Threaded Fittings general
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.
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.
- Threaded piping is commonly used in low-cost, noncritical applications such as domestic water, fire protection, and industrial cooling water systems.
- Threaded fittings are normally made of cast gray or malleable iron, cast brass or bronze, or forged alloy and carbon steel.
- They are available in three pressure ratings: 2000lbs, 3000lbs and 6000lbs.
NPT Thread
All fittings on this page are described, are provided with NPT thread, ASME B1.20.1. The American National 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. NPT has a tapered male and female thread which seals with Teflon® tape or jointing compound.
Dimensions Reducing Sockolets® - 6000Lbs - MSS-SP97 -
| NPS | A | B | C | D | E | |
| 1/2 | INCH MM | 1-1/4 31.75 | 1-23/32 43.65 | 3/4 19.05 | 0.466 11.84 | 7/8 22.22 |
| 3/4 | INCH MM | 1-7/16 36.51 | 1-61/64 49.60 | 1 25.4 | 0.614 15.60 | 7/8 22.22 |
| 1 | INCH MM | 1-9/16 39.68 | 2-7/16 61.91 | 1-5/16 33.33 | 0.815 20.70 | 15/16 23.81 |
| 1¼ | INCH MM | 1-5/8 41.27 | 2-23/32 69.05 | 1-1/2 38.1 | 1.160 29.46 | 13/16 20.63 |
| 1½ | INCH MM | 1-11/16 42.86 | 3-1/4 82.55 | 1-15/16 49.21 | 1.338 33.99 | 7/8 22.22 |
| 2 | INCH MM | 2-1/16 52.38 | 4-1/32 102.39 | 2-3/4 69.85 | 1.689 42.90 | 1-3/16 30.16 |
| X = Min. 1/16 (1.6 mm) | ||||||
Dimensions Size on Size Sockolets® - 3000Lbs - MSS-SP97 -
Sockolet® Size on Size
| NPS | A | B | C | D | E | |
| 1/2 | INCH MM | 1 25.4 | 1-3/8 34.92 | 15/16 23.81 | 0.622 15.80 | 17/32 13.49 |
| 3/4 | INCH MM | 1-1/16 26.98 | 1-5/8 41.27 | 1-3/16 30.16 | 0.824 20.93 | 15/32 11.90 |
| 1 | INCH MM | 1-5/16 33.33 | 2 50.8 | 1-7/16 36.51 | 1.049 26.64 | 23/32 18.25 |
| 1¼ | INCH MM | 1-5/16 33.33 | 2-3/8 60.32 | 1-3/4 44.45 | 1.380 35.05 | 9/16 14.28 |
| 1½ | INCH MM | 1-3/8 34.92 | 2-7/8 73.02 | 2 50.8 | 1.610 40.89 | 21/32 16.66 |
| 2 | INCH MM | 1-1/2 38.1 | 3-1/2 88.9 | 2-9/16 65.08 | 2.067 52.50 | 15/16 23.81 |
| 2½ | INCH MM | 1-9/16 39.68 | 4-1/16 103.18 | 3 76.2 | 2.469 62.71 | 3/4 19.05 |
| 3 | INCH MM | 1-3/4 44.45 | 4-13/16 122.23 | 3-11/16 93.66 | 3.068 77.93 | 15/16 23.81 |
| 3½ | INCH MM | 1-11/16 42.86 | 5-3/8 136.52 | 4-7/16 112.71 | 3.548 90.12 | 11/16 17.46 |
| 4 | INCH MM | 1-7/8 47.62 | 6-1/16 153.98 | 4-3/4 120.65 | 4.026 102.26 | 1-1/16 26.98 |
| 5 | INCH MM | 2-7/16 61.91 | 7-1/4 184.15 | 5-1/4 133.35 | 5.047 128.19 | 1 25.4 |
| 6 | INCH MM | 2-11/16 68.26 | 8-11/16 220.66 | 6-1/16 153.98 | 6.065 154.05 | 1-3/16 30.16 |
| X = Min. 1/16 (1.6 mm) | ||||||
General notes:
- Bottoming Clearance - X - The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal, and to allow for differential expansion of the mating elements.
- Socket dimensions are in accordance with ASME B16.11. Design per MSS SP-97.
- Source comes from Bonney Forge (except the sizes in millimeters).
- Sockolet® is a registered name. Another often used name is Socket Weld Outlet.
