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UNC Helicoil Type Inserts - Tapped Hole Dimensions Table

NOTE: BSW is now superseded by UNC  in practice except for 1/2" which is 12 T.P.I. (UNC is 13 T.P.I.). In almost all other smaller sizes, interchanging BSW with UNC does not cause any practical problem.

 

UNC helicoil type inserts - tapped hole dimensions table

 

Need Data On Specific Threadforms Click Below

METRIC

UNC

UNF

BSW & BSF

BSPP/BSPF

BA

NPT

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