Split pins (cotter pins) ISO 1234 / DIN 94, 0.6–20: hole size, wire diameter d, a, b, c and the bolt and clevis-pin size each one serves — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/split-pins-iso-1234/ (sheet CC BY 4.0) Basis: Westfield Fasteners' DIN 94 sheet (nominal 0.6 to 20 mm, d, a, b, c, plus the pin and bolt ranges per size), roymech's DIN 94 / ISO 1234 / BS 1574 table (agrees on every value it prints); numbers only Catalog version: 2026-10-20 Sizes: see table below - Split pins (cotter pins) are sized by the hole they fit: the nominal size equals the hole diameter (Westfield: 'cotter pin holes match the nominal diameter'). Columns in mm: nominal size = hole, d (the wire section, max / min), a (the prong extension, max / min), b (eye length), c (eye outside, min / max), the length range roymech lists (l), the bolt diameter range the size serves (over x up to y) and the clevis-pin diameter range, and v min as printed in Westfield's application table (it does not define v). Westfield's sheet names DIN 94; roymech names DIN 94, ISO 1234 and BS 1574 together; the ISO 1234 text itself was not read, so the ISO match rests on roymech's statement and on identical d, a, b and c in the two tables. - roymech does not list 0.6 and 16 mm and has no bolt ranges; where both print a value (0.8 to 13 mm) d max, a max, b and c agree. roymech's 8 mm row prints c max as '15,' (incomplete) and Westfield 15; the Westfield value is shown. Length tolerance on the shank (Westfield, DIN 94): 4 to 6 mm ±0.6, 8 to 10 ±0.75, 12 to 18 ±0.9, 20 to 28 ±1.0, 32 to 50 ±1.25, 56 to 80 ±1.5, 90 to 112 ±1.75, 125 to 180 ±2.0, 200 to 250 ±2.3, 280 ±2.6 mm. - Use: a split pin goes through a cross hole in a clevis pin, bolt or shaft and its two halves are bent apart. Pick the size from the clevis pin's hole (ISO 2341 form B: d1 per size on clevis-pins-iso-2341). The ranges in the table are Westfield's application table; for clevis pins they match ISO 2341's hole for all 26 sizes (d 3 to 100). ISO 2341 also says to use the next larger pin and hole where alternating transverse forces act (iTeh's page for ISO 2341). - No file: the pin is two half-round wires with a rolled eye; the cross-section and the eye form are not published as numbers in the sources read. Hairpin-style R-clips: r-clips-hairpin-cotters-din-11024. The existing page pins-clevises-and-joints lists a few model-work sizes. nominal size = hole (mm) d max / min a max / min b c min / max length range l (roymech) bolt d range, over to up to (mm) clevis pin d range, over to up to (mm) v min 0.6 0.5 / 0.4 1.6 / 0.8 2 0.9 / 1 — — to 2.5 — to 2 3 0.8 0.7 / 0.6 1.6 / 0.8 2.4 1.2 / 1.4 6–12 2.5 to 3.5 2 to 3 3 1 0.9 / 0.8 1.6 / 0.8 3 1.6 / 1.8 6–12 3.5 to 4.5 3 to 4 4 1.2 1 / 0.9 2.5 / 1.25 3 1.7 / 2 6–40 4.5 to 5.5 4 to 5 5 1.6 1.4 / 1.3 2.5 / 1.25 3.2 2.4 / 2.8 6–40 5.5 to 7 5 to 6 5 2 1.8 / 1.7 2.5 / 1.25 4 3.2 / 3.6 6–50 7 to 9 6 to 8 6 2.5 2.3 / 2.1 2.5 / 1.25 5 4 / 4.6 8–50 9 to 11 8 to 9 6 3.2 2.9 / 2.7 3.2 / 1.6 6.4 5.1 / 5.8 8–63 11 to 14 9 to 12 8 4 3.7 / 3.5 4 / 2 8 6.5 / 7.4 16–100 14 to 20 12 to 17 8 5 4.6 / 4.4 4 / 2 10 8 / 9.2 20–100 20 to 27 17 to 23 10 6.3 5.9 / 5.7 4 / 2 12.6 10.3 / 11.8 25–125 27 to 39 23 to 29 12 8 7.5 / 7.3 4 / 2 16 13.1 / 15 40–140 39 to 56 29 to 44 14 10 9.5 / 9.3 6.3 / 3.2 20 16.6 / 19 50–140 56 to 80 44 to 69 16 13 12.4 / 12.1 6.3 / 3.2 26 21.7 / 24.8 71–140 80 to 120 69 to 110 20 16 15.4 / 15.1 6.3 / 3.2 26 21.7 / 24.8 — 120 to 170 110 to 160 25 20 19.3 / 19 6.3 / 3.2 40 33.8 / 38.6 — 170 to — 160 to — 32 Files elsewhere (not hosted by Xem Studio; license as stated by the publisher): - Westfield Fasteners: DIN 94 split (cotter) pins, nominal 0.6 to 20: d max / min, a max / min, b, c min / max, length tolerances, bolt and clevis-pin ranges per size with v min — web — Reference page; numbers only — https://westfieldfasteners.co.uk/Standards/Pin-Cotter.pdf - roymech: Split cotter pins (DIN 94 / ISO 1234 / BS 1574): nominal size = hole, d, a, b, c and length range l — web — Reference page; numbers only — https://roymech.org/Useful_Tables/Circlips/Split_Cotter_Pins.html - ISO: ISO 1234:1976: Split pins, metric series (title as listed by ISO) (standard body catalogue page; the standard itself is paid) — web — Standard body catalogue page — https://www.iso.org/ics/21.060.50.html No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned. API: https://xemstudio.com/api/geometry?object=split-pins-iso-1234