Release time：2020-01-16 18:44 Browse：
Standard lengths: Typically range from 50mm to 300mm for most market-available double thread self-drilling screws with EPDM washers.
Custom lengths: Using advanced extended cold heading or welding techniques, they can be manufactured up to 400mm–500mm or even longer.
Drill point capacity:
For example, a #5 drill point can usually penetrate up to 6mm of steel, but the longer the screw, the greater the torque required — demanding higher drill point quality.
Material strength:
Often made from carbon steel (such as 1022 or 10B21) or alloy steel (SCM435), requiring proper heat treatment for high strength and toughness.
Manufacturing process limitations:
Multi-station cold heading machines have length constraints. Screws beyond that are usually made by welding or turning.
Steel structure roofing installations
Thick-layer connections
Solar panel mounting systems
Rock wool and steel profile fastening
