NPT amp NPTF NPS amp NPSF Pipe Tap Size Pitch TPI Drill Size inch Pitch TPI Drill Size inch 1 16 27 0 242 C 1 8 27 0 332 Q 27 0 348 S 1 4 18 7 16 18 29 64 3 8 18 9 16 18 19 32 1 2 14 45 64 14 47 64 3 4 14 29 32 14 15 16 1 11 1 2 1 9 64 2 11 2020 3 19 nbsp 0183 32 Drill Bit Sizes Metric The drill size chart contains tools up to 1 5 inches in diameter but larger tools are also commonly used Drill Bit Sizes English Tap Sizes Metric For each thread count the equivalent thread pitch is provided and for metric taps the Thread Size Tap Drill mm Thread Size Tap Drill mm Thread Size Tap Drill mm Thread Size Tap Drill mm M4 x 0 35 3 60 M10 x 0 75 9 25 M16 x 1 15 0 M24 x 1 5 22 5 M4 x 0 5 3 50 M10 x 1 9 0 M16 x 1 5 15 0 M24 x 2 22 0 M5 x 0 5 4 50 M10 x 1 25 8 8Tap and Drill Size Chart Contact us for more information THREADSIZE DRILL DIAMETER Coarse Thread TAP DRILL SIZE 1 64 0595 No 53 2 56 0700 No 50 3 For a 3 8 NPT Tap you will need a 37 64 drill bit Here are some other common closely related sizes and the drill bits they require in case you are looking for information on more than one Tap Size Drill Size 3 8 37 64 189 23 32 190

3 8 – 18 NPT 7031 45 64 45 64 1 2 – 14 NPT 9219 59 64 59 64 3 4 – 14 NPT Drill This Hole Size Decimal Inches Drill Size Nearest Fraction To Tap For This Size Bolt or Screw 0984 2 5 mm none 3 mm – 0 60 pitch 1015 No 38 none 5 – 40 1100 No 35 7 64 3 4 Tap Drill amp Clearance Hole Sizes Chart Click here for legal disclaimer Thread Size Tap Drill Sizes Clearance Holes Size DIA Close Fit Non Struct 1 64 OS 0 80 UNF 3 64 0469 No 53 5 64 1 64 UNC No 53 0595 No 49 No 43 1 72 UNF No 53 0595 No 49 Nominal Tap Size Drill Size 1 16 27 NPT F w o Reamer C 1 16 27 NPT F w Reamer A 1 16 27 NPSC 1 4 2022 2 22 nbsp 0183 32 Know what size drill bit for a 3 8 tap and learn when and how to use it Plus know other considerations before using a 3 8 NPT tap How to use ⅜ NPT Tap First and foremost you want to make sure what your drill size is It s a simple process that does involve a bitThe NPT National Pipe Taper Threads is based on the Briggs Standard Pipe Thread Drill sizes for Briggs Standard Pipe taps for direct tapping without reaming are indicated below Dimensions Sizes and dimensions of pipes and tubes and their fittings inside and outside diameter weight and more Threads Thread data metric unified

Machinist Metric ISO Screw Thread Tap Drill Size Chart The following is a ANSI Standard Pipe Thread Recommended Tap size and Drilled Pilot Hole for Taper National Pipe Thread Taper NPT is a U S standard for tapered threads used on threaded pipes and fittings Tap Drill Chart 129 Tap Drill Chart Standard 2B Nominal Pipe Tap Size NPT amp NPTF w o Reamer w Reamer 1 16 27 CA 1 8 27 Q 21 64 1 4 18 7 16 27 64 3 8 18 9 16 9 16 1 2 14 45 64 11 16 3 4 14 29 32 57 64 1 11 1 2 1 9 64 1 1 8 11 4 11 1 2 1 31 64 1Tapping Drill HSS for NPT taps 1 8x27 NPT taps use 8 7mm tapping drill 1 4x18 NPT tap use 11 1mm tapping drill 3 8x18 NPT tap use 14 5mm tapping drill 1 2x14 NPT tap use 18mm tapping drill 3 4x14 NPT taps use 23 25mm tapping drill 1x11 5 NPT tap use 2017 1 19 nbsp 0183 32 3 8 NPT drill with a 37 64 bit to a minimum depth of 0 8125 amp tap to a depth of 0 7565 1 2 NPT drill with a 45 64 bit to a minimum depth of 1 03125 amp tap to a depth of 0 96025 Following these recommendations will only give you a full thread for the first 2 to 3 threads Tap ap Drill T Prob Tap Tap Drill Prob Size Size of Thread Size Size of Thread 0 80 56 74 3 8 24 Q 75 3 64 71 8 5mm 70 Tap ap Drill T Prob Tap Tap Drill Prob Size Size of Thread Size Size of Thread 1 6x 35 1 25mm 69 9 0x1 25 7 75mm 73

2020 4 22 nbsp 0183 32 List of Drill and Tap Sizes Drill Bit Sizes Metric The drill size chart contains tools up to 1 5 inches in diameter but larger tools are also commonly used Drill Bit Sizes English Tap Sizes Metric For each thread count the equivalent thread pitch is provided and for metric taps the approximate thread count is shown based on the pitch 3 16 24 4 3 1 4 20 5 8 5 16 18 7 3 3 8 16 8 8 NPT NPTF NATIONAL PIPE TAPER 1 16 60 186 Tap Size TPI Drill Only Drill amp Reamer 1 16 27 6 3 6 0 1 8 27 8 5 8 2 1 4 18 11 0 10 8 3 8 18 14 5 14 0 1 2 14 18 0 17 5 3 4 14 23 0 23 0 1 11 1 2 29 0 28 5 1 1 4 11 1Metric tap drill sizes are the diameter minus the pitch For example 42mm x 1 5 tap uses a 40 5 drill Follow these links to browse our taps and die selection For common National Coarse and National Fine sizes we offer hand taps spiral point taps spiral flute taps and oversize taps as well as round adjustable dies and hex rethreading dies 2020 3 28 nbsp 0183 32 Tap size Threads per inch Drill size w taper pipe reamer 1 8 27 21 64 1 4 18 27 64 3 8 18 9 16 1 2 14 11 16 Click to see full answer Keeping this in view how do you drill a hole in a 1 8 NPT For a 1 8 npt tap requires an quot R quot drill Run your tap into the hole to 24 x 3 21 22 x 1 21 TAP SIZE DRILL SIZE TAP SIZE DRILL SIZE 27 x 3 24 22 x 1 5 20 5 1 8 x 27 S Letter 8 8 1 8 x 27 R Letter 8 6 30 x 3 5 26 5 22 x 2 20 1 4 x 18 29 64 11 5 1 4 x 18 7 16 11 1 33 x 3 5 29 5 24 x 1 5 22 5 3 8 x 18 19 32 15 1 3 8 x 18

About this item Carbon steel pipe taps are designed to clean and or re thread damaged or Jam pipe threads Black oxide drill bit is ideal for production maintenance or portable drilling jobs 3 8 quot carbon steel NPT tap and 37 64 quot HSS drill bit with 1 2 quot ShankThe featured 3 8 18 NPT Tap is used for tapping the drilled 3 8 hole to 18 NPT for intake temperature gauge sensors in order to provide optimum results directly from the source The 37 64 high speed steel drill bit s overall length is 6 quot with a 118 176 point that drills holes with pinpoint precision The cobalt finish increases lubricity Tap Size Drill Size Tap and Drill Set 1 16 quot NPT Tap quot D quot Drill Bit 1 16 quot NPT Tap and Drill Set 1 8 quot NPT Tap quot R quot Drill Bit 1 8 quot NPT Tap and Drill Set 1 4 quot NPT Tap 7 16 3 8 nominal pipe size 18 number of threads per inch NPT symbol for the thread series and form i e National American Standard Pipe Taper Basic dimensions are given to four or five decimal places to eliminate errors when calculating gauge dimensions they do not imply a greater degree of precision than is normally obtainable Tap Drill Size for NPT and NPTF Taper Threads You got the job You ordered and received material You ordered and received taps and gages from North American Tool The job is now out in the shop to be manufactured and the first operation is to produce a hole before tapping How do you determine

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