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Algoa Steel Vaal (Pty) Ltd

6 Taaibos Street, Powerville Industrial Park,

Powerville, Vereeniging, Gauteng, South Africa

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© 2019 ALGOA STEEL VAAL (PTY) LTD

Fasteners

Roof Screw Selection

CORRUGATED INTO TIMBER

50mm 

65mm

CORRUGATED INTO STEEL

38mm 

50mm 

 

IBR INTO TIMBER

90mm 

85mm 

75mm

 

IBR INTO STEEL

65mm 

85mm 

Did you know?
The fastener length is determined by:
- Profile height of sheeting
- Compressed thickness of insulation
- Thickness of washers & seals
- Thickness of steel purlins
- Length of drill point and first 3 threads above drill point in case of steel purlins
- Minimum 35mm penetration into timber in case of timber purlins
Fastener point selection
Timber: Type 17 point
Thin gauge steel: stitching point
Thin gauge steel: zip point
Cold rolled steel: drill point (4.5mm capacity)
Hot rolled steel: drill point (12.5mm capacity)
Fastener head selection
Klip-tite, Klip-Lok, Brownbuilt, Saflok: Wafer head
Corrugated, IBR, Stitching, Laps: Hex flange head & seal
Classification & designation of corrosion resistance
Corrosion resistance class
C1 - 
C2 - 
C3 - 
C4 - 
C5 - 
Atmosphere of intended use
General use in internal application.
General use in other than external applications but where significant levels of condensation occurs.
External use in mild, moderate industrial or marine environments.
Corrosivity categories C2 and C3 classified in accordance with ISO 9223.
External use in severe marine or industrial environment.
Corrosivity category C4 classified in accordance with ISO 9223.
External use in very severe marine or industrial environment.
Off shore environments.
Material Compatibility
Fastener coating must be compatible with sheeting to prevent galvanic corrosion and comply with manufacturer's warranty
Class 2 - 
Electro plated
Class 3 - 
Mech plated
Class 4 - 
Mech plated
Class 5 - 
Stainless steel
Galvanised sheeting
Galvanised, ZincAL, Chromadek & Colourplus sheeting
Galvanised, ZincAL, Chromadek & Colourplus sheeting
Aluminium & Stainless Steel sheeting
Our standard fastener range
22mm Class 3 Stitching Scew
25mm Class 3 Steel Screw
50mm Class 3 Steel Screw
65mm Class 3 Steel Screw
75mm DuoTapp Screw (for fixing into steel or timber)
65mm Class 3 Timber Screw
90mm Class 3 Timber Screw
50mm Class 4 WINGED Steel Screw for Corrugated polycarbonate sheeting
75mm Class 4 WINGED Steel Screw for IBR polycarbonate sheeting
Ask our friendly sales consultants about  our washers, colour caps, rivets, butyl stripseal, etc or get a price list here