Material: Steel C45, black oxide finish. Screw steel 12.9.

Typ B1: With two axial mounting bores.
Typ B2: With two
axial mounting bores, with sunk holes for cylindrical cap screws DIN 912.

The
thread of the screw DIN 912 is covered with a layer of polyamide.
Tolerance
b: +0.08mm / -0.25mm. Temperature range: -40ºC to +175ºC.

^* Fitting screw size for B1.
^** Fitting screw
size for B2.

Features: does not damage the shaft, stronger clamping force than
with set collars, even distribution of clamping forces, easy
readjustment, precision honed bores.

Remarks to collars from steel: The black oxide on the clamping
collars is formulated as part of the total performance of the product.
It
enhances the holding ability of the collar, it efficiently reduces
slipping on the shaft, has anti-stick-slip characteristics and helps to
keep the torque rating of the screw within its designed parameters. The
oxide layer also provides corrosion protection.