Transcription of Tapping Thread Dimensions - FWB
1 1 FWB Products Ltd 2020 ( ) Tapping Thread DimensionsContents2 Recommended Tapping and Clearance Drill Sizes Page 3 British Standard Whitworth ThreadPage 4 British Association Thread (BA)Page 5 Tapping Sizes (mm) for Fractional ThreadsPage 6 Tapping Drills (mm) for Number Size ThreadsPage 7 British Standard Pipe Thread (BSP) and Tapered Pipe Thread (BSP Tr)RcPage 8 American National Taper Pipe (NPT)Page 9 Recommended Tapping and Clearance Drill Sizes3 Nominal SizeOf Tap (mm)Pitch (mm) Tapping DrillSize (mm)Clearance DrillSize (mm)Nominal SizeOf Tap (mm)Pitch (mm) Tapping DrillSize (mm)Clearance DrillSize (mm) Standard Whitworth Thread4 Nominal Tap Size (inches) Tapping Drill Size (mm)Clearance Drill Size (mm)1/8 1/8 1/4 28321 1/2 3/4 39452 Association Thread (BA)5 Nominal Tap Size (inches) Tapping Drill Size (mm) Clearance Drill Size (mm) Sizes (mm) for Fractional Threads6 Nominal TapDiamater(inches)UNCUNFDSWBSFN ominal TapDiamater(inches)UNCUNFDSWBSF1/16 1/8 1/4 3/8 1/2 5/8 --36387/16 3/4 7/8 Drills (mm) for Number Size Threads7 Tap Standard Pipe Thread (BSP) and Tapered Pipe Thread (BSpTr)Rc8 Nominal Thread Size Tapping Drill Size (mm)BSP PL (Rp)BSP F (G)1/8 ( ) ( ) ( ) ( ) ( )-213/4 ( ) ( ) ( ) 1/4 ( ) 1/2 ( )45451 3/4 ( )-512 ( ) Thread Size Tapping Drill Size (mm)With ReamerWithout Reamer1/8 ( ) ( ) ( ) ( ) ( ) ( )29301 1/4 ( ) 1/2 ( ) ( )55562 1/2 ( )7071 British Standard Pipe Thread (BSP):British Standard Tapered Pipe Thread (BSP Tr)Rc.
2 American National Taper Pipe (NPT)9 Nominal Thread Size Tapping Drill Size With ReamerWithout Reamer1/16 ( ) ( ) ( ) ( ) ( ) ( ) ( ) 1/4 ( ) 1/2 ( ) ( )55562 1/2 ( )6667
