Keel Bolt Torque Table



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