Predrill Chart 120 Deeds Drive, Dover, Ohio 44622, United. Again, it means that telling BSPT and NPT threads apart will also not be easy unless you keenly check the thread angle or. The thread angle, pitch and shape is however the same. * 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 BSW BSPP BSPT Pipe Tap Size Pitch (TPI) Drill Size (inch) Pitch (TPI) Drill Size (inch) Pitch (TPI). The difference between British Standard Pipe (BSP) and British Standard Pipe Taper (BSPT) is that BSP threads are parallel while BSPT threads are tapered. For calculations of different engagement length use the Thread Calculator * Values are calculated for Length of engagement of 5xPitch.
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