Pin-clutch disc Ø50 × 8 with four Ø6 holes on R16, Ø8 bore — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/pin-clutch-disc-4-holes-50/  (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 50.0, width 50.0, height 8.0
- Ø50 × 8 disc fixed on one shaft with four Ø6 holes on a 16 mm radius: the studs of the sliding disc enter them to lock the two shafts together.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
disc  Ø50 × 8
holes  4 × Ø6 on R16
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. 52: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_052.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/pin-clutch-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/pin-clutch-disc-4-holes-50/index.json
API: https://xemstudio.com/api/geometry?object=pin-clutch-disc-4-holes-50