07-01-2018, 11:10 AM
Hi Mark,
How long are your bolts? I may be able to test them for Yield strength.
Bolts with "no coating" are usually supplied with an oxide film, that may be dry, but has usually been oil quenched and possibly washed, this does give them a degree of lubrication. An absolutely dry assembly will give tightening problems due to the torsional "twist" when tightening due to the high thread friction. Best to assemble with Light oil, not with any additives as suggested by Bob Culver.
Clive
How long are your bolts? I may be able to test them for Yield strength.
Bolts with "no coating" are usually supplied with an oxide film, that may be dry, but has usually been oil quenched and possibly washed, this does give them a degree of lubrication. An absolutely dry assembly will give tightening problems due to the torsional "twist" when tightening due to the high thread friction. Best to assemble with Light oil, not with any additives as suggested by Bob Culver.
Clive