R-clips (hairpin cotters) for Ø2 to Ø6 pins — dimension sheet Source: Xem Studio, https://xemstudio.com/objects/r-clips/ (CC BY 4.0) Basis: Hairpin R-clip envelopes scaled to the pin Ø: straight leg 6 × pin Ø, loop OD 3.2 × pin Ø, 1.2 wire Catalog version: 2026-10-20 Sizes: see table below - A hairpin clip: one straight leg goes through the pin's cross-hole and the curved leg wraps over the pin to hold it. All four files have a 1.2 mm wire, drawn flat (1.2 thick). - Overall length and loop OD: r-clip-2 14.2 × 6.4; r-clip-3 21.3 × 9.6; r-clip-4 28.4 × 12.8; r-clip-5 35.5 × 16.0. The number in the file name is the smallest pin Ø it is drawn for; each covers that Ø and the next millimetre up. - The 1.2 wire passes cross-holes of Ø1.2 and larger: the Ø5, Ø6 and Ø8 clevis pins (Ø1.2, Ø1.6, Ø2.0 holes). file pin Ø wire Ø length loop OD r-clip-3 2–3 1.2 14.2 6.4 r-clip-3 3–4 1.2 21.3 9.6 r-clip-4 4–5 1.2 28.4 12.8 r-clip-5 5–6 1.2 35.5 16.0 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, 5 parts): https://xemstudio.com/files/hardware/r-clips/index.json API: https://xemstudio.com/api/geometry?object=r-clips