Bolt Diameter Torque (Nm) Torque (Ft/Lb)
1/2" 26 .0 19.2
5/8" 66.0 48.7
3/4" 130.0 95.9
7/8" 190.0 140.1
1" 224.0 165.2
1-1/8" 420.0 309.8
1-1/4" 460.0 339.3
1-1/2" 795.0 586.4
This Table is derived from information in Table A7 from ISO/DIS 12215‐9.2. These values are for well greased threads. Friction in the screw and under the bolt head makes up approximately 90% of the tightening torque and approximately 10% contributes to prestressing of the bolt. The user is cautioned to use good judgement in applying these values.
Data courtesy of R. Alan Johnstone of J/Boats, Inc. via Mike Hoyt