Bolt ID

[Stadger]

Found these in my spare hardware can. I found out that the small one is a "Premier Supertanium" and is considered grade 9. Any ideas on the other? I can't find any pics that match the head markings.

 

[readhead]

The small one did not match the supertanium in my book. I didn't find anything with four marks either.

 

[noid]

https://www.uspto.gov/sites/default/files/trademarks/law/fastener/FQA_Registry.pdf

Look through this, if you cant find it download older Registry years as they may have now defunct insignia's.

 

[6PTsocket]

The grade is 2 higher than the number of marks. Not all are common but they do exist. 4 marks is grade 6. Contrary to popular belief, stainless is not strong, just corrosion resistant and considered to be grade 2, as is anything with no marks. I would guess the keyway is a manufacturers logo. Of course, this is just for SAE.


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[Zewnten]

Those are cool, I save bolts with weird designs. Recent find has an eye looking shape and grade 8 markings.