Clevis pins, R-clips, cotter pins, clevises, universal joint, rod ends (heim joints) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/pins-clevises-and-joints/  (CC BY 4.0)
Basis: ISO 2341 clevis pins, DIN 11024 R-clips, common rod-end (POS/PHS series) ball sizes; printed clevises and a universal joint sized to Ø3/Ø5 pins
Catalog version: 2026-10-20

Sizes: see table below
- Clevis pin: plain shank with a head and a cross-hole; Ø3 × 12–20, Ø5 × 20–30, Ø8 × 40 cover model work. Printed hole Ø+0.2 for a pivot, Ø−0.05 press in the fixed side. R-clip (hairpin) sizes by pin: 2–3 mm pin → size 2; 4–5 → size 3–4; 6–8 → size 5. Cotter pins (split pins) Ø1.6 × 16 and Ø2 × 20 for the same holes.
- Clevis: fork with a pin across the gap; gap = link thickness + 0.4. The printed ones take an M3 pushrod in the shank. A clevis + pin + R-clip is the field-serviceable joint: no tools.
- Universal joint: two yokes and a cross spider on Ø3 pins; transmits rotation across up to 25° with velocity ripple (use two, phased, for constant velocity). Ø14 printed yokes on Ø5 shafts.
- Rod ends (heim joints): M3 (ball Ø6), M4 (Ø8), M5 (Ø10), M6 (Ø12), M8 (Ø16) threaded shank, ±13° misalignment; the envelopes here are for fit; buy the steel part (POSA/PHSA series). Male on the rod, female (PHS) takes a bolt through the ball.

part  sizes  mating hole  note
clevis pin  Ø3, 4, 5, 6, 8 × 12–40  Ø + 0.2 pivot / − 0.05 press  ISO 2341
R-clip  sizes 2–5  cross-hole Ø1–1.6  DIN 11024
cotter pin  Ø1.6 × 16, Ø2 × 20  Ø1.8 / 2.2  ISO 1234
clevis (printed)  Ø3 pin gap 5/8, Ø5 gap 8/10, Ø6 gap 12  M3 shank  —
universal joint  Ø14 yokes, Ø5 shafts  Ø3 cross pins  25° max
rod end  M3–M8, ball Ø6–16  bolt through ball  POS/PHS series

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Clevis fastener — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Clevis_fastener
- Wikipedia: Universal joint — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Universal_joint
- Wikipedia: Rod end bearing — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Rod_end_bearing
- McMaster-Carr: Clevis pins (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/clevis-pins/
- McMaster-Carr: Rod ends (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/ball-joint-rod-ends/
- Long Earth Society: Engine and rig builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 23 parts): https://xemstudio.com/files/hardware/pins-clevises-and-joints/index.json
API: https://xemstudio.com/api/geometry?object=pins-clevises-and-joints