Universal joint for Ø5 shafts: Ø14 yokes and 8 mm cross spider — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/universal-joint-5mm/  (CC BY 4.0)
Basis: Cardan joint: two yokes on Ø3 cross pins through an 8 × 8 spider; yoke arm gap equals the spider span
Catalog version: 2026-10-20

Sizes: see table below
- Two identical yokes (one file, make two) and one spider. Yoke: Ø14 × 8 hub with a Ø5 bore and a radial Ø2.5 (M3 tap drill) hole 4 mm up, two arms 3 thick × 5 wide rising to 16 overall, 8 mm apart, with a Ø3 cross hole 13 mm from the base.
- Spider: an 8 × 8 × 5 cross of 5 × 5 arms. One Ø3 hole runs straight through on one axis; the other axis has two Ø3 blind holes 2.5 deep, so two short pins stop clear of the through pin.
- The spider's 8 mm span fills the yokes' 8 mm arm gap. A single joint passes rotation through an angle with a once-per-half-turn speed ripple; two joints with their inner yokes in line cancel it.

part  envelope  bore  cross holes  arm gap / span
ujoint-yoke-5mm  Ø14 × 16  Ø5 + M3 tap Ø2.5  Ø3 at 13 from base  8
ujoint-spider-14  8 × 8 × 5  —  Ø3 through + 2 × Ø3 × 2.5 blind  8

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, 2 parts): https://xemstudio.com/files/hardware/universal-joint-5mm/index.json
API: https://xemstudio.com/api/geometry?object=universal-joint-5mm