{
 "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": "pem-self-clinching-studs-fh",
 "name": "PEM self-clinching studs (FH, FHS, FHLS): hole size, minimum sheet thickness, edge distance, #2-56 to #8-32 and M3–M4 + hole gauges",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What hole size and sheet thickness for a PEM FH flush-head stud, and how far from the edge?",
 "tags": [
  "self clinching stud",
  "pem fh stud",
  "flush head stud",
  "press in stud",
  "sheet metal stud",
  "fastener"
 ],
 "aliases": [
  "pem fh stud hole size",
  "self clinching stud hole diameter 6-32",
  "fh-632 stud hole .137",
  "pem fhs m4 hole",
  "self clinching stud edge distance",
  "pem stud minimum sheet thickness",
  "fh-440 stud hole .111",
  "pem fh stud stl step",
  "clinch stud hole gauge",
  "m3 self clinching stud hole 3 mm"
 ],
 "overall_mm": {
  "length": 62.6,
  "width": 12.1,
  "height": 3
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 2,
 "url": "https://xemstudio.com/objects/pem-self-clinching-studs-fh/",
 "sheet_txt": "https://xemstudio.com/objects/pem-self-clinching-studs-fh/sheet.txt",
 "sheet": {
  "basis": "PEM's FH / FHS / FHA compare table (unified, length code 4 and 5) and the FHS-M3-8, FHS-M4-8 and FHLS-M4-6 part pages; two hole gauges as files",
  "overall_mm": {
   "length": 62.6,
   "width": 12.1,
   "height": 3
  },
  "notes": [
   "Unified rows are from PEM's comparison table (all four sizes, length code 4 = .250 in; the #2-56 also in code 5 = .312 in): minimum sheet thickness .040 in, hole size in sheet (+.003 / −.000 in), maximum hole in attached parts, H (±.015 in; the page does not define it, probably the head diameter), S max (thread gauge note), minimum distance hole C/L to edge, for sheet hardness HRB 80 / HB 150 or less. Fastener material heat-treated carbon steel; zinc plated per ASTM B633. Thread spec: external, ANSI B1.1, 2A.",
   "Metric rows are the three part pages read, in mm: minimum sheet thickness 1.00 mm, hole size (+0.08 mm), maximum hole in attached parts, H (±0.4), S max, minimum distance hole centreline to edge, hardness HRB 70 / HB 125 or less, 300-series stainless, thread 6g. H is not defined on the pages; one page (FHS-M4-8) labels it 'head height' in its table summary but the label is not confirmed on the part page. Only M3 and M4 were read: other FH / FHS metric sizes and length codes are not tabulated. The low-displacement FHLS-M4-6 is a different head: its H and edge distance differ from FHS-M4-8 (4.65 and 4.3 against 5.9 and 7.2 mm).",
   "The studs are threaded: for unthreaded FH pins see PEM's separate catalog pages (not read). Files are two hole gauges (3 mm thick chains of round pads, Xem's choices) with the published hole sizes. The stud is PEM's part; its CAD is on PEM's pages, not rehosted. McMaster-Carr sells FH studs (it files each as a part page, e.g. FH-632-12); linked, not copied."
  ],
  "table": {
   "columns": [
    "type",
    "thread / code",
    "min sheet thickness",
    "hole size in sheet",
    "max hole in attached parts",
    "H",
    "S max",
    "min dist hole C/L to edge",
    "length"
   ],
   "rows": [
    [
     "FH (unified, in)",
     "#2-56 (.086-56), code 256",
     ".040",
     ".085",
     ".105",
     ".144",
     ".075",
     ".187",
     ".250 (L4) / .312 (L5)"
    ],
    [
     "FH (unified, in)",
     "#4-40 (.112-40), code 440",
     ".040",
     ".111",
     ".135",
     ".176",
     ".085",
     ".219",
     ".250 (L4)"
    ],
    [
     "FH (unified, in)",
     "#6-32 (.138-32), code 632",
     ".040",
     ".137",
     ".160",
     ".206",
     ".090",
     ".250",
     ".250 (L4)"
    ],
    [
     "FH (unified, in)",
     "#8-32 (.164-32), code 832",
     ".040",
     ".163",
     ".185",
     ".237",
     ".090",
     ".281",
     ".250 (L4)"
    ],
    [
     "FHS / FHLS (metric, mm)",
     "FHS-M3-8",
     "1.00",
     "3.0",
     "3.60",
     "4.6",
     "2.1",
     "5.6",
     "8"
    ],
    [
     "FHS / FHLS (metric, mm)",
     "FHS-M4-8",
     "1.00",
     "4.0",
     "4.60",
     "5.9",
     "2.40",
     "7.2",
     "8"
    ],
    [
     "FHS / FHLS (metric, mm)",
     "FHLS-M4-6 (low displacement)",
     "1.00",
     "4.0",
     "4.40",
     "4.65",
     "2.40",
     "4.3",
     "6"
    ]
   ]
  }
 },
 "sheet_text": "PEM self-clinching studs (FH, FHS, FHLS): hole size, minimum sheet thickness, edge distance, #2-56 to #8-32 and M3–M4 + hole gauges — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/pem-self-clinching-studs-fh/  (sheet CC BY 4.0)\nBasis: PEM's FH / FHS / FHA compare table (unified, length code 4 and 5) and the FHS-M3-8, FHS-M4-8 and FHLS-M4-6 part pages; two hole gauges as files\nCatalog version: 2026-10-20\n\nOverall (mm): length 62.6, width 12.1, height 3.0\n- Unified rows are from PEM's comparison table (all four sizes, length code 4 = .250 in; the #2-56 also in code 5 = .312 in): minimum sheet thickness .040 in, hole size in sheet (+.003 / −.000 in), maximum hole in attached parts, H (±.015 in; the page does not define it, probably the head diameter), S max (thread gauge note), minimum distance hole C/L to edge, for sheet hardness HRB 80 / HB 150 or less. Fastener material heat-treated carbon steel; zinc plated per ASTM B633. Thread spec: external, ANSI B1.1, 2A.\n- Metric rows are the three part pages read, in mm: minimum sheet thickness 1.00 mm, hole size (+0.08 mm), maximum hole in attached parts, H (±0.4), S max, minimum distance hole centreline to edge, hardness HRB 70 / HB 125 or less, 300-series stainless, thread 6g. H is not defined on the pages; one page (FHS-M4-8) labels it 'head height' in its table summary but the label is not confirmed on the part page. Only M3 and M4 were read: other FH / FHS metric sizes and length codes are not tabulated. The low-displacement FHLS-M4-6 is a different head: its H and edge distance differ from FHS-M4-8 (4.65 and 4.3 against 5.9 and 7.2 mm).\n- The studs are threaded: for unthreaded FH pins see PEM's separate catalog pages (not read). Files are two hole gauges (3 mm thick chains of round pads, Xem's choices) with the published hole sizes. The stud is PEM's part; its CAD is on PEM's pages, not rehosted. McMaster-Carr sells FH studs (it files each as a part page, e.g. FH-632-12); linked, not copied.\n\ntype  thread / code  min sheet thickness  hole size in sheet  max hole in attached parts  H  S max  min dist hole C/L to edge  length\nFH (unified, in)  #2-56 (.086-56), code 256  .040  .085  .105  .144  .075  .187  .250 (L4) / .312 (L5)\nFH (unified, in)  #4-40 (.112-40), code 440  .040  .111  .135  .176  .085  .219  .250 (L4)\nFH (unified, in)  #6-32 (.138-32), code 632  .040  .137  .160  .206  .090  .250  .250 (L4)\nFH (unified, in)  #8-32 (.164-32), code 832  .040  .163  .185  .237  .090  .281  .250 (L4)\nFHS / FHLS (metric, mm)  FHS-M3-8  1.00  3.0  3.60  4.6  2.1  5.6  8\nFHS / FHLS (metric, mm)  FHS-M4-8  1.00  4.0  4.60  5.9  2.40  7.2  8\nFHS / FHLS (metric, mm)  FHLS-M4-6 (low displacement)  1.00  4.0  4.40  4.65  2.40  4.3  6\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- PennEngineering (PEM): Flush-head threaded studs FH, FHS, FHA (unified compare table) and FHS-M3-8, FHS-M4-8, FHLS-M4-6 part pages — web — Manufacturer catalog; dimensions are facts; CAD is PEM's, not hosted — https://catalog.pemnet.com/ko/printcompare/flush-head-threaded-studs-types-fh-fha-fhs/f-clinching-threaded-studs-type-fh-fhs-fha-unified\n- McMaster-Carr: Self-clinching stud FH-632-12 (flush head studs; see parent category) (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://mcmaster.com/products/fh-632-12-studs\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/pem-self-clinching-studs-fh/index.json\nAPI: https://xemstudio.com/api/geometry?object=pem-self-clinching-studs-fh\n",
 "sources": [
  {
   "publisher": "PennEngineering (PEM)",
   "title": "Flush-head threaded studs FH, FHS, FHA (unified compare table) and FHS-M3-8, FHS-M4-8, FHLS-M4-6 part pages",
   "url": "https://catalog.pemnet.com/ko/printcompare/flush-head-threaded-studs-types-fh-fha-fhs/f-clinching-threaded-studs-type-fh-fhs-fha-unified",
   "formats": [
    "web"
   ],
   "license": "Manufacturer catalog; dimensions are facts; CAD is PEM's, not hosted",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Self-clinching stud FH-632-12 (flush head studs; see parent category) (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://mcmaster.com/products/fh-632-12-studs",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "pem-self-clinching-nuts-s-cls",
  "pem-self-clinching-standoffs-so-bso",
  "shoulder-screws-iso-7379",
  "rivet-nuts-flat-head",
  "threaded-rod-metric-din-976"
 ],
 "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": [
  {
   "feature": "hole in sheet",
   "exact": "FH #2-56 .085, #4-40 .111, #6-32 .137, #8-32 .163 in (+.003 / −.000); FHS M3 Ø3.0, M4 Ø4.0 mm (+0.08)",
   "mates": "PEM FH / FHS stud pressed into the sheet",
   "fit": "press",
   "files": "clinch-hole-gauge-"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. ISO 286 equivalent: H7/g6 or H7/h6.",
  "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "What hole for a #6-32 PEM FH stud?",
   "a": ".137 in (+.003 / −.000), minimum sheet .040 in, hole centre at least .250 in from the edge (compare table, length code 4)."
  },
  {
   "q": "What hole for an M4 PEM FHS stud?",
   "a": "4.0 mm (+0.08), sheet 1 mm minimum, edge distance 7.2 mm for FHS-M4-8 (4.3 mm for the low-displacement FHLS-M4-6)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "clinch-hole-gauge-pem-fh-studs-inch",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/pem-self-clinching-studs-fh/clinch-hole-gauge-pem-fh-studs-inch.step",
   "stl": "https://xemstudio.com/files/hardware/pem-self-clinching-studs-fh/clinch-hole-gauge-pem-fh-studs-inch.stl",
   "note": "hole gauge chain, 62.6 × 12.1 × 3 mm, four holes at PEM's hole size in sheet for FH studs: .085 (#2-56), .111 (#4-40), .137 (#6-32), .163 (#8-32) in, nominal = lower limit of +.003 / −.000 in, as a chain of round pads (4 mm ring round each hole) joined by a 6 mm bar; thickness and spacing are Xem choices"
  },
  {
   "file": "clinch-hole-gauge-pem-fhs-studs-metric",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/pem-self-clinching-studs-fh/clinch-hole-gauge-pem-fhs-studs-metric.step",
   "stl": "https://xemstudio.com/files/hardware/pem-self-clinching-studs-fh/clinch-hole-gauge-pem-fhs-studs-metric.stl",
   "note": "hole gauge chain, 29.0 × 12.0 × 3 mm, two holes at PEM's hole size in sheet for FHS / FHLS metric studs: Ø3.0 (M3) and Ø4.0 (M4) mm, nominal = lower limit of +0.08 mm, round pads (4 mm ring) joined by a 6 mm bar; thickness and spacing are Xem choices"
  }
 ],
 "markdown": "https://xemstudio.com/objects/pem-self-clinching-studs-fh/index.md"
}