When I did a corporate setup, I also edited the hole tables... I eliminated all but the standard coarse and fine thread versions of both the standard and iso styles... That way I didn't have someone mistakenly using a hard to obtain thread... just a thought...
It's because the information comes from the Machine Handbook (table 4 "Tap Drills and Clearance Drills for Machine Screws with American National Thread Form")
The table in the handbook stops at ½ inch.
Christopher Rees - Mechanical Engineer - ISR Systems
UTC AEROSPACE SYSTEMS
100 Wooster Heights Rd, Danbury, CT 06770 U.S.A.
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