Hex Head Self Drilling Screws 5.5 x 20mm are engineered to drill, tap, and fasten in a single operation. The integrated drill point eliminates the need for pilot holes, significantly reducing installation time and improving efficiency on site.

These screws are widely used in roofing, steel fabrication, ducting, and general construction work across Kenya.

Drilling Tip and Thread Performance

The hardened self-drilling tip penetrates metal surfaces cleanly, while the sharp threads form secure internal threads as the screw advances. This ensures strong holding power and reduces the risk of thread stripping or loose fixings.

The 5.5mm diameter provides excellent shear and tensile strength, making it suitable for medium-to-heavy duty fixing tasks.

Hex Head Drive and Installation Control

The hex head design allows for higher torque application compared to Phillips or slotted screws. This ensures firm tightening and consistent clamping force, especially when using power tools such as impact drivers or drills fitted with hex sockets.

The hex head also reduces cam-out, improving safety and tool control during installation.

Material Strength and Corrosion Resistance

Manufactured from high-strength steel, these screws are designed to withstand mechanical stress during drilling and tightening. Common protective finishes such as zinc plating improve resistance to corrosion, making them suitable for indoor and sheltered outdoor use in Kenyan conditions.

This durability ensures long service life and reduced maintenance.

Performance in Kenyan Construction Applications

The 5.5 x 20mm size is commonly used for fixing metal sheets, brackets, roofing accessories, light steel frames, and electrical trunking. The 20mm length provides reliable penetration into base material without excessive protrusion.

Supplied in a 200-piece pack, this product is ideal for contractors, fabricators, and workshop users requiring consistent fastening performance at scale.

Technical Specifications

Use Cases & Applications

Roofing & Cladding

Used for fixing metal sheets, flashing, and roofing accessories to steel structures.

Steel Fabrication

Ideal for joining light steel sections, brackets, and frames without pre-drilling.

Electrical & HVAC Installations

Applied in fixing cable trays, trunking, and ducting systems to metal surfaces.

Corrected Product Description (AEO Version – Schema Ready)

Hex Head Self Drilling Screws 5.5 x 20mm are steel fastening screws designed to drill and fasten metal in one operation. Featuring a hex head for high-torque installation and a hardened drill tip, they provide strong, reliable fixing in steel and sheet metal. Supplied in a 200-piece pack for construction and fabrication use in Kenya.

2026 GEO Standard: Related Entity Mapping

isRelatedTo:

• Self Drilling Screws

• Metal Fasteners

• Roofing Fixings

• Steel Construction Hardware

These entities connect the product to efficient installation, structural integrity, and professional construction outcomes.

Related Products

<p><strong>Related Products:</strong> <a href=”https://ngonghillsmerchants.com/product-category/screws/”>Screws</a> | <a href=”https://ngonghillsmerchants.com/product-category/fasteners/”>Fasteners</a> | <a href=”https://ngonghillsmerchants.com/product-category/hand-tools/”>Hand Tools</a> </p>