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Fastener Dimensions

Bolts, nuts and washers in accordance with current ISO standards.

Coarse Thread Bolt and Nuts Metric (mm)
Nominal DiameterPitchBolt Head ThicknessBolt Across FlatsNut Thickness
M330.52.1255.52.4
M440.72.92573.2
M550.83.6584
M6614.15105
M881.255.65136.5
M10101.57.18178
M12121.758.181910
M1616210.182413
M20202.513.2153016
M2424315.2153619
M30303.519.264624
M3636423.265529
Fine Thread Bolt and Nuts Metric (mm)
Nominal DiameterPitchBolt Head ThicknessBolt Across FlatsNut Thickness
M660.754.15105
M8815.65136.5
M10101.257.18178
M12121.258.181910
M16161.510.182413
M20201.513.2153016
M2424215.2153619
M3030219.264624
M3636323.265529
Plain Washers/Bright Metric (mm)
Internal DiameterExternal DiameterThickness (Thick Varient)Thickness (Thin Varient)
M33.270.6-
M44.390.9-
M55.3101.1-
M66.412.51.80.9
M88.4171.81.1
M1010.5212.21.45
M1213242.71.8
M1617303.32.2
M2021373.32.2
M2425444.32.7
M3031564.32.7
M3637665.63.3
Plain Washers/Black Metric (mm)
Internal DiameterExternal DiameterThickness
M55.5101.2
M66.612.51.9
M89171.9
M1011212.3
M1214242.8
M1618303.6
M2022373.6
M2426444.6
M3033564.6
M3639666
M4245788.2
M4852929.2

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