13/8 - 20 20-UN : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more Dryseal Pipe Threads (NPTF) British Pipe Threads (BSP) ACME Trapezoidal Threads; Materials Menu Toggle. (mm) es: Allowance: 0 (Ref) 0 (Ref) d: Major Diameter: 1.3669 - 1.375: 34.719 - 34.925

Thetap drill size for a 3/8 NPT thread is 0.5 inches. This means that the hole that is drilled for the thread should be 0.5 inches in diameter. It is important to ensure that the hole is the correct size in order to ensure that the thread is properly formed. When using a tap to create a 3/8 NPT thread, it is important to use the correct tap size.

Availablein tube sizes from 1/16 to 2 in. and 2 to 50 mm Straight Thread and NPT), 22 AN and AN Bulkhead Fitting, 23 10-32 Thread, M5 × 0.8 Thread, and Metric Thread (RS), 24 Features, 2 The Swagelok Tube Fitting Advantage, 6 Compliance with
Inother words the diameter that is given at a distance of 5/8" should either be added to or subtracted from 2 times the difference from 1" to 5/8" i.e. 3/8". On a taper of 2" per 12" this gives tan 4,765º = a/0.375. a is therefore tan 4.765 x 0.375 = 0,0313". This number must be multiplied by 2 and gives 0.0625". External thread (d 2)
OfPipe D. Technical Bulletin, #16 NPT Taper Pipe Thread Gages, defines the L-1 basic hand tight engagement on NPT product threads. This same L-1 length applies to NPTF threads. It is the theoretical length of assembly (hand-tight) if both parts had perfect thread form and taper and were exactly at the nominal size.
ISO261 specifies a detailed list of preferred combinations of outer diameter and pitch for ISO metric screw threads. The 1st choice column follows the R10 series from ISO 3, while the 2nd choice column is rounded off values from the R20 series from ISO 3. ISO 262 specifies a shorter list of thread dimensions - a subset of ISO 261.
Metric BSF/BSW, UNC and UNF Conversion Table. Optimas are a full-service supply chain and manufacturing solutions provider. Before you design your next product or make updates to an existing product, consider partnering with Optimas to take advantage of our many capabilities. The table below can be used to help find the nearest sized metric NPTThreads - Creating a leak free NPT connection involves the use of thread sealant tapes. National Pipe Taper Fuel (NPTF), also called Dryseal American National Standard Taper Pipe Thread, defined by ASME B1.20.3, is designed to provide a more leak-free seal without the use of PTFE tape (aka "Teflon") or other sealant compound.
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/
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    • 3 8 npt thread dimensions in mm