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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 .
4-1/4 Drill Bit. Only Sold Individually. Our most popular NPT Tap Sets: 5 Piece Carbon Steel NPT Pipe Tap Set, 1/8", 1/4", 3/8", 1/2" and 3/4" in Plastic Pouch Case. 6 Piece Carbon Steel NPT Pipe Tap Set, 1/8", 1/4", 3/8", 1/2", 3/4" and 1" in Wooden Case.
Tap Drill Charts | National Pipe Threads NPT & NPTF NPS & 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 ... 4 8 4-1/4 8 4-9/32 *Without taper reamer. Created Date: 12/12/2018 11:57:54 AM ...
The 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:
Tap drill size calculator for Inch and metric threads (For Cutting and Forming Taps). Plus formulas and charts for Tap Drill Size.
TAP DRILL SIZE CHART FOR NPT THREADS (National Pipe Threads) NPT Size: Tap Drill Size (in.) (Decimal) (in.) 1/16 - 27 "C" (0.242) 1/8 - 27 "Q" (0.332) 1/4 - 18: 7/16 (0.438) 3/8 - 18: 9/16 (0.562) 1/2 - 14: 45/64 (0.703) 3/4 - 14: 29/32 (0.906) 1.0 - 11•1/2: 1•9/64 (1.141) 1•1/4 - 11•1/2: 1 ...
This tap and clearance drill chart shows tap and clearance drill sizes for standard threads. There is also a printable version that has both metric and inch threads.
