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Flat Top Stitching Timber Screws
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.
Flat Top stitching screws are the lowest-profile head in the timber screw range. The flat head almost disappears against the cladding face, so visible architectural cladding work doesn't show the fastener line. Used where the cladding will not be covered by a downstream finish.
Also known as: Flush Head Stitching Screw, Trim Head Timber Screw, Architectural Cladding Screw.
10g-15 gauge with full thread, 16mm length. Phillips PH2 drive. Needle Point self drilling tip. Zinc Yellow Class 4 finish. Limited length range - suits thin cladding sheets only.
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. Watch driver torque - the flat head seats almost flush; over-driving will dimple the cladding face. The PH2 drive can cam-out under high torque, which actually protects the visible cladding face from over-drive damage.
SIZE AND THREAD
10g-15 gauge (4.80mm shank), 16mm length only. For longer fasteners use Button or Wafer or Hex Flange variants.
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Flat Top stitching timber screws - minimum-profile head sits almost flush against the cladding for visible architectural cladding work. 10g-15 gauge, 16mm length, Phillips PH2.
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.
