Todetermine the size of a pipe, the outside diameter of each pipe or fitting must be measured and compared to the table for size identification. For example, a 3/4" NPT pipe thread has an outside diameter of 1.050 inches. Each thread size has a defined number of threads per inch (TPI). The 3/4" NPT pipe thread has 14 threads per inch. RRc Thread Connection Conical Pipe Thread Connection According to ISO 7/1 (other common descriptions are BSPT, Kr) Male: ie. R 1/4" Female: ie. Rp 1/4" (parallel) ie. Rc 1/4" (taper) Male Thread R 1/8" R 1/4" R 3/8" R 1/2" R 3/4" Female Thread Rc 1/8" Rc 1/4" Rc 3/8" Rc 1/2" Rc 3/4" 10.2 13.6 17.2 21.7 27.1 8.3 11.0 14.5 18.0 23.5: 7.4 11.0 11 NPSFAmerican Pipe Thread ANSI B 1.20.1, American Thread, Pipe, Fitting. NPSF American Pipe Thread ANSI B 1.20.1: NPT Thread (USA) NPTF Thread (USA) NPSC Thread (USA) NPSF Thread (USA) NPSL Thread (USA) mm: Tapping Drill Size mm: TPI: Pitch mm: 1/16" - 27 NPSF: 7.582: 6.304: 27: 0.940: 1/8" - 27 NPSF: 9.929: 8.651: 27: ANSIASME B1.20.3 (NPT - National Pipe Tapered Thread) NPT size Actual Pipe O.D. (inches) Threads per Inch (also called Pitch) Length of Engagement Hand Tight Hand Tight Turns Wrench Makeup Turns Length of Effective 1-1/2” 1.900 11.5 0.420 4.50 3.25 0.724 1-47/64 2” 2.375 11.5 0.436 5 3 0.756 2-7/32 2-1/2” 2.875 8 0.682 5.50 3 1.136 2 Wealso manufacture Stainless Steel Threaded Square Plug, which is very durable and can last for many years. Our NPT Threaded Hex Head Plug can be used for heavy-duty work for an extended period. ASME B16.11 Plug Dimensions. 2 Inch Aluminum Threaded Plug. ANSI B16.11 Socket Weld Bull Plug. BS3799 Threaded Copper Plug. Technicalinformation Chart for British Pipe Thread ( Whitworth Form) -- Taper (BSPT). R-Series pipe thread and PT-Series pipe thread. 1200. Metric threads. Minimum modeled diameter (mm) Maximum modeled diameter (mm) 75% hole drill size (mm) Maximum thread depth (mm)*. M1.6 x 0.35**. 1.22. 1.32. Figure1 Figure 2 Cable Glands: NPT Threads Nuts Plastic & Metal Plastic Nuts Part Number Thread Type A mm (inches) B mm (inches) (0.28) 1 Metal Nuts Part Number Thread Type A mm (inches) B mm (inches) Figure 214M 1/4” NPT 17.5 (0.69) 3.3 (0.13) 1 238M 3/8” NPT 20.1 (0.79) 3.0 (0.12) 1 212M 1/2” NPT 28.4 (1.12) 3.3 (0.13) 2 234M 3/4 211.5 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. mm; Nominal Pipe Size (Ø) 2" Pipe Outside Diameter (D) 2.375: 60.325: Pitch (TPI) (P) 11.500: 292.1: Pitch (Distance) (P) 0.08695652: 2.209: Thread Tapper Angle TapDrill Sizes for M22. If not specified, assume a thread depth of 75%. You can learn more about thread depth in tapping here. To get the tap drill size in other depths, use our Tap Drill Size Calculator . Thread Depth. Tap Drill Size (Inch) Tap Drill Size (mm) 55%. 0.796. LZIX.