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Ball Socket Dimensions (DIN 71805, Ball 8 to 19 mm)
Guide · Updated October 28, 2026
DIN 71805 covers ball sockets, form A with snap ring and form B with safety clip groove, ball 8 to 19 mm. Values agree across Leitner, Bonnekamp (Tracsa), Powertrans and Fusco tables; the one disagreement is dashed.
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Step by step
- Pick the ball size: d1 must match the DIN 71803 ball stud, e.g. 13 mm.
- Pick the thread: d2 is the rod thread, right or left hand, e.g. M8.
- Check the length: a is overall socket length and e the min thread depth.
- Pick the form: A has a snap ring; B adds a hole and groove for a safety clip at l2.
DIN 71805 ball socket dimensions (mm)
Columns: ball d1, thread d2, length a, d3, body d4, thread depth e min, l1, form B clip position l2.
- d1 | d2 | a | d3 | d4 | e min | l1 | l2
- 8 | M5 | 22 | 8 | 12.8 | 10.2 | 15 | 6.3
- 10 | M6 | 25 | 10 | 14.8 | 11.5 | 17 | 7
- 13 | M8 | 30 | 13 | 19.3 | 14 | 20 | 9.1
- 16 | M10, M12 | 35 | 16 | 24 | — | 22 | 11.4
- 19 | M14x1.5, M14, M16 | 45 | 22 | 30 | 21.5 | 28 | 12.5
Worked example: 13 mm socket on M8
A DIN 71805 B13 M8 socket is 30 mm long with a 19.3 mm body and at least 14 mm of M8 thread. It fits a 13 mm DIN 71803 ball stud.
Common problems
- Ball pops out: use form B with a safety clip.
- Wrong ball size: d1 must match the stud.
- Rod bottoms out: keep rod thread shorter than e min.
FAQ
What is DIN 71805 used for?
The socket half of a DIN 71802 angled ball joint, used on linkages, gas springs and control rods.
Why is e at 16 mm dashed?
Leitner gives 16 mm, while Bonnekamp, Powertrans and Fusco give 15.5 mm, so the cell is left blank.
Is there a long version?
Yes, Gebert sells a long form B (e.g. a 45 mm at 13 mm ball); only one source lists it, so it is not charted.
Can I use left hand thread?
Yes, most suppliers offer d2 in left hand for turnbuckle adjustment.
Related guides and calculators
- Ball studs (DIN 71803)
- Angled ball joints (DIN 71802)
- Clevis forks (DIN 71752)
- Jam nuts (ISO 4035)
- All free machinist calculators
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