SeeDrill Sizes for NPT Pipe Threads Calculator. Note f : MIL—P—7105 gives the wrench makeup as three threads for 3 in. and smaller. The E 3 dimensions are then as follows
Thispage provided the thread dimensions of 1/16 - 27 NPTF; NPTF stands for National Pipe Thread Fuel, based on ASTM B1.20.3. Ideal Tap Drill Size: 0.24050: 6.109: Nearest standard Inch drill: C (0,242) 1/16 - 27 NPTF - Internal Thread Drawing. Overview Drawing. Profile Drawing.
Asa general rule, the size of the drill bit required can be easily estimated by subtracting the pitch of the thread from its diameter. A ½ tap has several types and depending on that, and you need to choose the size of the bit. A ½-13 NC tap requires a 27/64″ size, ½-20 NF, and ½-24 NS requires a 29/64″ size.

75 hole drill size (in.) Maximum thread depth (in.)* NPT Threads. Currently only available for milled parts in aluminum, copper, and brass. Internal NPT Thread Min Modeled Pilot Dia (in.) Max Modeled Pilot Dia (in.) Nominal Modeled Pilot Dia (in.) Min Pilot Depth (in.)(Through Hole)

Whenit comes to tapping a 1/2 NPT (National Pipe Taper) thread, it's essential to use the correct size drill bit to ensure proper threading. The recommended DRILLAMERICA m14 x 1.75 HSS Plug Tap and 31/64in HSS 1/2in Shank Drill Bit Kit POUMS14X1.75 DRILL AMERICA 1/4in-26 UNS HSS Plug Tap and #4 HSS Drill Bit Kit POUFS1/4-26 QUALTECH Combined Drill and Tap, Series DWT, Imperial, 1224 Thread, Round Shank, HSS, Bright DWT12-24DRAP
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andneed to drill and tap the inlet manifold for the pressure sensor. As Steve noted the concensus is that the reaming isn't needed for this kind of application. There's no direct UK/European equivalent of the 1/8 NPT thread but it turns out NPT taps are not difficult to get here. An 8.5mm drill bit is OK in place of the R size drill bit.
LNfL4.
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    • 1 2 npt thread drill size