Yeah but they definitely shared the love in those days, I mean all screw threads are well represented (BSW, new BSW, UNF, BSF, Gas, Pipe, Bicycle) with Cheney slipping you 8mm metric to keep you on the ball
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These young kiddies don't know they are born, try going to the parts counter with a 5/16 UNF/ Cycle thread combination inlet stud these days. Kehrist what were they thinking.