Oldham coupling (parallel-offset shaft coupling) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/oldham-coupling/  (CC BY 4.0)
Basis: Xem Studio drawing; classic mechanism
Catalog version: 2026-10-20

Sizes: see table below
- Two hubs with face tongues at 90° to each other and a centre disc slotted on both faces: the disc slides on both tongues, so shafts that are parallel but offset turn together.
- Speed is exactly 1:1 (no cyclic error, unlike a universal joint); the disc centre orbits at twice shaft speed with a radius of half the offset.
- Common on 3D-printer Z lead screws and pumps.
- Parts (each has its own page): oldham-coupling-hub-40, oldham-coupling-disc-40, shaft-couplers.

parameter  value
diameter  40 mm
max offset  ≈2 mm for this size
bores  Ø5

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/oldham-coupling/index.json
API: https://xemstudio.com/api/geometry?object=oldham-coupling