Ball-joint socket: Ø40 body with an R15 hemispherical cup on a Ø12 tube, 3 × Ø2.5 (M3 tap) holes — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/ball-joint-socket-d40-cup-r15/  (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 45.0
- Ø40 × 20 body with a hemispherical R15 cup (the ball's own radius, line on line) and a Ø12 × 25 tube below it, Ø8 bore through; three Ø2.5 holes on a Ø32 circle are tapped M3 for the cap screws.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
body  Ø40 × 20
cup  R15 hemisphere
tube  Ø12 × 25, Ø8 bore
cap holes  3 × Ø2.5 (M3 tap) on Ø32

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. 249: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_249.html
- Xem Studio: drawing — web — Publisher's page; dimensions are facts — https://xemstudio.com/objects/tube-ball-and-socket-joint-mechanism/

Free files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/ball-joint-socket-d40-cup-r15/index.json
API: https://xemstudio.com/api/geometry?object=ball-joint-socket-d40-cup-r15