Nyloc Hex Nut. M8 x 1.25 mm pitch - nut height 8 mm - spanner size 13 mm. M12 x 1.75mm pitch - nut height 12 mm – spanner size 19. M10 x 1.5 mm pitch - nut height 10 mm - spanner size 17 mm. M4 x 0.70 mm pitch - nut height 5 mm - spanner size 7 mm.