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

Hexagon head screws with self-drilling point and bonded EPDM 

washer for roofing, cladding and general fastening applications 

to structural steel. Fine thread and TEK 5 point suitable for steel 

thicknesses from 4.0 – 12.5mm. 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.

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 gaske