Specifications for Shoulder Bolts (ISO 7379)

ISO 7379 Technical Drawing

d1 Nom.-681012162024
max5.9907.9879.98711.98415.98419.98023.980
min5.9607.9519.95111.94115.94119.92823.928
d2M5M6M8M10M12M16M20
2IT100.120.120.120.120.140.140.17
d310131618243036
k max.4.55.579111416
t min2.43.34.24.96.68.810
L2 Nom. long/length9.5111316182227
s345681012

The only purpose of having the strength of a property class 12.9 on socket head shoulder screws, is to increase wear resistance on the shoulder.  Due to the undercut between the thread and the shoulder, the tightening torque has to be lowered.

For applications where the shoulder is tightened against the work piece, an even lower torque should be applied.  Preliminary testing is recommended to make sure it fits your application.

*All information is strictly informative