ProductDescription. The IRWIN HANSON 1/4" - 28 NF Tap and No. 3 Drill Bit is ideal for creating precise holes and 28 clean threads per inch in metal for general purpose drilling. The drill bit is constructed of high speed steel for fast drilling, while the tap is crafted of high carbon steel for durability. FemaleNPTF Table U22 — NPTF Dimensions 1) For bottoming taps only. Table U23 — BSPT Dimensions 1) For bottoming taps only. Male BSPT Female BSPT Thread Size NPTF O.D. Thread Length B Min. Tap Drill Depth 1) E Chmf. Dia. 1/8-28 0.39 0.31 0.38 0.42 1/4-19 0.53 0.44 0.47 0.55 3/8-19 0.67 0.47 0.53 0.69 Includessize of: 1/8" - 27 npt, 1/4" - 18 npt, 3/8" - 18 npt, 1/2" - 14 npt, 3/4" - 14 npt ; Versatile set suitable for both personal and professional use. Clean and Re-Thread Damaged or Jam Pipe Threads with Ease - Ideal for Pipe Fittings, DIYers, handymen, and professionals who need to repair damaged pipe threads. Revive Damaged Pipe 716" HSS Black & Gold KFD Split Point Jobber Length Drill Bit. KFD Killer Force Drill Bits are manufactured from M2 premium grade high speed steel. For use in a wide range of materials such aluminum, iron and stainless steel; 135° split point tip for fast penetration and accurate drilling; Round shank for use in a wide range of tool holding SeeTap Drill Sizes for NPT Pipe Threads . Note b: Reference dimension. - NPT Thread taper angle = 1/16 taper = 1 deg. 47 min = 0.75 in./ft . - The angle between the sides of Thecorrect size drill bit for a 1/4 NPT tap is 7/16 inches. This size is recommended for a variety of pipe and fitting sizes, including 1/8, 1/4, 3/8, 1/2, and 3/4-inch NPT threads. It Nowthat you know how to measure for a leak-free seal, you need to know the size of the drill bit required for a 1/8 NPT tap. As a general rule, the size of the drill bit required can be easily estimated by subtracting the pitch of the thread from its diameter. A 1/8 NPT tap requires an R-shaped drill bit. The R drill bit corresponds to a size ProfileDrawing 1/4-18 NPT - Internal (Fitting) Basic Thread Dimensions For interpertations of the terms scroll down to the drawings below the table 1/4-18 NPT - Internal (Fitting) .

1 4 npt thread drill size