{
 "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": "grease-fittings-sae-j534-din-71412",
 "name": "Grease (Zerk) fittings: SAE-LT 1/4-28, 1/8 PTF and DIN 71412 forms A, B, C (M6, M8, M10, R1/8, R1/4) — hex size, overall length, 45° / 90°",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What hex size and thread does a grease zerk fitting have, and how long are the straight, 45° and 90° types?",
 "tags": [
  "grease fitting",
  "zerk fitting",
  "grease nipple",
  "lube fitting",
  "sae j534",
  "din 71412",
  "alemite",
  "1/4-28 sae-lt",
  "fastener"
 ],
 "aliases": [
  "zerk fitting size",
  "grease fitting hex size",
  "1/4-28 grease fitting dimensions",
  "1/8 npt grease fitting hex",
  "45 degree grease fitting length",
  "90 degree zerk fitting dimensions",
  "m6 grease nipple hex size",
  "m10 grease nipple din 71412",
  "grease fitting thread size chart",
  "sae-lt grease fitting",
  "din 71412 dimensions",
  "grease zerk 5/16 hex overall length"
 ],
 "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/grease-fittings-sae-j534-din-71412/",
 "sheet_txt": "https://xemstudio.com/objects/grease-fittings-sae-j534-din-71412/sheet.txt",
 "sheet": {
  "basis": "Alemite's data sheets for 1/4-28 SAE-LT and 1/8 PTF fittings (with McMaster-Carr's category table as a cross-check), AFT / Kipp K1132 data sheets for DIN 71412 forms A and B, Bollhoff's form C sheet and a Wuerth form B listing; numbers only",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "SAE grease fittings (the 'Zerk' type): the common thread is 1/4-28 taper, called SAE-LT on the Alemite sheets, assembled into a 1/4-28 UNF class 3B straight threaded hole (Alemite: modified maximum minor diameter 0.2151 in), and 1/8 PTF (Dryseal pipe thread, tapered; the Alemite sheet prints 'SAE SPL' on the short ones). The SAE J534 document itself was not read, so no value is attributed to it; the rows are the makers' tables. Alemite's columns: hex size, overall length, shank length. Straight 1/4-28 fittings are 5/16 in hex (3/8 in hex for the angled ones), 17/32 to 1-5/8 in overall; 1/8 PTF fittings are mostly 7/16 in hex.",
   "McMaster-Carr's table for zinc-plated 1/4-28 SAE-LT fittings agrees on hex size and overall length with Alemite for the straight 35/64, 11/16, 31/32, 1-1/8 and 1-5/8 in fittings and the 3/4 in 90° one, but its 'thread length' column (7/64, 13/64, 13/64, 13/64, 1/4 in) is not Alemite's shank length (3/16, 23/64, 5/8, 25/32, 1 in); Alemite's 45° 13/16 in fitting has a 13/64 in shank against McMaster's 5/32 in thread length. McMaster also lists self-tapping, 65° and 303 stainless fittings; only the plain ones are shown. Drive-type (push-in) fittings and the double 70° fitting on the Alemite sheets are not tabulated.",
   "DIN 71412 (conical-head grease nipples): the AFT / Kipp K1132 sheets give form A (straight) and form B (45°) for M6x1, M8x1, M8x1.25, M10x1, M10x1.5, R1/8 and R1/4, with their own letters (A, D, L1, L max, SW) that the sheet does not define; SW is read as the hex wrench size since it matches the usual values (7, 9, 11, 14 mm). Form C (90°, Bollhoff): M6x1 and M8x1 s 9 mm, l 14.3 mm; M10x1 s 11 mm, l 15.3 mm. A Wuerth form B M10x1 listing prints thread length 5.5 mm, wrench size 11 and overall length 25 mm; AFT's form B prints L max 23 for the same nut, so the overall length of form B is shown as printed by each. Form A SW for M6 is 7 mm (AFT) and for form C Bollhoff prints 9 mm: the forms have different hex sizes. The DIN text itself was not read. Steel versions are hardened to min 550 HV 1 and zinc-plated; stainless to 1.4305 (AFT).",
   "No file: the ball-check head profile (spherical head diameter, neck) and the hex height are not published as numbers in any source read; a hex-plus-cylinder envelope would not describe the part. McMaster-Carr sells grease fittings with per-part STEP; its 1/4-28 SAE-LT category is linked, not copied. Thread data for the pipe-thread versions: npt-thread-dimensions-asme-b1-20-1, an-jic-37-degree-flare-fittings."
  ],
  "table": {
   "columns": [
    "source / series",
    "part or material",
    "thread",
    "form / angle",
    "hex (AF)",
    "overall length",
    "shank / thread length / other",
    "note"
   ],
   "rows": [
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "1641-B",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "35/64 in",
     "3/16 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "1652-B",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "11/16 in",
     "23/64 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "1680-B",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "31/32 in",
     "5/8 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "1698-B",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "1-1/8 in",
     "25/32 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "3014-B",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "1-5/8 in",
     "1 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "1637-B1",
     "1/4-28 SAE-LT",
     "45°",
     "3/8 in",
     "13/16 in",
     "13/64 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "3010-B1",
     "1/4-28 SAE-LT",
     "65°",
     "3/8 in",
     "25/32 in",
     "19/64 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "1911-B1",
     "1/4-28 SAE-LT",
     "90°",
     "3/8 in",
     "3/4 in",
     "13/64 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "1966-S (stainless)",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "17/32 in",
     "3/16 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "1968-S (stainless)",
     "1/4-28 SAE-LT",
     "45°",
     "3/8 in",
     "13/16 in",
     "13/64 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/4-28 taper (SAE-LT)",
     "1969-S (stainless)",
     "1/4-28 SAE-LT",
     "90°",
     "3/8 in",
     "3/4 in",
     "13/64 in (shank)",
     "Alemite data sheets"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1644-B",
     "1/8 PTF",
     "straight",
     "7/16 in",
     "9/16 in",
     "15/64 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1610-BL",
     "1/8 PTF",
     "straight",
     "7/16 in",
     "11/16 in",
     "19/64 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1607-B",
     "1/8 PTF",
     "straight",
     "7/16 in",
     "1-1/4 in",
     "25/32 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1669-B",
     "1/8 PTF",
     "straight",
     "7/16 in",
     "1-3/4 in",
     "1-17/64 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1618-B",
     "1/8 PTF",
     "straight",
     "1/2 in",
     "1 in",
     "9/32 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1958",
     "1/8 PTF",
     "straight",
     "7/16 in",
     "31/32 in",
     "1/4 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1611-B",
     "1/8 PTF",
     "30°",
     "7/16 in",
     "29/32 in",
     "19/64 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1688-B",
     "1/8 PTF",
     "45°",
     "7/16 in",
     "57/64 in",
     "19/64 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1620-B",
     "1/8 PTF",
     "45°",
     "7/16 in",
     "1-1/8 in",
     "13/32 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1612-B",
     "1/8 PTF",
     "65°",
     "7/16 in",
     "27/32 in",
     "19/64 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1613-B",
     "1/8 PTF",
     "90°",
     "7/16 in",
     "27/32 in",
     "19/64 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1606-B",
     "1/8 PTF",
     "90°",
     "7/16 in",
     "1-13/16 in",
     "1-1/4 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1961-S (stainless)",
     "1/8 PTF",
     "straight",
     "7/16 in",
     "3/4 in",
     "5/16 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1921-S (stainless)",
     "1/8 PTF",
     "30°",
     "7/16 in",
     "1-1/4 in",
     "11/32 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1922-S (stainless)",
     "1/8 PTF",
     "67.5°",
     "7/16 in",
     "61/64 in",
     "11/32 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "Alemite, 1/8 PTF (sheet labels 'SAE SPL')",
     "1923-S (stainless)",
     "1/8 PTF",
     "90°",
     "7/16 in",
     "7/8 in",
     "11/32 in (shank)",
     "Alemite data sheets; 1/8 PTF is a tapered pipe thread"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "zinc-plated steel",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "35/64 in",
     "7/64 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "zinc-plated steel",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "11/16 in",
     "13/64 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "zinc-plated steel",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "31/32 in",
     "13/64 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "zinc-plated steel",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "1-1/8 in",
     "13/64 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "zinc-plated steel",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "1-5/8 in",
     "1/4 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "303 stainless",
     "1/4-28 SAE-LT",
     "straight",
     "5/16 in",
     "17/32 in",
     "7/64 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "303 stainless",
     "1/4-28 SAE-LT",
     "straight",
     "9/32 in",
     "19/32 in",
     "7/32 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "zinc-plated steel",
     "1/4-28 SAE-LT",
     "90°",
     "3/8 in",
     "3/4 in",
     "5/32 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "zinc-plated steel",
     "1/4-28 SAE-LT",
     "90°",
     "3/8 in",
     "51/64 in",
     "5/16 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "zinc-plated steel",
     "1/4-28 SAE-LT",
     "65°",
     "3/8 in",
     "49/64 in",
     "13/64 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "zinc-plated steel",
     "1/4-28 SAE-LT",
     "45°",
     "3/8 in",
     "13/16 in",
     "5/32 in (thread length)",
     "category table as printed"
    ],
    [
     "McMaster-Carr, 1/4-28 SAE-LT (as printed)",
     "zinc-plated steel",
     "1/4-28 SAE-LT",
     "45°",
     "3/8 in",
     "63/64 in",
     "5/16 in (thread length)",
     "category table as printed"
    ],
    [
     "DIN 71412 form A, straight (AFT / Kipp K1132, mm)",
     "M6x1",
     "M6x1",
     "A, 0°",
     "7 mm (SW)",
     "L1 16 mm",
     "D 6 mm",
     "letters as printed on the sheet, not defined there"
    ],
    [
     "DIN 71412 form A, straight (AFT / Kipp K1132, mm)",
     "M8x1",
     "M8x1",
     "A, 0°",
     "9 mm (SW)",
     "L1 16 mm",
     "D 6 mm",
     "letters as printed on the sheet, not defined there"
    ],
    [
     "DIN 71412 form A, straight (AFT / Kipp K1132, mm)",
     "M8x1.25",
     "M8x1.25",
     "A, 0°",
     "9 mm (SW)",
     "L1 16 mm",
     "D 6 mm",
     "letters as printed on the sheet, not defined there"
    ],
    [
     "DIN 71412 form A, straight (AFT / Kipp K1132, mm)",
     "M10x1",
     "M10x1",
     "A, 0°",
     "11 mm (SW)",
     "L1 16 mm",
     "D 6 mm",
     "letters as printed on the sheet, not defined there"
    ],
    [
     "DIN 71412 form A, straight (AFT / Kipp K1132, mm)",
     "M10x1.5",
     "M10x1.5",
     "A, 0°",
     "11 mm (SW)",
     "L1 16 mm",
     "D 6 mm",
     "letters as printed on the sheet, not defined there"
    ],
    [
     "DIN 71412 form A, straight (AFT / Kipp K1132, mm)",
     "R1/8",
     "R1/8",
     "A, 0°",
     "11 mm (SW)",
     "L1 16 mm",
     "D 6 mm",
     "letters as printed on the sheet, not defined there"
    ],
    [
     "DIN 71412 form A, straight (AFT / Kipp K1132, mm)",
     "R1/4",
     "R1/4",
     "A, 0°",
     "14 mm (SW)",
     "L1 16 mm",
     "D 6 mm",
     "letters as printed on the sheet, not defined there"
    ],
    [
     "DIN 71412 form B, 45° (AFT / Kipp K1132, mm)",
     "M6x1",
     "M6x1",
     "B, 45°",
     "9 mm (SW)",
     "L max 23 mm",
     "L1 5.5 mm; A 10.5 mm",
     "letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11"
    ],
    [
     "DIN 71412 form B, 45° (AFT / Kipp K1132, mm)",
     "M8x1",
     "M8x1",
     "B, 45°",
     "9 mm (SW)",
     "L max 23 mm",
     "L1 5.5 mm; A 10.5 mm",
     "letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11"
    ],
    [
     "DIN 71412 form B, 45° (AFT / Kipp K1132, mm)",
     "M8x1.25",
     "M8x1.25",
     "B, 45°",
     "9 mm (SW)",
     "L max 23 mm",
     "L1 5.5 mm; A 10.5 mm",
     "letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11"
    ],
    [
     "DIN 71412 form B, 45° (AFT / Kipp K1132, mm)",
     "M10x1",
     "M10x1",
     "B, 45°",
     "11 mm (SW)",
     "L max 23 mm",
     "L1 5.5 mm; A 11.5 mm",
     "letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11"
    ],
    [
     "DIN 71412 form B, 45° (AFT / Kipp K1132, mm)",
     "M10x1.5",
     "M10x1.5",
     "B, 45°",
     "11 mm (SW)",
     "L max 23 mm",
     "L1 5.5 mm; A 11.5 mm",
     "letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11"
    ],
    [
     "DIN 71412 form B, 45° (AFT / Kipp K1132, mm)",
     "R1/8",
     "R1/8",
     "B, 45°",
     "11 mm (SW)",
     "L max 23 mm",
     "L1 5.5 mm; A 11.5 mm",
     "letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11"
    ],
    [
     "DIN 71412 form B, 45° (AFT / Kipp K1132, mm)",
     "R1/4",
     "R1/4",
     "B, 45°",
     "14 mm (SW)",
     "L max 23 mm",
     "L1 5.5 mm; A 12 mm",
     "letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11"
    ],
    [
     "DIN 71412 form C, 90° (Bollhoff, mm)",
     "M6x1",
     "M6x1",
     "C, 90°",
     "9 mm (s)",
     "14.3 mm (l)",
     "—",
     "Bollhoff steel 5.8 zinc, conical thread"
    ],
    [
     "DIN 71412 form C, 90° (Bollhoff, mm)",
     "M8x1",
     "M8x1",
     "C, 90°",
     "9 mm (s)",
     "14.3 mm (l)",
     "—",
     "Bollhoff steel 5.8 zinc, conical thread"
    ],
    [
     "DIN 71412 form C, 90° (Bollhoff, mm)",
     "M10x1",
     "M10x1",
     "C, 90°",
     "11 mm (s)",
     "15.3 mm (l)",
     "—",
     "Bollhoff steel 5.8 zinc, conical thread"
    ]
   ]
  }
 },
 "sheet_text": "Grease (Zerk) fittings: SAE-LT 1/4-28, 1/8 PTF and DIN 71412 forms A, B, C (M6, M8, M10, R1/8, R1/4) — hex size, overall length, 45° / 90° — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/grease-fittings-sae-j534-din-71412/  (sheet CC BY 4.0)\nBasis: Alemite's data sheets for 1/4-28 SAE-LT and 1/8 PTF fittings (with McMaster-Carr's category table as a cross-check), AFT / Kipp K1132 data sheets for DIN 71412 forms A and B, Bollhoff's form C sheet and a Wuerth form B listing; numbers only\nCatalog version: 2026-10-20\n\nSizes: see table below\n- SAE grease fittings (the 'Zerk' type): the common thread is 1/4-28 taper, called SAE-LT on the Alemite sheets, assembled into a 1/4-28 UNF class 3B straight threaded hole (Alemite: modified maximum minor diameter 0.2151 in), and 1/8 PTF (Dryseal pipe thread, tapered; the Alemite sheet prints 'SAE SPL' on the short ones). The SAE J534 document itself was not read, so no value is attributed to it; the rows are the makers' tables. Alemite's columns: hex size, overall length, shank length. Straight 1/4-28 fittings are 5/16 in hex (3/8 in hex for the angled ones), 17/32 to 1-5/8 in overall; 1/8 PTF fittings are mostly 7/16 in hex.\n- McMaster-Carr's table for zinc-plated 1/4-28 SAE-LT fittings agrees on hex size and overall length with Alemite for the straight 35/64, 11/16, 31/32, 1-1/8 and 1-5/8 in fittings and the 3/4 in 90° one, but its 'thread length' column (7/64, 13/64, 13/64, 13/64, 1/4 in) is not Alemite's shank length (3/16, 23/64, 5/8, 25/32, 1 in); Alemite's 45° 13/16 in fitting has a 13/64 in shank against McMaster's 5/32 in thread length. McMaster also lists self-tapping, 65° and 303 stainless fittings; only the plain ones are shown. Drive-type (push-in) fittings and the double 70° fitting on the Alemite sheets are not tabulated.\n- DIN 71412 (conical-head grease nipples): the AFT / Kipp K1132 sheets give form A (straight) and form B (45°) for M6x1, M8x1, M8x1.25, M10x1, M10x1.5, R1/8 and R1/4, with their own letters (A, D, L1, L max, SW) that the sheet does not define; SW is read as the hex wrench size since it matches the usual values (7, 9, 11, 14 mm). Form C (90°, Bollhoff): M6x1 and M8x1 s 9 mm, l 14.3 mm; M10x1 s 11 mm, l 15.3 mm. A Wuerth form B M10x1 listing prints thread length 5.5 mm, wrench size 11 and overall length 25 mm; AFT's form B prints L max 23 for the same nut, so the overall length of form B is shown as printed by each. Form A SW for M6 is 7 mm (AFT) and for form C Bollhoff prints 9 mm: the forms have different hex sizes. The DIN text itself was not read. Steel versions are hardened to min 550 HV 1 and zinc-plated; stainless to 1.4305 (AFT).\n- No file: the ball-check head profile (spherical head diameter, neck) and the hex height are not published as numbers in any source read; a hex-plus-cylinder envelope would not describe the part. McMaster-Carr sells grease fittings with per-part STEP; its 1/4-28 SAE-LT category is linked, not copied. Thread data for the pipe-thread versions: npt-thread-dimensions-asme-b1-20-1, an-jic-37-degree-flare-fittings.\n\nsource / series  part or material  thread  form / angle  hex (AF)  overall length  shank / thread length / other  note\nAlemite, 1/4-28 taper (SAE-LT)  1641-B  1/4-28 SAE-LT  straight  5/16 in  35/64 in  3/16 in (shank)  Alemite data sheets\nAlemite, 1/4-28 taper (SAE-LT)  1652-B  1/4-28 SAE-LT  straight  5/16 in  11/16 in  23/64 in (shank)  Alemite data sheets\nAlemite, 1/4-28 taper (SAE-LT)  1680-B  1/4-28 SAE-LT  straight  5/16 in  31/32 in  5/8 in (shank)  Alemite data sheets\nAlemite, 1/4-28 taper (SAE-LT)  1698-B  1/4-28 SAE-LT  straight  5/16 in  1-1/8 in  25/32 in (shank)  Alemite data sheets\nAlemite, 1/4-28 taper (SAE-LT)  3014-B  1/4-28 SAE-LT  straight  5/16 in  1-5/8 in  1 in (shank)  Alemite data sheets\nAlemite, 1/4-28 taper (SAE-LT)  1637-B1  1/4-28 SAE-LT  45°  3/8 in  13/16 in  13/64 in (shank)  Alemite data sheets\nAlemite, 1/4-28 taper (SAE-LT)  3010-B1  1/4-28 SAE-LT  65°  3/8 in  25/32 in  19/64 in (shank)  Alemite data sheets\nAlemite, 1/4-28 taper (SAE-LT)  1911-B1  1/4-28 SAE-LT  90°  3/8 in  3/4 in  13/64 in (shank)  Alemite data sheets\nAlemite, 1/4-28 taper (SAE-LT)  1966-S (stainless)  1/4-28 SAE-LT  straight  5/16 in  17/32 in  3/16 in (shank)  Alemite data sheets\nAlemite, 1/4-28 taper (SAE-LT)  1968-S (stainless)  1/4-28 SAE-LT  45°  3/8 in  13/16 in  13/64 in (shank)  Alemite data sheets\nAlemite, 1/4-28 taper (SAE-LT)  1969-S (stainless)  1/4-28 SAE-LT  90°  3/8 in  3/4 in  13/64 in (shank)  Alemite data sheets\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1644-B  1/8 PTF  straight  7/16 in  9/16 in  15/64 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1610-BL  1/8 PTF  straight  7/16 in  11/16 in  19/64 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1607-B  1/8 PTF  straight  7/16 in  1-1/4 in  25/32 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1669-B  1/8 PTF  straight  7/16 in  1-3/4 in  1-17/64 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1618-B  1/8 PTF  straight  1/2 in  1 in  9/32 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1958  1/8 PTF  straight  7/16 in  31/32 in  1/4 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1611-B  1/8 PTF  30°  7/16 in  29/32 in  19/64 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1688-B  1/8 PTF  45°  7/16 in  57/64 in  19/64 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1620-B  1/8 PTF  45°  7/16 in  1-1/8 in  13/32 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1612-B  1/8 PTF  65°  7/16 in  27/32 in  19/64 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1613-B  1/8 PTF  90°  7/16 in  27/32 in  19/64 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1606-B  1/8 PTF  90°  7/16 in  1-13/16 in  1-1/4 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1961-S (stainless)  1/8 PTF  straight  7/16 in  3/4 in  5/16 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1921-S (stainless)  1/8 PTF  30°  7/16 in  1-1/4 in  11/32 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1922-S (stainless)  1/8 PTF  67.5°  7/16 in  61/64 in  11/32 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nAlemite, 1/8 PTF (sheet labels 'SAE SPL')  1923-S (stainless)  1/8 PTF  90°  7/16 in  7/8 in  11/32 in (shank)  Alemite data sheets; 1/8 PTF is a tapered pipe thread\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  zinc-plated steel  1/4-28 SAE-LT  straight  5/16 in  35/64 in  7/64 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  zinc-plated steel  1/4-28 SAE-LT  straight  5/16 in  11/16 in  13/64 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  zinc-plated steel  1/4-28 SAE-LT  straight  5/16 in  31/32 in  13/64 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  zinc-plated steel  1/4-28 SAE-LT  straight  5/16 in  1-1/8 in  13/64 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  zinc-plated steel  1/4-28 SAE-LT  straight  5/16 in  1-5/8 in  1/4 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  303 stainless  1/4-28 SAE-LT  straight  5/16 in  17/32 in  7/64 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  303 stainless  1/4-28 SAE-LT  straight  9/32 in  19/32 in  7/32 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  zinc-plated steel  1/4-28 SAE-LT  90°  3/8 in  3/4 in  5/32 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  zinc-plated steel  1/4-28 SAE-LT  90°  3/8 in  51/64 in  5/16 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  zinc-plated steel  1/4-28 SAE-LT  65°  3/8 in  49/64 in  13/64 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  zinc-plated steel  1/4-28 SAE-LT  45°  3/8 in  13/16 in  5/32 in (thread length)  category table as printed\nMcMaster-Carr, 1/4-28 SAE-LT (as printed)  zinc-plated steel  1/4-28 SAE-LT  45°  3/8 in  63/64 in  5/16 in (thread length)  category table as printed\nDIN 71412 form A, straight (AFT / Kipp K1132, mm)  M6x1  M6x1  A, 0°  7 mm (SW)  L1 16 mm  D 6 mm  letters as printed on the sheet, not defined there\nDIN 71412 form A, straight (AFT / Kipp K1132, mm)  M8x1  M8x1  A, 0°  9 mm (SW)  L1 16 mm  D 6 mm  letters as printed on the sheet, not defined there\nDIN 71412 form A, straight (AFT / Kipp K1132, mm)  M8x1.25  M8x1.25  A, 0°  9 mm (SW)  L1 16 mm  D 6 mm  letters as printed on the sheet, not defined there\nDIN 71412 form A, straight (AFT / Kipp K1132, mm)  M10x1  M10x1  A, 0°  11 mm (SW)  L1 16 mm  D 6 mm  letters as printed on the sheet, not defined there\nDIN 71412 form A, straight (AFT / Kipp K1132, mm)  M10x1.5  M10x1.5  A, 0°  11 mm (SW)  L1 16 mm  D 6 mm  letters as printed on the sheet, not defined there\nDIN 71412 form A, straight (AFT / Kipp K1132, mm)  R1/8  R1/8  A, 0°  11 mm (SW)  L1 16 mm  D 6 mm  letters as printed on the sheet, not defined there\nDIN 71412 form A, straight (AFT / Kipp K1132, mm)  R1/4  R1/4  A, 0°  14 mm (SW)  L1 16 mm  D 6 mm  letters as printed on the sheet, not defined there\nDIN 71412 form B, 45° (AFT / Kipp K1132, mm)  M6x1  M6x1  B, 45°  9 mm (SW)  L max 23 mm  L1 5.5 mm; A 10.5 mm  letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11\nDIN 71412 form B, 45° (AFT / Kipp K1132, mm)  M8x1  M8x1  B, 45°  9 mm (SW)  L max 23 mm  L1 5.5 mm; A 10.5 mm  letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11\nDIN 71412 form B, 45° (AFT / Kipp K1132, mm)  M8x1.25  M8x1.25  B, 45°  9 mm (SW)  L max 23 mm  L1 5.5 mm; A 10.5 mm  letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11\nDIN 71412 form B, 45° (AFT / Kipp K1132, mm)  M10x1  M10x1  B, 45°  11 mm (SW)  L max 23 mm  L1 5.5 mm; A 11.5 mm  letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11\nDIN 71412 form B, 45° (AFT / Kipp K1132, mm)  M10x1.5  M10x1.5  B, 45°  11 mm (SW)  L max 23 mm  L1 5.5 mm; A 11.5 mm  letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11\nDIN 71412 form B, 45° (AFT / Kipp K1132, mm)  R1/8  R1/8  B, 45°  11 mm (SW)  L max 23 mm  L1 5.5 mm; A 11.5 mm  letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11\nDIN 71412 form B, 45° (AFT / Kipp K1132, mm)  R1/4  R1/4  B, 45°  14 mm (SW)  L max 23 mm  L1 5.5 mm; A 12 mm  letters as printed; Wuerth M10 form B: overall 25 mm, thread length 5.5, SW 11\nDIN 71412 form C, 90° (Bollhoff, mm)  M6x1  M6x1  C, 90°  9 mm (s)  14.3 mm (l)  —  Bollhoff steel 5.8 zinc, conical thread\nDIN 71412 form C, 90° (Bollhoff, mm)  M8x1  M8x1  C, 90°  9 mm (s)  14.3 mm (l)  —  Bollhoff steel 5.8 zinc, conical thread\nDIN 71412 form C, 90° (Bollhoff, mm)  M10x1  M10x1  C, 90°  11 mm (s)  15.3 mm (l)  —  Bollhoff steel 5.8 zinc, conical thread\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Alemite: 1/4-28 taper (SAE-LT) hydraulic grease fittings: 1641-B, 1652-B, 1680-B, 1698-B, 3014-B straight, 1637-B1 45 deg, 3010-B1 65 deg, 1911-B1 90 deg: hex, overall length, shank length — web — Maker data sheet; numbers only — https://cdn.shopify.com/s/files/1/1425/8938/files/Alemite-1641-B-Straight-Hydraulic-One-Quarter-Inch-Twenty-Eight-Thread-Grease-Fitting.pdf\n- Alemite: 1/8 PTF hydraulic grease fittings (labelled SAE SPL on the sheet): straight, 30, 45, 65, 90 deg: hex, overall length, shank length — web — Maker data sheet; numbers only — https://cdn.shopify.com/s/files/1/1425/8938/files/Alemite-1688-B-Hydraulics-Forty-Five-Degree-Angle-One-Eighth-Inch-Male-PTF-Grease-Fitting.pdf\n- Alemite: Stainless steel grease fittings 1966-S, 1968-S, 1969-S (1/4-28 taper), 1961-S, 1921-S, 1922-S, 1923-S (1/8 PTF): hex, overall length, shank length — web — Maker data sheet; numbers only — https://cdn.shopify.com/s/files/1/1425/8938/files/Alemite-1961S-StainlessSteel-Straight-Fitting-Grease-Zerk-Hydraulic-Corrosion-Resistant.pdf\n- McMaster-Carr: Grease fittings, 1/4-28 SAE-LT (hex, overall and thread length per fitting) (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/plugs/thread-type~sae-lt\n- AFT / Kipp K1132: Grease nipples, conical head, DIN 71412 style A, straight: M6x1, M8x1, M8x1.25, M10x1, M10x1.5, R1/8, R1/4: D, L1, SW — web — Maker data sheet; numbers only. Letters are not defined on the sheet — https://www.aftfasteners.com/content/K1132-A-Datasheet-18495-Grease-nipples-conical-head-DIN-71412-style-A-straight-enUS.pdf\n- AFT / Kipp K1132: Grease nipples, conical head, DIN 71412 style B, 45 deg: A, thread, L max, L1, SW — web — Maker data sheet; numbers only. Letters are not defined on the sheet — https://www.aftfasteners.com/content/K1132-B-Datasheet-18496-Grease-nipples-conical-head-DIN-71412-style-B-45-hexagonal-enUS.pdf\n- Bollhoff: DIN 71412 C conical grease nipple (form C, 90 deg head position), steel 5.8 zinc-plated: thread, s, pitch, l, M6, M8, M10 — web — Maker data sheet; numbers only — https://eshop-tr.boellhoff.com/out/media/pdf/DIN_71412_C_Stahl_5.8_gv_M___en.pdf\n- Wuerth: Cone grease nipple form B (45 deg) DIN 71412, zinc-plated, M10x1: thread length 5.5, wrench size 11, overall length 25 — web — Maker shop page; numbers only — https://eshop.wuerth.dk/Cone-grease-nipple-shape-B-angled-shape-45-DIN-71412-shape-B-zinc-plated-steel-with-hexagon-NPL-DIN71412-B-H2-A3F-WS11-HEX-M10X1/0986592.sku/en/US/DKK\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=grease-fittings-sae-j534-din-71412\n",
 "sources": [
  {
   "publisher": "Alemite",
   "title": "1/4-28 taper (SAE-LT) hydraulic grease fittings: 1641-B, 1652-B, 1680-B, 1698-B, 3014-B straight, 1637-B1 45 deg, 3010-B1 65 deg, 1911-B1 90 deg: hex, overall length, shank length",
   "url": "https://cdn.shopify.com/s/files/1/1425/8938/files/Alemite-1641-B-Straight-Hydraulic-One-Quarter-Inch-Twenty-Eight-Thread-Grease-Fitting.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker data sheet; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Alemite",
   "title": "1/8 PTF hydraulic grease fittings (labelled SAE SPL on the sheet): straight, 30, 45, 65, 90 deg: hex, overall length, shank length",
   "url": "https://cdn.shopify.com/s/files/1/1425/8938/files/Alemite-1688-B-Hydraulics-Forty-Five-Degree-Angle-One-Eighth-Inch-Male-PTF-Grease-Fitting.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker data sheet; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Alemite",
   "title": "Stainless steel grease fittings 1966-S, 1968-S, 1969-S (1/4-28 taper), 1961-S, 1921-S, 1922-S, 1923-S (1/8 PTF): hex, overall length, shank length",
   "url": "https://cdn.shopify.com/s/files/1/1425/8938/files/Alemite-1961S-StainlessSteel-Straight-Fitting-Grease-Zerk-Hydraulic-Corrosion-Resistant.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker data sheet; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Grease fittings, 1/4-28 SAE-LT (hex, overall and thread length per fitting) (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/plugs/thread-type~sae-lt",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "AFT / Kipp K1132",
   "title": "Grease nipples, conical head, DIN 71412 style A, straight: M6x1, M8x1, M8x1.25, M10x1, M10x1.5, R1/8, R1/4: D, L1, SW",
   "url": "https://www.aftfasteners.com/content/K1132-A-Datasheet-18495-Grease-nipples-conical-head-DIN-71412-style-A-straight-enUS.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker data sheet; numbers only. Letters are not defined on the sheet",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "AFT / Kipp K1132",
   "title": "Grease nipples, conical head, DIN 71412 style B, 45 deg: A, thread, L max, L1, SW",
   "url": "https://www.aftfasteners.com/content/K1132-B-Datasheet-18496-Grease-nipples-conical-head-DIN-71412-style-B-45-hexagonal-enUS.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker data sheet; numbers only. Letters are not defined on the sheet",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Bollhoff",
   "title": "DIN 71412 C conical grease nipple (form C, 90 deg head position), steel 5.8 zinc-plated: thread, s, pitch, l, M6, M8, M10",
   "url": "https://eshop-tr.boellhoff.com/out/media/pdf/DIN_71412_C_Stahl_5.8_gv_M___en.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker data sheet; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wuerth",
   "title": "Cone grease nipple form B (45 deg) DIN 71412, zinc-plated, M10x1: thread length 5.5, wrench size 11, overall length 25",
   "url": "https://eshop.wuerth.dk/Cone-grease-nipple-shape-B-angled-shape-45-DIN-71412-shape-B-zinc-plated-steel-with-hexagon-NPL-DIN71412-B-H2-A3F-WS11-HEX-M10X1/0986592.sku/en/US/DKK",
   "formats": [
    "web"
   ],
   "license": "Maker shop page; 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": [
  "npt-thread-dimensions-asme-b1-20-1",
  "npt-thread-envelopes",
  "pipe-plugs-npt-square-hex-socket",
  "an-jic-37-degree-flare-fittings",
  "forged-threaded-fittings-b16-11",
  "hex-nuts-metric",
  "hex-keys-iso-2936-asme-b18-3"
 ],
 "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 hex size is a standard 1/4-28 zerk fitting?",
   "a": "5/16 in for the straight ones (Alemite 1641-B etc., 35/64 to 1-5/8 in overall) and 3/8 in for the 45°, 65° and 90° ones."
  },
  {
   "q": "What size is an M10x1 grease nipple?",
   "a": "DIN 71412: hex 11 mm for forms A and B (AFT / Kipp) and C (Bollhoff); form A overall L1 is 16 mm on the AFT sheet and form C l is 15.3 mm on Bollhoff's."
  },
  {
   "q": "What is the thread on a 1/8 grease fitting?",
   "a": "1/8 PTF (Dryseal taper) on the Alemite sheets, with a 7/16 in hex for most types; DIN 71412 uses R1/8 (BSPT) with an 11 mm hex."
  }
 ],
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