Got given a lifting eye (long story) and I can't ID the thread on it. It says on the ring part 5/8. The thread Dia is 0.643" ish and the nearest I can get on my gauges 19 TPI, Zeus etc show nearest at 5/8" UNF 18TPI but the Dia is wrong. Can anyone ID the thread( car towing eye maybe) It'll get skipped anyway so just curious.
Norm.
Norm.