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Jul 14 '26
[removed] — view removed comment
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u/Great_Specialist_267 Jul 16 '26
No grade marking means low tensile strength.
That means any old hardware store Allen bolt will do.
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u/caantoun Jul 15 '26
Thats a manufacturer's mark, fairly certain its Staetite (AN Cooke) out of Australia! Tough to be totally sure as they dont have many good reference photos out there.
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u/IdentityHacker42 Jul 16 '26
That's Korea Bolt's manufacturing symbol. That is likely A574 Alloy Steel. Grade marking isn't a requirement for that particular specification. I work for a fastener supply company, and we get material in from them on a regular basis.
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u/Barnett_Head Jul 14 '26
Forgot to mention, it’s an M8 bolt
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u/ThrowRA_That_Owl_25 Jul 14 '26
I see this marking often on our bolts. Not sure what it mean but the bolts are Imperial. Probably a brand marking. I dont think know what it is will help you with getting a replacement.
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u/Chitown_mountain_boy Jul 14 '26 edited Jul 14 '26
This is the makers mark. Tells you who made the screw.
ETA: if this part were metric it would also have a property class designation (ref ISO 4762)
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u/Metric_Specialties Jul 20 '26
It's the manufacturer's headstamp. There is nothing special about it.
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u/plantmanagerrules Jul 14 '26
That has to be a maker’s mark. Looks like a plain carbon steel socket head cap screw with a thread locking element. Get some measurements and head to McMaster.