Hexagon Head with Washer - For Light Steel 1.2-3.5mm - Full Thread - Self Drilling Screws

Hexagon head screws with self-drilling point and bonded EPDM 

washer for fixing roofing and cladding to cold rolled purlins. 

Coarse thread and TEK 3 point suitable for steel thicknesses from 

1.2 – 3.5mm. Tough three-stage zinc-ceramic coating for superior 

corrosion resistance.

Installation

1. Screws should be installed using a Tek screwdriver or cordless 

drill with adequate power and a drilling speed of between 1500 

– 2500 rpm. (IMPORTANT - Impact screwdrivers will damage 

the threads and must not be used)

2. Use a 5/16" socket to install the screw perpendicularly into the 

steel maintaining steady pressure without forcing the tool. 

3. Stop inserting the screw as soon as the compression disc of the 

bonded washer changes from convex to flat. Overtightening the 

screw is liable to damage the thread particularly in thin steel.