Ball joints are mechanical units for the connection of 2 parts which are perpendicular with respect to each other. They enable the transmission of alternating forces through angular and oscillating movements, at a moderate speed.

DIN 71802
Ball joints:
a) Form C: Iwithout safety clip S and therefore without its external slot and the two holes for the clip itself
b) Form CS: with safety clip S mounted in the slot and the two holes of the housing.
According to the standard, the nuts are supplied separately

DIN 71805
Ball Socket
a) Form A: without slot and holes for the safety clip and with the mounted snap ring R
b) Form B: with external slot and holes for the safety clip S and with the internal snap ring R

DIN 71803 Ball Stud
a) Form C: con filettatura
b) Form B: without thread, to rivet

The ball sockets DIN 71805 produced and supplied by Chiavette Unficate have been improved by the spanner’s execution. Upon request, they could be also supplied without spanner surface All our products could be supplied with electrolytic coatings according to the standards stated at page 6 and/ or unfinished .



Ball stud: carbon steel with 60 daN/mm2 resistance to tensile stress and inner ring hardened on the surface with hardness ≥ 52 HRC in alternative (1.4305 - AISI 303)

Ball socket: steel 11SMnPb30 with a 50 daN/mm² resistance to tensile stress (1.0718) in alternative (1.4305 - AISI 303)

Springs: steel for springs C98 UNI EN 10270-1 DH in alternative (1.4319 - AISI 302)

Lubrification: spherical coupling oiled during assembly with LITHIUM grease, NLGI 1 grade

Nuts: see table at page 67

Extraction and Insertion force BALL STUD - BALL SOCKE

The load values requested for the extraction and insertion of the ball stud from/to the ball socket’s housing with the mounted “R” spring, with the joint free from grease, are indicated in the following table:

Sliding moment

In the male-female coupling (with grease), the male in a horizontal position falls with a force F applied to the extremity of the male thread (see diagram), according to the table below:

Permissible load and tightening torque

The maximum permissible load for the angular joint is given in the following table; it is also important to tighten the nut as indicated:
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