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8.2.2.1 helps a little further. Basically for hex, heavy hex and jam nuts, proof load testing would be required for those with a proof load of 160,000 lb. For those with proof loads higher than 160,000 lb, you could stipulate Supplemental S4 requirement if you want the proof load tested.

From a vendor's point of view, I would say most of us are going to struggle with the B18.24 numbering system. And since most of us don't get asked for them too often, we would still thumb through the current or in most cases an older revision to find what you may be looking for. The numbering...

Outside of some of the aerospace standards, most all standard inch series nuts are 2B thread.

5iron - Yes. C1541 material meets the chemical requirments of SAE J429 Grade 5. You will want to ensure it is heat treated properly to meet the Grade 5 requirements.

Sorry MattBores, I don't see any I2 in any of the registered fastener manufacturer's markings books that I have. This isn't too uncommon though. Products made per print can be marked with whatever the enduser desires. If the information is available from the load cell manufacturer this would...

koneill44, you can contact the Fastenal engineering group using their contact e-mail from their website. They have a general service temperature guide for a number of different grades of fasteners. http://www.fastenal.com/web/services.ex?action=engineering

WillCole, unfortunately a number of failures get attributed to hydrogen embrittlement unjustly or without further investigating the true cause so you may struggle finding conclusive evidence certain processes do not have a risk. We have been using ASTM B695 (mechanical galv) for split lock...

Sorry about the miscue on the carbon content; it was meant to be 0.04%. We are dealing with the F593C and F593D, which would be the Group 1, cold-worked condition. As of now, we have tested approximately 80 different lots (incluidng five manufacturers), and have seen that about 25% of the...

We're finding a portion of the 18-8 stainless steel fasteners exceeding the hardness requirements of ASTM F593; which is HRC 32 for the cold-worked condition. I'm curious on the potential problems and issues that could be encountered with a stainless steel bolt with a core hardness of HRC...