That's a bit rich. Most fastener shops don't employ people who were even born when many thread systems were in common use and have never heard of them.
Go down to a bolt shop and ask about BSF, BSC, CEI Coarse, UN Constant pitch series, UNEF and see the reaction. They also appear to be unaware that as many as five pitches are in use in some metric diameters only knowing metric "M" and metric fine.
I stock and sell taps and dies in all these. BSC, BSF, UN 24 pitch are my best sellers yet restorers and repairers regularly complain of the difficulty in buying fasteners and of the blank looks they get from shoppies at bolt shops.


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