Roofing Bolts with Square Nuts - Zinc M6 x 40 Manufactured with a large flat head, which distributes the load across the fixing to increase the clamping effectiveness. Making it ideal for clamping thin sheet metal, plastic and wood. Thread Ø (mm) M6 Nut Socket Size (mm) 11 Included Items M6 Square Nuts Finish Zinc Thread L (mm) 40 Substrates Hardwood, Softwood, Plastic, Steel, Thin Sheet Metal Point Type B Point Head Type Dome Nut Size (mm) M6 Nut Type Square Material Carbon Steel Head Ø (mm) 14 Corrosion Rating (1-5) 1 - Clean, dry & low humidity environments MOQ Increment 1 MOQ 1 Recess Type Cross Thread Type Metric Thread Coverage Fully Threaded