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Hex head self-drilling screws, for joining roofing sheets to light section steel (Max. 4.5mm) without the need to pre-drill a hole.
ā¢ Fire Classification - A1
Features Manufactured to mechanical specification SAE J78-1979 to achieve a surface hardened up to 650 HV to prevent torque shearing under load and a core hardness of up to 400 HV for improved ductility. Made from C10-18 steel. Plated in zinc 3-5 microns. Full batch-traceability to the original steel mill certificate.
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