Ball-ended tube: Ø30 ball on a Ø12 tube, Ø8 bore through — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/ball-end-tube-d30-12x8/  (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 30.0, width 30.0, height 59.46
- Ø30 ball with a Ø12 tube 45 mm long coming out of it, Ø8 bore through both: it seats in the spherical cup of the socket and can swing in any direction while the bore stays connected.
- Xem Studio design following Brown's figure; true size, no printing allowance (apply your own to the mating features).

dimension  value
ball  Ø30
tube  Ø12 × 45 from the ball centre
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. 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-end-tube-d30-12x8/index.json
API: https://xemstudio.com/api/geometry?object=ball-end-tube-d30-12x8