1 inch Machine A307 Bolts Torque Value
1 inch Machine A307 Bolts Torque Value
(OP)
Does anyone know a typical torque value for an ungraded ordinary machine ASTM A307 Grades A or B one inch diameter bolt. Grade C is of A36 typical steel values. The problem is that their is no Fy yield stress given in the ASTM standards for A or B bolts and thus their is no proof load associated with either A or B bolts. Any practical field experience feedback on this one would be greatly appreciated.






RE: 1 inch Machine A307 Bolts Torque Value
Part 7?
RE: 1 inch Machine A307 Bolts Torque Value
To me snug tight is just past finger tight, tight enough that you need a wrench to loosen the bolt. In a wood to wood connection the bolt should not be tighten to the point that the washer is embeding into the wood.
With wood the bolt values are established so that they apply to bolts that are tight and to bolts which have lossened due to wood shrinkage.
RE: 1 inch Machine A307 Bolts Torque Value
RE: 1 inch Machine A307 Bolts Torque Value
-Mike
RE: 1 inch Machine A307 Bolts Torque Value
Excellent information!!!
Unfortunately I have seen at least one wood design where the engineer used A307 fasteners and was relying on the clamping force developed in a wood to wood joint to produce friction resistance to prevent slip.
The problem with using friction in a wood to wood joint is that as the wood members dry out and shrink they reduce the clamping force.
RE: 1 inch Machine A307 Bolts Torque Value