "Welded bar grating item 6607310122 (GW-175, 19-W-4): bearing bar 1-3/4 × 3/16, cross bar 1/4 square twisted rod, 77% open, 12.50 lb per sq ft; spec sheet and CAD drawing PDFs",
   "url": "https://www.mcnichols.com/bar-grating/welded/carbon-steel-cs-66073101",
   "formats": [
    "PDF",
    "DWG"
   ],
   "license": "Maker site terms (drawings per item; DWG may need a login)",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McNichols",
   "title": "SAFE-T-GRID aluminum swage-locked T-bar grating TB-940-150 (19-S-4): 1-1/2 in T-bar, 3/8 in square cross bar, 4.30 lb per sq ft, 21% open area",
   "url": "https://www.mcnichols.com/bar-grating/swage-locked/aluminum-al-67153163",
   "formats": [
    "web"
   ],
   "license": "Maker page; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Metals Depot",
   "title": "Steel bar grating: stock numbers with bearing bar size, 19W4 / 11W4 spacing, 4 in cross bars, weight lb per sq ft, smooth / serrated, black / galvanized",
   "url": "https://www.metalsdepot.com/steel-products/steel-bar-grating",
   "formats": [
    "web"
   ],
   "license": "Distributor page; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Sweets (manufacturer submittal sheet, maker not named in the text read)",
   "title": "Welded bar grating 19-W-4 submittal: 1/8 in bearing bar thickness, 83% open area, cross bars 4 in on centre",
   "url": "https://sweets.construction.com/swts_content_files/1097/484577.pdf",
   "formats": [
    "web"
   ],
   "license": "Submittal sheet; numbers only",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "expanded-metal-standard-designations-swd-lwd",
  "perforated-metal-round-hole-standard-patterns",
  "bar-stock-sizes-round-square-steel-aluminum",
  "aluminum-flat-bar-and-round-bar-sizes",
  "stainless-steel-round-and-flat-bar-sizes",
  "strut-channel-1-5-8"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/",
 "mating": [],
 "faq": [
  {
   "q": "What does 19-W-4 grating mean?",
   "a": "Welded steel grating with bearing bars on 19/16 in = 1-3/16 in centres and cross bars on 4 in centres (Direct Metals; McNichols)."
  },
  {
   "q": "What is the difference between 19-W-4 and 19-W-2?",
   "a": "Same bearing bar spacing, but cross bars every 2 in instead of 4 in. McNichols' sheet adds 0.9 lb per sq ft for 19-W-2 at every bar size, for example 7.5 against 8.4 for 1 × 3/16."
  },
  {
   "q": "What size are the bearing bars of 19-W-4 grating?",
   "a": "Standard-duty stock runs 3/4 × 1/8 to 2-1/2 × 3/16 in (McNichols GW-75 to GW-250); Metals Depot also lists 1/4 in bars from 1-1/2 to 3 in high."
  },
  {
   "q": "How much does 1 × 3/16 19-W-4 grating weigh?",
   "a": "7.5 lb per sq ft (McNichols GW-100); 7.30 black and 7.67 galvanized (Metals Depot)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/bar-grating-designations-19-w-4-naamm/index.md"
}