Tapping Thread Dimensions - FWB
1FWB Products Ltd 2020 ( ) Tapping Thread DimensionsContents2Recommended Tapping and Clearance Drill Sizes Page 3British Standard Whitworth ThreadPage 4British Association Thread (BA)Page 5Tapping Sizes (mm) for Fractional ThreadsPage 6Tapping Drills (mm) for Number Size ThreadsPage 7British Standard Pipe Thread (BSP) and Tapered Pipe Thread (BSP Tr)RcPage 8American National Taper Pipe (NPT)Page 9Recommended Tapping and Clearance Drill Sizes3Nominal 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 Thread4Nominal 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)5Nominal Tap Size (inches) Tapping Drill Size (mm) Clearance Drill Size (mm) Sizes (mm) for Fractional Threads6Nominal TapDiamater(inches)UNCUNFDSWBSFNominal 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 Threads7Tap Standard Pipe Thread (BSP) and Tapered Pipe Thread (BSpTr)Rc8Nominal Thread Size Tapping Drill Size (mm)BSP PL (Rp)BSP F (G)1/8 ( ) ()
fwb Tech & Download Content V2.14 www.fwb.co.uk Tapping Thread Dimensions Recommended Tapping and Clearance Drill Sizes Nominal Size of Tap (mm) Pitch (mm) Tapping Drill Size (mm) Clearance Drill Size (mm)
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