Structural bolts & fasteners

Self-drilling screws & cladding fasteners

Self-drilling hex-washer-head screws with EPDM washers for roof and wall sheeting to purlins and girts – corrosion class 3 / 4, stitching screws and rivets.

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Self-drilling screws with EPDM washers fixing roof sheets

Hex washer head screw with sealing washer

Hex-washer head with bonded EPDM washer.

Self-drilling, hex washer head
Bonded EPDM sealing washers
Corrosion class 3 and 4 (AS 3566)
For steel up to 12 mm and timber
Stitching screws and blind rivets
Colour-matched heads on request

What it is

Roof and wall sheets are fixed to purlins and girts with self-drilling screws that drill, tap and seal in one operation. The bonded EPDM washer seals the hole; the drill point is chosen for the purlin thickness.

World Steel supplies screws with the roof and wall sheeting and calculates the quantity from the sheet layout and the wind-zone fixing pattern.

Range

Cladding fasteners
Fastener	Typical size	Use
Roof screw (crest fixed)	12-14 × 55 – 65 mm	Sheeting to steel purlins 1.5 – 3 mm
Wall screw (valley fixed)	12-14 × 20 – 25 mm	Wall sheeting to girts
Heavy-section screw	12-24 × 32 – 45 mm	Steel 4.5 – 12 mm
Stitching screw	14 × 20 mm	Side laps, flashings
Blind rivet	4.8 mm sealed	Flashings and trims

Corrosion class

Coastal and industrial sites need class 4 coatings or stainless steel; class 3 is common elsewhere. The screw must outlast the sheet coating.

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