The threaded hole M5 general drill big bottom
1. for brittle materials (steel, copper etc.) bottom: 5-0.8=4.2mm.2. (for cast iron, bronze, aluminum) plastic material bottom: 5-1.1 * 0.8 = 4.1mm or 4mm can.
General drilling screw threads diameter can be directly check the manual or by the following formula:Brittle materials (cast iron, bronze): bore diameter D=d (thread outside diameter) -1.1P (pitch)Plastic material (steel, copper, etc.): drilling hole diameter D=d (L thread diameter) -P (pitch)
M5 is an ordinary coarse thread, with a pitch of 0.8mm and a nominal diameter of 5mm. General coarse thread without marked pitch.
