Anti-friction wheel Ø40 × 10, Ø8 bore — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/anti-friction-wheel-40x10-bore8/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown's figure (1868); true size, no printing allowance
Catalog version: 2026-10-20

Overall (mm): length 40.0, width 40.0, height 10.0
- Plain Ø40 × 10 wheel on a Ø8 axle: two of them, 44 mm apart, carry a shaft on their rims, so the shaft rolls on the wheels instead of sliding in a bearing.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
wheel  Ø40 × 10
bore  Ø8

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala
- 507movements.com: Brown's movement No. 250: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_250.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/anti-friction-wheel-bearing-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/anti-friction-wheel-40x10-bore8/index.json
API: https://xemstudio.com/api/geometry?object=anti-friction-wheel-40x10-bore8