asme-b18-2-3-7m-metric-round-head-square-neck-bolts

Dimensions of Metric Round Head Square Neck Bolts

Nominal Bolt Diameter, D, and Thread PitchDiameter of Reduced Body DsHead Radius, (R), RefHead Height, KHead Edge Thickness, CHead Diameter Dc, MaxBearing Surface Diameter, Dw, MinSquare Depth, FSquare Corner Depth, F1, MinSquare Width Across Flats, VSquare Width Across Corners, E
MaxMinMaxMinMaxMinMaxMinMaxMinMaxMin
M5 x 0.85.484.528.83.12.51.81.011.89.83.12.51.65.484.887.756.34
M6 x 16.485.5210.73.63.01.91.114.212.23.63.01.96.485.889.167.64
M8 x 1.258.587.4212.54.84.02.21.218.015.84.84.02.58.587.8512.1310.20
M10 x 1.510.589.4215.55.85.02.51.522.319.65.85.03.210.589.8514.9612.80
M12 x 1.7512.7011.3019.06.86.02.81.826.623.86.86.03.812.7011.8217.9615.37
M14 x 214.7013.3021.97.97.03.32.130.527.67.97.04.414.7013.8220.7917.97
M16 x 216.7015.3025.58.98.03.62.435.031.98.98.05.016.7015.8223.6220.57
M20 x 2.520.8419.1631.910.910.04.23.043.039.910.910.06.320.8419.7929.4725.73
M24 x 324.8423.1637.913.112.05.13.651.047.613.112.07.624.8423.7935.1330.93
  • All dimensions are in millimeters.
  • Lg is the grip gaging length which controls the length of thread B.
  • B is the basic thread length and is a reference dimension.
  • For additional manufacturing and acceptance specifications, see ASME B18.5.2.2M-1982, R1993.