Mild Steel Drywall Screw

About Mild Steel Drywall Screw

SDHP Hex Head Self Drilling Screw Description

An SDHP Hex Head Self Drilling Screw is a specialized industrial fastener designed for fastening metal sheets and structural components without pre drilling. SDHP usually means Self Drilling High Performance screws used in construction and steel fabrication.

Key Description

An SDHP hex head self drilling screw has the following features

Hexagonal head
Allows tightening using a spanner or socket and provides high torque and strong grip during installation

Self drilling point
A drill like tip that can drill tap and fasten in one operation without needing a pilot hole

Threaded shank
Machine type threads that ensure secure and tight fastening in metal or sheet materials

Washer often EPDM bonded
Provides sealing and distributes load especially useful in roofing work

Material and Finish

Usually made from hardened carbon steel such as C1022 grade or stainless steel
Common coatings include zinc plated Ruspert Dacromet or Xylan
These coatings help provide corrosion resistance and durability in outdoor use

Typical Specifications

Diameter ranges from 4.2 mm to 6.3 mm
Length ranges from 19 mm to 150 mm or more
Drill point types include number 2 number 3 number 4 depending on material thickness
Standards include DIN 7504 K or ISO 15480

Applications

Used in metal roofing sheet fixing
Pre engineered buildings
Steel structures and purlins
Wall cladding and sandwich panels
HVAC ducts and sheet metal work

Advantages

No pre drilling required which saves time and labor
Strong fastening with high load capacity
Resistant to vibration loosening
Suitable for metal to metal or sheet to structure connections
Long service life in outdoor conditions