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Credibility ,Threaded joints probably represent the oldest method of joining piping systems. Like Socket Weld fittings, threaded fittings are mainly used for small pipe diameters (Small Bore Piping); generally for piping whose nominal diameter is NPS 2 or smaller.
The dimensional standards for taper pipe threads are given in ASME B1.20.1. That document gives all required dimensions including number of threads per inch, pitch diameter, and normal engagement lengths for all pipe diameters.
All threaded fittings on this page are described, are provided with NPT thread, ASME B1.20.1. The Yaang Pipe Thread Tapered, is the best known and most widely used connection where the pipe thread provides both the mechanical joint and the hydraulic seal.
Dimensions of American Taper Pipe Thread, with Sealant Compound
DN-NPT | Major Diameter mm |
Tapping Drill Size mm |
TPI | Pitch mm |
1/16" | 7.895 | 6.00 | 27 | 0.941 |
1/8" | 10.242 | 8.25 | 27 | 0.941 |
1/4" | 13.616 | 10.70 | 18 | 1.411 |
3/8" | 17.055 | 14.10 | 18 | 1.411 |
1/2" | 21.223 | 17.40 | 14 | 1.814 |
3/4" | 26.568 | 22.60 | 14 | 1.814 |
1" | 33.228 | 28.50 | 11.5 | 2.209 |
1¼" | 41.985 | 37.00 | 11.5 | 2.209 |
1½" | 48.054 | 43.50 | 11.5 | 2.209 |
2" | 60.092 | 55.00 | 11.5 | 2.209 |
2½" | 72.699 | 65.50 | 8 | 3.175 |
3" | 88.608 | 81.50 | 8 | 3.175 |
3½" | 101.316 | 94.30 | 8 | 3.175 |
4" | 113.973 | 107.00 | 8 | 3.175 |
5" | 141.300 | 134.384 | 8 | 3.175 |
6" | 168.275 | 161.191 | 8 | 3.175 |
8" | 219.075 | 211.673 | 8 | 3.175 |
10" | 273.050 | 265.311 | 8 | 3.175 |
12" | 323.850 | 315.793 | 8 | 3.175 |
Types of Threaded Fittings by Class and Size
Description | Class Designation | ||
2000 | 3000 | 6000 | |
Elbows 45 and 90 degrees Tees, Crosses, Coupling Half-Coupling, Cap |
1/2 - 4 | 1/2 - 2 | 1/2 - 2 |
1/2 - 4 | 1/2 - 2 | 1/2 - 2 | |
1/2 - 4 | 1/2 - 2 | 1/2 - 2 | |
Pipe Wall | SCH 80 / XS | SCH 160 | XXS |
Plugs and Bushings are not identified. They may be used up through Class 6000
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Yaang Pipe Industry Co., Ltd. is an international supplier of piping solutions for flange, butt welding fittings, socket welding fittings and threaded fittings. Our products are widely used in different industrial fields, including oil and gas, chemical industry, petrochemical industry, power plant, pulp and paper industry, environmental and water conservancy engineering, engineering projects, etc.