Roofing Bolts with Square Nuts - Zinc M5 x 30 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 L (mm) 30 Substrates Hardwood, Softwood, Plastic, Steel, Thin Sheet Metal Corrosion Rating (1-5) 1 - Clean, dry & low humidity environments Head Ø (mm) 12 Finish Zinc Material Carbon Steel Nut Socket Size (mm) 10 Recess Type Cross Thread Type Metric Nut Size (mm) M5 Thread Ø (mm) M5 Point Type B Point Head Type Dome MOQ 1 Nut Type Square MOQ Increment 1 Included Items M5 Square Nuts Thread Coverage Fully Threaded