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

Engineered for Versatility and Strength

Designed with a fine thread and sharp point, these drywall screws provide effective fastening to both wood and metal studs. The hardened mild steel core ensures each screw has the strength needed for long-lasting holds in demanding interior projects.


Superior Protection and Finish

The black phosphate coating not only gives these screws a professional appearance but also imparts excellent corrosion resistance. This surface treatment makes them ideal for interior environments prone to fluctuating humidity, ensuring performance and longevity.


Applications in Interior Construction

Perfect for fixing drywall sheets, these screws are the go-to choice for builders, contractors, and drywall specialists. Their standardized bugle head offers a neat finish while accommodating easy countersinking for smooth wall surfaces.