Self Drilling Hex Screws 5.5 x 1-1/2 – EPDM Rubber Gasket Washer, Zinc Plated, 200pcs

Hex Washer Head Fasteners with a Bonded Sealing Washer

The Self Drilling Hex Screws are 5.5 mm fasteners supplied in 1-1/2 inch length with a bonded EPDM washer under each hex head. A TEK point drills, taps and fastens in a single pass through steel sheet up to 5.5 mm thick.

Each screw carries a coarse thread rolled from carbon steel and a clear zinc plating that resists white rust in humid coastal air. The 8 mm hex head accepts a standard nut driver or magnetic bit holder. The EPDM gasket compresses to roughly 30% of its free thickness and seals the hole against wind-driven rain.

Boxes hold 200 pieces and suit roofing crews, cladding installers and light steel fabricators. The 38 mm length reaches through 0.5 mm sheet into a timber purlin without the point protruding into a ceiling void. Installers drive each screw until the gasket seats flat against the panel face.

Key Features

• TEK Self-Drilling Point
  The drill point cuts through mild steel sheet without a pilot hole, so one tool completes the fixing.

• Bonded EPDM Gasket
  A moulded rubber washer vulcanised to the head flange deforms under load and closes the penetration.

• Thread and Material Detail

  • Coarse thread rolled from carbon steel for grip in timber and thin steel.
  • Clear zinc plating guards against white rust on stored stock.
  • 5.5 mm major diameter matches common #12 roofing practice.

• 8 mm Hex Washer Head
  The integrated flange spreads clamping force and takes a standard 8 mm nut driver or impact bit.

• 38 mm Overall Length
  The 1-1/2 inch body spans panel, insulation batten and purlin in one pass.

• Corrosion Resistance
  Zinc plating passes a 72-hour neutral salt spray test before red rust appears on the threads.

• 200-Piece Trade Box
  The carton carries 200 screws in a resealable bag, enough for a small canopy or carport roof.

• Impact Driver Compatible
  The head geometry holds torque under an impact driver without cam-out on the socket flats.

Specifications

What’s in the Box

• 200x self-drilling hex screws with bonded EPDM gaskets

• Resealable poly bag inside a printed carton

Why Choose This Trade Box

• The bonded gasket eliminates a separate washer step, which shortens roof fixing time per square metre.

• A 38 mm body covers panel, batten and purlin without a second fastener length on site.

• Zinc plating and a vulcanised rubber seal together handle both corrosion and water ingress on exposed roofs.

• The 8 mm hex drive mates with common impact drivers, so crews carry one bit size across the whole job.

• Two hundred pieces per carton covers a small canopy without ordering a full trade pack.

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