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
Source: Xem Studio, https://xemstudio.com/objects/pem-self-clinching-studs-fh/  (sheet CC BY 4.0)
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
Catalog version: 2026-10-20

Overall (mm): length 62.6, width 12.1, height 3.0
- 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.

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
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

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- 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
- 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

Free files (CC BY 4.0, Xem Studio; STEP + STL, 2 parts): https://xemstudio.com/files/hardware/pem-self-clinching-studs-fh/index.json
API: https://xemstudio.com/api/geometry?object=pem-self-clinching-studs-fh