Roofing Bolts with Square Nuts - Zinc M6 x 8 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. Corrosion Rating (1-5) 1 - Clean, dry & low humidity environments Thread L (mm) 8 Thread Ø (mm) M6 Thread Type Metric Finish Zinc Recess Type Cross Head Ø (mm) 14 Nut Socket Size (mm) 11 Included Items M6 Square Nuts Material Carbon Steel MOQ Increment 1 Point Type B Point Head Type Dome Size (mm) M6 x 8 MOQ 1 Nut Size (mm) M6 Nut Type Square Substrates Hardwood, Softwood, Plastic, Steel, Thin Sheet Metal Thread Coverage Fully Threaded