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Measure across the outside of the thread - not the shank - to get the gauge (an 8g screw measures about 4.2mm). Screw gauges have a wider tolerance than bolts, so treat it as a close match rather than exact. Then measure the length - countersunk timber screws are measured overall, head included.
Every product page carries a Screw Gauge and TPI chart for its range - every gauge links straight to the product. Rule of thumb for timber: coarse threads for softwood and framing, fine threads for hardwood.
Button and Wafer head timber screws are low-profile alternatives to the hex flange for sheet-on-timber fastening. The flat head form clamps cladding firmly without protruding past the cladding face, so downstream cladding layers or finish coats sit flat over the fastener.
Also known as: Wafer Head Timber Screw, Pancake Head Screw, Button Head Stitching Screw, Pan Head Timber Screw.
8g-15 gauge with full thread, lengths 12mm-15mm. Phillips PH2 drive. Needle Point self drilling tip. Zinc Yellow Class 4 finish. Used for thin-sheet cladding fastening into timber framing where head profile matters.
GRADES AND MATERIALS
Zinc Yellow (Class 2): zinc plate with a yellow chromate passivation - interior and dry, sheltered work. Galvanised (Class 3, 4, B8 and X9): galvanised finishes for exterior and structural work and treated-pine exposure - the higher the class, the harsher the environment it suits. Higher Classes and painted variants available.
DRIVE AND INSTALLATION
Drive with PH2 Phillips at 1500-2500 RPM. Set driver torque to seat the head firmly without dimpling the cladding face. The flat seat clamps cladding to timber without the protrusion of a hex flange head.
SIZE AND THREAD
8g-15 (4.20mm shank), 12mm and 15mm lengths. Suits cladding-to-timber stack of ~5-10mm total. For thicker substrate stacks, switch to the Hex Flange variant.
WHY AUSTRALIA TRUSTS BOLT & NUT
With 15+ years selling fasteners online from Brisbane, we hold over 25,000 stock lines and 200 million pieces - 98.75% of online orders placed before 1pm leave same day. Save more as you buy more - we offer up to 13 price breaks plus 3 spend-tier discounts. Read our customer reviews or get in touch if you need help picking the right button or wafer timber screw.
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Button and Wafer head timber stitching screws - low-profile heads with Needle Point self drilling tip. For sheet-on-timber cladding fastening. 8g coarse, Phillips PH2 drive, Zinc Yellow Class 4 finish.
TECHNICAL RESOURCES
Pilot-hole, drive size and gauge reference: Technical Resources. Choosing a finish? See our guide to choosing a screw coating, and match the size on our screw gauge sizing chart.
