Reply to "Odd "nutty" Request"

modeltrainspartsOGR Forum Member

From the info you provided: 12TPI is the nominal size for a 1/2" Whitworth nut; yet 5/8" across the flats perfectly fits a 5/16 (or 3/8 BSF) Whitworth wrench. What's all this mean? In standard British sizing a 12 TPI nut would be much larger than 5/8" across the flats. Two thoughts: If you have a motorcycle shop in your area that works on old British bikes try them or contact a company called Metric and Multistandard for assistance. Sorry i can't be of more help.

3/16/1710:10 AM

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