Bayonet tube Ø20 × Ø14 × 70 with two Ø3 stud holes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/bayonet-tube-20x14-studs-3/  (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 20.0, width 20.0, height 70.0
- Ø20 tube (Ø14 bore), 70 long, with two Ø3 radial holes opposite each other 8 mm from its end for the studs (Ø3 × 10 dowels standing 7 mm proud of the tube).
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
tube  Ø20 × Ø14 × 70
studs  2 × Ø3 × 10, 8 mm from the end

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. 245: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_245.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/bayonet-joint-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/bayonet-tube-20x14-studs-3/index.json
API: https://xemstudio.com/api/geometry?object=bayonet-tube-20x14-studs-3