Split eccentric strap for Ø30 sheaves, 51 mm to the eye — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/eccentric-strap/  (CC BY 4.0)
Basis: Ring Ø30 bore × Ø40 OD × 8 with a 1 mm split and a 40 × 10 arm ending in a Ø3 eye
Catalog version: 2026-10-20

Sizes: see table below
- A ring Ø30 bore × Ø40 OD × 8 with a 1 mm split through the side opposite the arm, so it goes over the sheave without taking the shaft apart.
- A 40 × 10 arm ends in a Ø3 eye 51 mm from the ring's centre. Overall 75 × 40 × 8.
- The Ø30 bore turns on the sheave and a Ø3 pin in the eye drives the next link; fits are under Mating features.

feature  value_mm
bore  Ø30
ring OD  Ø40
thickness  8
split  1.0
arm  40 × 10
eye  Ø3 at 51
overall  75 × 40 × 8

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Eccentric (mechanism) — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Eccentric_(mechanism)
- Long Earth Society: Engine and rig builds on extrusion frames — web, video — LES site — https://longearthsociety.com/engineering/

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