inmmin mm in 102 mm 152 mm 203 mm 254 mm 305 mm 2 50 6 152 2 1/8 54 2 3/4 70 1 3/8 35 † † † † † 3 80 6 152 2 3/8 60 3 ¼ 83 1 ¾ 44 - † † † † 4 100 7 178 2 7/8 73 3 ¾ 95 1 5/8 41 - † † † † (1) X dimension is a nominal makeup dimension for layout only. Do not use for assembly dimensions. † Available from stock. 22.375 11.5 0.436 5 3 0.756 2½ 2.875 8 0.682 5½ 3 1.136 3 3.5 8 0.766 6 3 1.2 3½ 4 8 0.821 6½ 3½ 1.25 4 4.5 8 0.844 6¾ 3½ 1.3 5 5.563 8 0.937 7½ 3¾ 1.4063 Wrench makeup turns Length of. effective thread Nominal size (inside diameter) Length of engagement (tightened by hand) Actual OD Threads per inch Hand tight turns 2- 11 1/2 -32 59.3 2.33 56.4 2.22 2 1/2 - 8 -40 71.5 2.82 69.1 2.72 3 - 8 -48 87.3 3.44 84.8 3.34 NPT Threads Dimensions NPT THREAD SIZE & PITCH DASH SIZE FEMALE THREAD I.D. inch - TPI mm inch 1/8 - 27 -02 8.6 0.34 1/4 - 18 -04 11.9 0.47 3/8 - 18 -06 15.0 0.59 1/2 - 14 -08 19.1 0.75 3/4 - 14 -12 24.6 0.97 1 - 11 1/2 -16 30.5 1.20 1 1/4 - 11 1/ NPTFSAE J476, ANSI B1.20.3, FED-STD-H28/8 BSPT BS 21, ISO 7/1 BSPP BS 2779, ISO 228/1 Metric ISO 261, ANSI B1.13M, FED-STD-H28/21 UN/UNF* ANSI B1.1, FED-STD-H28/2 there are differences in the thread dimensions, pitch, and flank angle that do not allow interchangeability. NPT / NPTF Threads NPT threads, when assembled without a NOTE It is a common mistake to identify a BSPT (tapered) as an NPT. Remember that NPT threads have a 60° thread flank angle, and BSPT has a 55° angle (this can be verified with a thread gauge). Although BSP is a foreign thread, it isn't metric. This is why it comes in imperial sizes: 1/8, 1/4, 1/2, 3/4, and so on. Thread conforms to ISO 228-1 Althoughsome BSP and NPT threads might tighten and engage reasonably well, pitch and thread angle differences between them can cause spiral leakage. At 1/16, 1/8, ¼, and 3/8 sizes, pitch difference results in misalignment of the threads. This misalignment might result in the threads partially fastening. However, at 1/2 and 3/4 TheSociety of Automotive Engineers (SAE) thread standard utilizes a distinctive designation format, including nominal size and threads per inch (TPI). Common SAE thread sizes like 1/4-20, 3/8-16, and 1/2-13 cater to specific applications in EN10226 - Pipe Threads where pressure tight joints are made on the threads - Dimensions. 1 inch = 25.4 mm. Pipe thread EN10226 R 3/4. Pipe thread EN10226 Rp 3/4. Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more. Thread data - metric, unified, ACME and others. .

3 8 npt thread dimensions in mm