Engineered by Bremick for professional polycarbonate roofing, the POLYCUT® Hex B8 Cat 5 screw drills, cuts, centres and seals in a single drive. Each 50 mm fastener features patented cutting fins that carve the correct expansion hole through the sheet as the tip bites into timber battens or light-gauge steel up to 1.6 mm thick. The result is a neat, stress-free fixing that allows Laserlite and similar panels to expand and contract without cracking. Product essentials Attribute Detail Brand / Series Bremick POLYCUT® Type Hex head crest-fix screw with polycarbonate washer Size / Thread 6.2-14 (approx. #14) × 50 mm Head 5⁄16 in AF hex, moulded captive washer Washer assembly 29 mm clear polycarbonate UV-stable EPDM seal Substrate compatibility Timber battens, metal purlins ≤ 1.6 mm Coating B8 Class 5 (marine-grade) multi-layer protection Corrosion rating AS 3566.2 Cat 5 (severe coastal & industrial) Pack quantity 50 screws Installation speed One-step fixing – no pre-drilling or reaming Key performance advantages One action installation – cutting wings create a perfectly centred 10 mm clearance hole, preventing sheet buckle and saving up to 50 % labour time compared with conventional two-step methods. Long-life seal – oversized polycarbonate washer spreads load across the crest and compresses the EPDM gasket evenly for watertight durability. High pull-out strength – coarse 14 TPI thread and Type 17 timber point deliver secure anchorage in softwood while the drill tip pierces steel purlins cleanly. Cat 5 coating – multilayer B8 finish resists red rust in salt-spray zones, ideal for coastal patios, pool enclosures and industrial skylights. Variations available Code description Size Pack size POLYCUT® Hex B8 6.2-14 × 50 mm 50 mm length 50, 250, 500 POLYCUT® Hex B8 6.2-14 × 65 mm 65 mm length 50, 250 All variants share the same Cat 5 coating, hex drive and integrated washer assembly, ensuring visual consistency across mixed sheet thicknesses. Typical applications Use these screws for crest fixing corrugated or 5-rib polycarbonate sheets to pergolas, carports, verandas, greenhouse roofs and factory skylights. They are equally at home on timber trusses or light steel frames, delivering reliable weather-tight performance in harsh environments. Installation guidance Position the screw on the sheet crest, perpendicular to the surface. Drive at medium speed until the washer just seats and the EPDM begins to compress. Do not over-tighten. Recommended spacing is every second crest on internal purlins and every crest at sheet edges. Choose the POLYCUT® Polycarbonate Fixing Hex B8 Cat 5 50 mm Pack of 50 from Singh Roofing Supplies for a fast, corrosion-proof and professional polycarbonate roofing solution.
