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PEM self-clinching standoffs (SO, SOS, SOA and blind BSO): hole size, sheet thickness, edge distance, M3–M5 and #4-40 to #10-32 + hole gauges

What hole size and edge distance for a PEM SO self-clinching standoff, and how thin a sheet can it go in? · Standard part · basis: PEM's SO-series data sheet (sodata.pdf) read as text, thread by thread; two hole gauges as files

Also called: pem so standoff hole size, self clinching standoff hole diameter, pem sos 632 hole, pem bso standoff m3, so-440 hole size, self clinching standoff edge distance, pem standoff 6440 hole .213, m3 self clinching standoff hole 4.22, pem standoff stl step, clinch standoff hole gauge

Exact dimensions. Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part. Mating features

length
32.8 mm
width
15.1 mm
height
3.0 mm

Notes

  • Types: SO (steel, sheet hardness HRB 80 / HB 150 or less), SOS (stainless, HRB 70 / HB 125 or less), SOA (aluminium, HRB 50 / HB 82 or less, aluminium only) and SO4 (installs in stainless sheet to HRB 88 / HB 183); BSO, BSOS, BSOA and BSO4 are the blind (threaded one end, closed at the other) versions with the same dimensions (hardness limits as printed in the data sheet). Unthreaded SO standoffs, SOSG, DSO and TSO types exist and are not tabulated.
  • Columns as the data sheet prints them: sheet thickness (read as the minimum sheet the standoff is sized for: .040 / .050 in and 1 / 1.27 mm), minimum hole size B (+.003 / −.000 in; the data sheet lists a minimum only, no separate maximum), the bore diameter in the sheet, the dimension H, the minimum distance from hole centreline to edge D (±.010 in) and the length codes (1/32 in for inch; mm for metric). The PDF text extraction scrambled the columns, so values were assigned by matching them to the metric ones; verify the assignment against PEM's drawing before relying on it. The data sheet also lists a minimum F dimension (.156, .187, .250, .375 in; 3.2, 4, 5, 6.5, 9.5 mm) for the blind type without saying which thread each belongs to; it is not shown.
  • Files are two hole gauges (smallest first; 3 mm plate, 4 mm gaps and margin are Xem choices). The standoff itself is PEM's part (its CAD is on PEM's product pages, not rehosted). Plain threaded standoffs that are not clinched: threaded-standoffs-metric.

PEM self-clinching standoffs (SO, SOS, SOA and blind BSO): hole… size chart

typethread / codesheet thicknessmin hole size Bbore in sheetHmin dist hole C/L to edge Dlength codes
SO / SOS / SOA / SO4 (inch)#4-40 (.112-40), codes 440.040.166.165H .187.234–24 (.125–.750 in)
SO / SOS / SOA / SO4 (inch)6440.040.213.212H .250.274–24
SO / SOS / SOA / SO4 (inch)#6-32 (.138-32), code 632.040.213.212H .250.274–34 (.125–1.062 in)
SO / SOS / SOA / SO4 (inch)8632.050.281.280H .312.314–34
SO / SOS / SOA / SO4 (inch)#8-32 (.164-32), code 832.050.281.280H .312.314–34
SO / SOS / SOA / SO4 (inch)#10-32 (.190-32), code 032.050.281.280H .312.314–34
SO / SOS / SOA / SO4 (metric)M3 x 0.514.224.2H 4.863, 4, 6, 8, 10, 12, 14, 16, 18
SO / SOS / SOA / SO4 (metric)3.5M315.415.39H 6.46.83–18
SO / SOS / SOA / SO4 (metric)M3.5 x 0.615.415.39H 6.46.83–25
SO / SOS / SOA / SO4 (metric)M4 x 0.71.277.147.12H 7.983–25
SO / SOS / SOA / SO4 (metric)M5 x 0.81.277.147.12H 7.983–25
BSO / BSOS / BSOA / BSO4 (inch, blind)#4-40 (.112-40), codes 440.040.166.165H .187.2310–34 (1/32 in codes)
BSO / BSOS / BSOA / BSO4 (inch, blind)6440.040.213.212H .250.2710–34 (1/32 in codes)
BSO / BSOS / BSOA / BSO4 (inch, blind)#6-32 (.138-32), code 632.040.213.212H .250.2710–34 (1/32 in codes)
BSO / BSOS / BSOA / BSO4 (inch, blind)8632.050.281.280H .312.3110–34 (1/32 in codes)
BSO / BSOS / BSOA / BSO4 (inch, blind)#8-32 (.164-32), code 832.050.281.280H .312.3110–34 (1/32 in codes)
BSO / BSOS / BSOA / BSO4 (inch, blind)#10-32 (.190-32), code 032.050.281.280H .312.3110–34 (1/32 in codes)
BSO (metric, blind)M3 x 0.514.224.2H 4.866–25
BSO (metric, blind)3.5M315.415.39H 6.46.86–25
BSO (metric, blind)M3.5 x 0.615.415.39H 6.46.86–25
BSO (metric, blind)M4 x 0.71.277.147.12H 7.986–25
BSO (metric, blind)M5 x 0.81.277.147.12H 7.986–25

Mating features

Drawn at the exact size. Open press, slide, run and socket features by your process's clearance (tolerances by process); leave designed gaps and clamp fits as drawn.

featureexactmates withfitfiles
hole in sheetM3 Ø4.22, M3.5 5.41, M4 / M5 7.14 mm min; #4-40 .166, #6-32 .213, #8-32 / #10-32 .281 inPEM SO / BSO standoff pressed into the sheetpressclinch-hole-gauge-*

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

PennEngineering (PEM)Threaded standoffs types SO, SOS, SOA, SO4 and BSO, BSOS, BSOA, BSO4 (data sheet sodata.pdf): hole size, sheet thickness, distance to edge, lengthswebManufacturer data sheet; dimensions are facts; CAD is PEM's, not hosted
McMaster-CarrPress-fit (self-clinching) nuts (free STEP/IGES per part, for your own design use; no redistribution)STEP, IGES, PDFMcMaster-Carr site terms: personal design use, no redistribution verify

Free files

★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json

clinch-hole-gauge-pem-standoffs-metrichole gauge plate, 32.8 × 15.1 × 3 mm, three holes at PEM's minimum hole size for SO / BSO standoffs: Ø4.22 (M3), 5.41 (M3.5), 7.14 (M4, M5) mm; plate thickness and spacing are Xem choicesSTEP · STL
clinch-hole-gauge-pem-standoffs-inchhole gauge plate, 32.8 × 15.1 × 3 mm, three holes at PEM's hole size for SO / BSO standoffs: .166 (#4-40), .213 (#6-32 and 6440), .281 (#8-32 and #10-32) in; plate thickness and spacing are Xem choicesSTEP · STL
Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
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Plain text: sheet.txt · JSON: /api/geometry?object=pem-self-clinching-standoffs-so-bso

PEM self-clinching standoffs (SO, SOS, SOA and blind BSO): hole size, sheet thickness, edge distance, M3–M5 and #4-40 to #10-32 + hole gauges, isometric render of a generated part
Render of clinch-hole-gauge-pem-standoffs-inch from the free STEP; not to scale.

Fits with

PEM self-clinching nuts (S, CLS, CLSS): hole size, minimum edge distance, nut diameter and height, M2–M12 and #2-56 to 3/8-24 + hole gauges, isometric render of a generated part
PEM self-clinching nuts (S, CLS, CLSS): hole size, minimum edge distance, nut diameter and height, M2–M12 and #2-56 to 3/8-24 + hole gauges98.2×25.0×3.0 mm★ 2 files
PEM self-clinching studs (FH, FHS, FHLS): hole size, minimum sheet thickness, edge distance, #2-56 to #8-32 and M3–M4 + hole gauges, isometric render of a generated part
PEM self-clinching studs (FH, FHS, FHLS): hole size, minimum sheet thickness, edge distance, #2-56 to #8-32 and M3–M4 + hole gauges62.6×12.1×3.0 mm★ 2 files
Threaded standoffs, M2.5 and M3 (hex and round), isometric render of a generated part
Threaded standoffs, M2.5 and M3 (hex and round)2 sizes★ 16 files
Rivet nuts (blind threaded inserts), flat head: hole size, grip range, body and flange dimensions, M3–M12 and #6-32 to 3/8-16, isometric render of a generated part
Rivet nuts (blind threaded inserts), flat head: hole size, grip range, body and flange dimensions, M3–M12 and #6-32 to 3/8-16131.7×32.1×3.0 mm★ 1 file
Heat-set threaded inserts, metric: M2 to M10, standard, short and Voron (CNC Kitchen sizes), isometric render of a generated part
Heat-set threaded inserts, metric: M2 to M10, standard, short and Voron (CNC Kitchen sizes)12 sizes★ 12 files

Questions

What hole for an M3 PEM SO standoff?

4.22 mm minimum hole size, edge distance 6 mm, in 1 mm sheet (data sheet SO / BSO metric table).

What hole for a #6-32 PEM SO standoff?

.213 in minimum (code 632 and 6440), D = .27 in, sheet .040 in.