asme-b18-5-round-head-fin-neck-bolts

Dimensions of ASME B18.5 Round Head Bolts

Nominal Size or Basic Bolt DiameterBody Diameter, EHead Diameter, AHead Height, HMaximum Fillet Radius, R
MaxMinMaxMinMaxMin
No. 100.190.1990.1820.4690.4380.1140.0940.031
1/40.250.2600.2370.5940.5630.1450.1250.031
5/160.31250.3240.2980.7190.6880.1760.1560.031
3/80.3750.3880.3600.8440.7820.2080.1880.031
7/160.43750.4520.4210.9690.9070.2390.2190.031
1/20.50.5150.4831.0941.0320.2700.2500.031
5/80.6250.6420.6051.3441.2190.3440.3130.062
3/40.750.7680.7291.5941.4690.4060.3750.062
7/80.8750.8950.8521.8441.7190.4690.4380.062
111.0220.9762.0941.9690.5310.5000.062
Notes :
  • Where specifying nominal size in decimals, zeros preceding decimal and in the fourth decimal place shall be omitted.
  • The minimum radius is one half of the value shown.