Screw for fixing roofing sheets and prefabricated metal walls to iron.
sharp-edged, with a hollow collar, designed to house the elastic washer against the infiltration of water.
BS SELF-TAPPING THREAD
with self-tapping grooves, which enable it to be used in thick materials without prior tapping.
CARBONITRIDING HEAT TREATMENT
More info: heat treatment
CHROMITING® GALVANIC TREATMENT
of an iridescent colour, it ensures much more effective protection against rust than all normal galvanizing treatments. Complies with the EN1670 standard grade 4.
More info: finishing treatments