Hexagon Head - For Heavy Steel 4.0-12.5mm with Bonded Washer - Part Thread - Self Drilling Screws

Hexagon head screws with self-drilling point and bonded EPDM 

washer for fixing composite roofing and cladding panels to structural 

steel. Fine thread and TEK 5 point suitable for steel thicknesses from 

4.0 - 12.5mm. High threads situated under the head for supporting 

the top sheet of the panel. Tough three-stage zinc-ceramic coating 

for superior corrosion resistance.

nstallation

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.

Product Data

Material: SAE C1022 Carbon Steel

Finish: Zinc ceramic – 500-hour salt spray resistance

Head: 5/16" hexagon washer type

Steel Drilling Thickness: 4.0 - 12.5mm

Washer: 16mm diameter – 1.0mm thick galvanised steel with 

2.0mm thick EPDM gasket