Muggs, Did some more looking. It turns out this is an odd situation. Machinery's Handbook say 12tpi is the standard fine thread as does SW, but in bolt catalogs only 14tpi is available for 1 inch bolts.
Interesting. Even my old Starrett decimal equivalents and tap drill chart shows only 1-8 and 1-12. Looking at tool catalogs they have 1-8, 1-12 and 1-14 taps stocked. HHMMMMMMMMM! Dave H
For example: A typical vendor catalog only stocks 1-14 for fine threads. http://www.fastenal.com/web/product...610331,17511,611106&c=600003&vp=1&laId=600049 http://www.fasnetdirect.com/kaneprls.asp?SellCode=CH5OF http://www.fasnetdirect.com/kaneprls.asp?SellCode=CH8LF 1-12 bolts generally aren't on the radar.