PipeThread Drilled Hole Sizes Drill sizes given are the ‘closest’ drill size. NOMINAL SIZE NPT NPTF NPSC NPSM NPSF NPSI BSPT BSPP 1/16 - 27 D (0.246) D (0.246) 0.25 0.25 0.25 1/8 - 27 Q (0.332) Q (0.332) 0.3437 0.3593 0.3437 0.3437 1/8 - 28 0.3281 0.3437 1/4 - 18 0.4375 0.4375 Whilestandard screw threads generally use between 10 and 12.5 percent truncation, the pipe threads seem to use a smaller percentage. The 1/16 - 27 NPT in particular uses between 0.0012" (minimum) and 0.0036" (maximum) truncation at both areas. That translates to percentages between 3.74% and 11.2%. I have found that using a

NPT : Pipe and Fitting Thread Dimensions and Tolerances. All the relevant data for this tread in one spot. Skip to content. Your machining expert Stay Connected: 1.77978: 45.206: Tap Drill Size (T) 1.7344: 44.054: 1 1/2-11.5 NPT - Internal (Fitting) Drawing. Overview Drawing. Profile Drawing. 1 1/2-11.5 NPT - Tolerances. Property

14" Carbon Steel NPT Tap and 7/16" HSS Drill Bit in plastic pouch. NPT Tap and Drill Set comes in an easy to maintain plastic pouch; Set contains one Carbon Steel NPT Pipe Tap and the matching size Black Oxide High Speed Steel Drill Bit; Carbon steel NPT pipe taps are designed to clean and or re-thread damaged or jammed pipe threads
StandardNPT Tap Drill Sizes Chart. March 13, 2013. Charts; StandardNPTTapDrillSizesChart.pdf. Standard NPT Tap Drill Sizes. NPT Size: Tap Drill Size (in.) Decimal Equivalent (in.) 1/16 – 27 ANSIB1.20.1 - NPT - American National Standard Taper Pipe Threads NPT and NPTF pipe threads - dimensions according ANSI/ASME B. British Standard Brass . 54 359 197 104 58 326 315 221 234

1 4 npt thread drill size