M3; thread pitch 0.5mm, spanner size 5.5mm.
M4; thread pitch 0.7mm, spanner size 7mm.
M5; thread pitch 0.8mm, spanner size 8mm.
M6; thread pitch 1.0mm, spanner size 10mm.
M8; thread pitch 1.25mm, spanner size 13mm.
M10; thread pitch 1.5mm, spanner size 17mm.
M12; thread pitch 1.75mm, spanner size 19mm.
M14; thread pitch 2.0mm, spanner size 22mm.
M16; thread pitch 2.0mm, spanner size 24mm.
M18; thread pitch 2.5mm, spanner size 27mm.
M20; thread pitch 2.5mm, spanner size 30mm.