M4 x 0.7mm pitch, 7mm across flats
M5 x 0.8mm pitch, 8mm across flats
M6 x 1.0mm pitch, 10mm across flats
M8 x 1.25mm pitch, 13mm across flats
M10 x 1.50mm pitch, 17mm across flats
M12 x 1.75mm pitch, 19mm across flats
M14 x 2.0mm pitch, 22mm across flats
M16 x 2.0mm pitch, 24mm across flats
M20 x 2.5mm pitch, 30mm across flats
M24 x 3.0mm pitch, 36mm across flats