M3 is our thinnest size of machine screw. Our M3 machine screws are made from a durable carbon steel and include a nut for tightening metal surfaces together. The M3 machine screw has a thread diameter of 3 millimetres, the M stands for millimetres followed by the size – in this case 3 mm. We stock different lengths and head types such as countersunk or pan head depending on the fitting you need.
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