Pawl 24 mm with a Ø3 pivot for the Ø40 ratchet wheels — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/ratchet-pawl/  (CC BY 4.0)
Basis: Pawl 24 mm from pivot to tip, 8 wide, 6 thick, Ø10 boss with a Ø3 pivot hole
Catalog version: 2026-10-20

Sizes: see table below
- A flat pawl 6 thick: a Ø10 boss with a Ø3 pivot hole, an 8 mm wide arm and a pointed tip 24 mm from the pivot. Overall 29 × 10 × 6.
- It turns on a Ø3 pin; the tip locks against a tooth face and the sloped tooth backs lift it on the free stroke.
- Its contact point trails the pivot in the locking direction so load drives it into the tooth; a spring holds it down (not drawn).

feature  value_mm
pivot to tip  24
arm width  8
thickness  6
pivot boss  Ø10
pivot hole  Ø3
overall  29 × 10 × 6

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Ratchet (device) — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Ratchet_(device)
- Wikipedia: Pawl — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Pawl
- Long Earth Society: Engine builds that use these parts (videos and write-ups) — 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/ratchet-pawl/index.json
API: https://xemstudio.com/api/geometry?object=ratchet-pawl