Head Bolt continually weeping

[rockfla]

Originally Posted by 19Fordy

rockfla is 100% correct about not using stainless nuts and bolts as they shear too easily using the torque required on head bolts. The threads will stretch, especially after repeated use.

Industrial fasteners being my business......I have had long conversations with an associate who helped write both SAE and ASTM fastener specs and has forgotten 3X's as much I have known about Stainless Steel. He said "nuts" are not as critical as studs and bolts....They get a good amount of "work hardening" when they are made.......He has done many pulls on SS nuts to as much as 120,000psi .........BUT That is not normal and NOT the norm for Stainless fastener industry in general!!!!! Again, I would not trust any SS fastener for something as important as a head stud, bolt or nut!!!!! Since he has already pulled 60 and NOT stripped a bolt (or in this case a nut) certainly lends itself to "work hardened".........still I would not trust it!!!!




Also let me preface my comment to "commercially available" Stainless Steels which in my case would encompass 303, 304, 305, 307 OR more commonly the all previous mentioned into 18-8, 316, 316L B8 and B8M. There are a few who sell a "strain hardened" Stainless and IF that is what was used then my platitude is null & void.


Also, just at a quick glance those appear to be a "finished" pattern nut and NOT a "heavy pattern" nut as well, "IF" so.....Another NO NO. They were and NEED to be of the Heavy Pattern!!!!