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MK MATERIAL
Gas Springs & End Fittings
Ball Joint DIN 71802 with Ball Stud Form C – Type BJ2
BJ2 combines a ball socket with a threaded ball stud in form C, featuring spanner flats for tightening. The joint allows angular movement between connected components in gas spring assemblies and other mechanical applications.
The ball socket connects through its female thread, while the ball stud provides a male threaded connection. BJ2 ball joints are supplied with an internal retaining ring and, depending on the variant, an additional safety catch to retain the ball stud in the socket. A nut for the ball stud thread can be supplied on request.
The BJ2 range includes variants with standard DIN 71802 dimensions, as well as selected dimensional variants outside the DIN range. The available configurations differ in ball diameter, socket and stud thread sizes, installation dimensions and widths across flats.
BJ2 Ball Joint DIN 71802 – Dimensions and Variants
The dimensional table lists the available BJ2 product codes, ball diameters, socket and stud threads, installation dimensions and widths across flats. The corresponding technical drawings show the dimensions and construction of each variant.
Products marked with an asterisk (*) are manufactured to order. Unmarked products belong to our standard product offering, which includes both DIN 71802 dimensional variants and selected dimensions outside the standard. The asterisk indicates made-to-order availability, not dimensional conformity with DIN 71802.
When selecting a variant, check both thread sizes and the installation dimensions, as these may differ between products with the same ball diameter. The spanner flats on the form C ball stud provide the tightening surfaces; their width is indicated by SW in the table and drawings.
| Code |
Drawing |
d1 |
a |
Thread (m1) |
l1 |
Thread (m2) |
SW |
|---|---|---|---|---|---|---|---|
| BJ206224.84 |
6 |
22 |
M4 |
8 |
M4 |
5 |
|
| BJ208225.105 |
8 |
22 |
M5 |
10.2 |
M5 |
7 |
|
| BJ208225.106* |
8 |
22 |
M5 |
10.2 |
M6 |
7 |
|
| BJ210188.128* |
10 |
18 |
M8 |
12 |
M8 |
11 |
|
| BJ210255.126* |
10 |
25 |
M5 |
12.5 |
M6 |
8 |
|
| BJ210256.126 |
10 |
25 |
M6 |
12.5 |
M6 |
8 |
|
| BJ213258.168* |
13 |
25 |
M8 |
16.5 |
M8 |
11 |
|
| BJ213306.158* |
13 |
30 |
M6 |
15 |
M8 |
11 |
|
| BJ213308.168 |
13 |
30 |
M8 |
16.5 |
M8 |
11 |
|
| BJ216350.200 |
16 |
35 |
M10 |
20 |
M10 |
13 |
|
| BJ219454.284 |
19 |
45 |
M14 |
28 |
M14 |
16 |
* Manufactured to order.
All dimensions in mm.
Materials and Available Versions
Standard BJ2 ball joints are manufactured from 11SMnPb30 steel with a white zinc-plated finish. Stainless steel versions are available on request.
Versions with non-standard dimensions, fine-pitch threads, left-hand threads or alternative surface finishes can be evaluated according to the application requirements.
Need Help Selecting or Customizing a BJ2 Ball Joint?
If you are unsure which BJ2 variant is suitable for your application, send us the required ball diameter, socket and stud thread sizes, installation dimensions, preferred material and quantity. Please indicate whether a nut is required for the ball stud thread.
MK Gas Springs also manufactures custom products beyond the variants shown in the catalogue. Send us a drawing, photo, dimensions and application requirements so that our team can help identify a suitable standard product or assess the feasibility of a custom solution.