48 NPT : Pipe and Fitting Thread Dimensions and Tolerances. All the relevant data for this tread in one spot. 4-8 NPT : Pipe and Fitting Thread Dimensions and Tolerances. 4.31875: 109.696: Tap Drill Size (T) N/A: N/A: 4-8 NPT - Internal (Fitting) Drawing. Overview Drawing. Profile Drawing. 4-8 NPT - Tolerances. Property Minimum Maximum; Thissize is just slightly larger than the minor diameter of an 1/8″ NPT thread, which is .405″. By drilling with a 27-size bit first, you can then easily tap the hole with an 1/8″ NPT tap. What Size Drill Bit for 1/8 Npt Tap . If you’re wondering what size drill bit to use for a 1/8 NPT tap, the answer is pretty simple. 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″
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.
211.5 NPT : Pipe and Fitting Thread Dimensions and Tolerances. All the relevant data for this tread in one spot. 2-11.5 NPT : Pipe and Fitting Thread Dimensions and Tolerances. Tap Drill Size (T) 2.20313: 55.96: 2-11.5 NPT - Internal (Fitting) Drawing. Overview Drawing. Profile Drawing. 2-11.5 NPT - Tolerances. Property Minimum Maximum;
ThreadMills. Pre Tap Drill Size Pipe Tap NPT & NPTF. Tap. Drill Size. Decimal Equivalent. 2 - 11-1/2. 2in 3/16. 2.1875. 1-1/2 - 11-1/2. 1 - 11-1/2. 1in 9/64. 1.1406. 3/4 - 14. 29/32. 0.9062. 1/2 - 14. 45/64. 0.7031. 3/8 - 18. 9/16. 0.5625. 1/4 - 18. 7/16. 0.4375. 1/8 - 27. Q.332. 1/16 - 27. C.242. Inch Cutting Tap. Metric Cutting Tap. Inch Todetermine the proper drill size for 75% thread on a special pitch tap use the following formula: [Major Diameter of tap, in inches] - (.975 divided by the number of Threads Per Inch) = Drill Size [in 1000ths of an inch.] EXAMPLE: To find the drill size for a 1/4-32 tap: HKUfD1n.
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    • 1 4 npt thread drill size