Are M5 and M6 the same?
Are M5 and M6 the same? The number after M is the nominal diameter of the threaded portion in millimetres. So M6 is thicker than M5.
What does the M in M6 stand for?
M6 refers to a metric 6 mm screw. The outside diameter of the threads is 6 mm. The standard metric rack screw is actually an M6 x 1 mm. The number 1 mm refers to 1 threads per millimeter.