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BSW & BSF Helicoil Type Inserts - Tapped Hole Dimensions Table

NOTE: BSW is largely superseded by UNC and has been for most engineering and automotive uses since the 1950's.  The main difference between the threads is that a BSW  thread has a "V"  angle of 55 degrees and UNC threads have a "V" angle of 60 degrees, otherwise the pitch or TPI is the same for both UNC and BSW except at 1/2" where UNC is 13 TPI and BSW is 12 TPI.  For most practical purposes a UNC bolt will screw into a BSW female thread and vice versa. For a few critical applications this may not be acceptable and for threads with very close tolerances this may also produce a problem.

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BSW helicoil type inserts tapped hole dimensions data and table for sizes 1/8 inch to 1-1/2 inch

BSW

BSF helicoil type inserts tapped hole dimensions data and table from 3/16 inch to 1-1/2 inches

BSF

 

Need Data On Specific Threadforms Click Below

METRIC

UNC

UNF

BSW & BSF

BSPP/BSPF

BA

NPT

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