Standard Hexagonal Bolt Dimensions

Bolt DiameterEFGH
Body DiameterWidth Across FlatsWidth Across CornersHead Height
MaxBasicMaxMinMaxMinBasicMaxMin
1/40.2507/160.4380.4280.5050.4885/320.1630.150
5/160.3131/20.5000.4890.5770.55713/640.2110.195
3/80.3889/160.5620.5440.6500.6201/40.2680.226
1/20.5153/40.7500.7250.8660.82611/320.3640.302
5/80.64215/160.9380.9061.0831.03327/640.4440.378
3/40.7681-1/81.1251.0881.2991.2401/20.5240.455
7/80.8951-5/161.3121.2691.5161.44737/640.6040.531
11.0221-1/21.5001.4501.7321.65343/640.7000.591
1-1/81.1491-11/161.6881.6311.9491.8593/40.7800.658
1-1/41.2771-7/81.8751.8122.1652.06627/320.8760.749
1-3/81.4042-1/162.0621.9942.3822.27329/320.9400.810
1-1/21.5312-1/42.2502.1752.5982.48011.0360.902
1-3/41.7852-5/82.6252.5383.0312.8931-5/321.1961.054
22.03933.0002.9003.4643.3061-11/321.3881.175
2-1/42.3053-3/83.3753.2623.8973.7191-1/21.5481.327
2-1/22.5593-3/43.7503.6254.3304.1331-21/321.7081.479
All dimensions shown in inches. Dimensions per ASME B18.2.1 1996