2031. 2-1/16. 2.062. 3-1/8. 2.180. 1. Countersink. It is considered good practice to countersink or break the edges of holes that are smaller than F (max.) in parts having a hardness which approaches, equals, or exceeds the screw hardness. If such holes are not countersunk, the heads of screws may not seat properly or the sharp edges on holes

BritishPipe Thread ( Whitworth Form) -- Taper (BSPT) Thread Designation BSPT: Nominal Size BSPT: Thread Form Type: Major Diameter mm The1/16”, 1/8”, 1/4”, and 3/8” sizes have a dissimilar pitch, which causes a misalignment of the threads. The flank angles of the threads are also different between NPT and BSP. NPT has a 60° thread where the BSP has a 55° thread. Figure 5 shows a male NPT thread tightened into a BSPP. 1¼” NPT taps need a 1 1/2 inches size drill bit and can be used for re-threading damaged pipe threads. They’re mostly used for tapping fittings and couplings much like the 1/8″ 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
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A1” NPT Tap needs a size drill bit of 1 5/32 inches or 1.1563 inches in decimals. NPT taps are also called pipe taps and don’t confuse them with NPTF taps and tapered taps like the 4-40 tap. NPT taps can be carbon . 395 300 697 241 467 796 853 990

1 4 npt thread drill size