Predrill Chart 120 Deeds Drive, Dover, Ohio 44622, United. (UNR Only) 0.5754 (Ref) 14.615 (Ref) α Varation of 30° anngle (+/-) 1.25 (Ref) 31.75 (Ref) P Varation of pitch (+/-) 0.0008 (Ref) 0.02 (Ref) BSW BSPP BSPT Pipe Tap Size Pitch (TPI) Drill Size (inch) Pitch (TPI) Drill Size (inch) Pitch (TPI). * Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.6178 - 0.625 15.692 - 15.875 d 2 Pitch Diameter 0.5951 - 0.5979 15.116 - 15.187 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator BSW BSPP BSPT Pitch Drill Size Pitch Drill Size (TPI) (inch) (TPI) (inch) Tap Drill Charts British Standard Pipe Threads. * Values are calculated for Length of engagement of 5xPitch.
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