Ball-and-socket joint for tubing — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/tube-ball-and-socket-joint-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)
Basis: Xem Studio design following Brown No. 249 (1868)
Catalog version: 2026-10-20

Sizes: see table below
- One tube ends in a ball with the bore running through it; the other ends in a spherical cup. A ring with a spherical seat is screwed over the ball and holds it in the cup, so the first tube can be swung in any direction about the ball's centre while the bores stay connected.
- Ø30 ball, R15 cup and cap seat (line on line), Ø8 bore; drawn with the ball's tube tilted 15°. M3 cap screws not drawn.
- Brown's No. 249 (ball-and-socket joint for tubing).
- Parts (each has its own page): ball-end-tube-d30-12x8, ball-joint-socket-d40-cup-r15, ball-joint-cap-d40-r15.
- Brown's movement No. 249 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.

parameter  value
ball  Ø30
bore  Ø8
tilt drawn  15°
cap screws  3 × M3

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

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