No. 8 x 1/2" Undercut Countersunk Square Dr Self Tapping Screw Zinc

Undercut Countersunk Square Dr Self Tapping Screw Zinc is a self-tapping screw from Hobson, manufactured to AS 3566.1-2002.

Where this product is used

• Suited to fastening jobs that need a flush-sitting countersunk head – decking, cladding and sheet-to-frame fixing – where a square drive is preferred to cut down on bit slip.

Product features

• Countersunk, undercut head sits flush with the work surface
• Internal square drive reduces cam-out during driving
• Self-drilling point eliminates the need to pre-drill
• Manufactured to AS 3566.1-2002 (head stamping required on Class 4 corrosion-resistant screws, ST4.8 and larger)
• Available in multiple point types – Needle Point for general purpose, Type 17 for lighter steel, Series 500 for thick steel, plus winged and vmaX points for timber-to-steel

Key specifications

Selecting the right option

Choose the point type and thread to suit the material you're driving into (metal, timber or masonry), and the head/drive combination to your tool. AS 3566 covers the self-drilling screw range generally — check the specific point style against the substrate thickness.