Body: Steel, black oxide finish
Hex head of screw hardened
Body: Steel, nickel plated finish
Polyurethane disc, 90 Shore hardness
Hex nut (both versions): Steel, zinc plated, blue passivated
||GN 251 Clamping Screws have a hardened round
head to handle greater clamping forces. A hex jam nut is supplied
for locking the screw in place.
BK type with Polyurethane disk
functions as a dampening element or to protect surfaces.