These big machinery eye bolts came from a closed factory parts crib. They are 1 1/8 thread, 7 threads per inch. No documentation but they are USA made drop forged steel.
Forged 1/2"-13 Shouldered Lifting Eye Bolt Box of 10 Forged shoulder eye bolt with a 1/2-13 threaded shank. The shank length is 1-1/2" long with a ring I.D. of 1-3/16" and ring O.D.
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