![]() ![]() * Values are calculated for Length of engagement of 5xPitch. Style B charts provide a pipe tap drill chart as well as decimal equivalents of tap drill sizes, fractions, wire gauge drill sizes, letter drill sizes, and metric sizes. * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 1.3006 - 1.312 33.035 - 33.325 d 2 Pitch Diameter 1.2538 - 1.2579 31.847 - 31.951 d 3 Minor Diameter Style A charts provide decimal equivalents of fractions, wire gauge drill sizes, letter drill sizes, and metric sizes. For calculations of different engagement length use the Thread Calculator (UNR Only) 1.2111 (Ref) 30.762 (Ref) α Varation of 30° anngle (+/-) 0.9167 (Ref) 23.284 (Ref) P Varation of pitch (+/-) 0.0016 (Ref) 0.041 (Ref) UNEF - Unified Extra Fine Thread, which is used for special purposes. Tap drills and percent basic thread height Percent Probable of thread oversize, Probable hole size mean Tap drills and percent basic thread height Percent. ![]()
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