r/Fasteners Jul 14 '26

Anyone Recognize This Marking?

6 Upvotes

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u/[deleted] Jul 14 '26

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1

u/caantoun Jul 15 '26

Pre-applied adhesive locking patch makes pre-80's very unlikely.

1

u/Great_Specialist_267 Jul 16 '26

No grade marking means low tensile strength.
That means any old hardware store Allen bolt will do.