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A stainless steel forged threaded union is a type of pipe fitting used for joining two pipes together. It has a threaded connection on each end that can be screwed onto the corresponding threads of the pipes, providing a secure and leak-proof joint. The union is made of high-quality stainless steel to prevent rust and corrosion, making it suitable for use in harsh environments and applications where the fluid being transported may be corrosive. It is designed to be easy to install and remove, allowing for quick maintenance or replacement of the pipes without having to cut or weld them. Stainless steel forged threaded unions are widely used in various industries, including chemical processing, oil and gas, manufacturing, and food and beverage production.
Specifications of ASME B16.11 Threaded Union (Male / Female)
| Sizes | 1/8″NB TO 4″NB IN (DN6 x DN100) |
| Standards | ASME/ANSI B16.11, MSS SP-79, MSS-SP-95, 83, 97，DIN28011, DIN2617, DIN2616, DIN2615, DIN2605，EN10253-2, EN10253-1 |
| Dimensions | ASME 16.11, MSS SP-79, MSS SP-95, 83, 95, 97, BS 3799 |
| Thickness | Schedule 5S, 10S, 20S, S10, S20, S30, STD, 40S, S40, S60, XS, 80S, S80, S100, S120, S140, S160, XXS and etc. |
| Pressure Class | 2000LBS,3000 LBS, 6000 LBS, 9000 LBS |
| From | Forged Threaded / Screwed Union, Male X Female Threaded Union |
| Grades&Materials | ASTM / ASME A/SA 182 – F 304, 304L, 304H, 309S, 309H, 310S, 310H, 316, 316TI, 316H, 316L, 316LN, 317, 317L, 321, 321H, 347, 347H, 904L.ASTM / ASME A/SA 182 – F44, F45, F51, F53, F55, F60, F61.ASTM / ASME SB 564 / 160 / 472 – UNS 2200 (NICKEL 200), UNS 4400 (MONEL 400), UNS 8825 INCONEL (825), UNS 6600(INCONEL 600), UNS 6601 (INCONEL 601), UNS 6625 (INCONEL 625), UNS 10276 (HASTELLOY C 276), UNS 2201 (NICKEL 201), (ALLOY 20 / 20 CB 3)，ASTM / ASME SB 61 / 62 / 151 / 152 – UNS NO. C 92200, UNS NO. C 83600, UNS NO. 70600, 71500, C 70600 (CU -NI- 90/10), C 71500 (CU -NI- 70/30), UNS NO C 10100, C 10200, C 10300, C 10800, C 12000, C 12200，ASTMA 105/A694/ A350 LF3/A350 LF2 – F42, F46, F52, F56,F60, F65, F70， ASTM A182 – F1, F5, F9, F11, F22, F91，Brass CA 360, CA 345 and CA 377 / SAE J530, SAE J531 and ASA |
| Type | Socket Weld (S/W) & SCREWED (SCRD) – NPT, BSP, BSPT |
Manufacturing Standards of Threaded Union
| ASME Standard | ASME/ANSI B16.11, MSS SP-79, MSS-SP-95, 83, 97 |
| DIN Standard | DIN28011, DIN2617, DIN2616, DIN2615, DIN2605 |
| EN Standard | EN10253-2, EN10253-1 |
| ASME B16.11 | Threaded |
| ASTM A182 – ASME SA182 | Standard Specification for Wrought Austenitic SS Piping Threaded Fittings |
| MSS SP-95 | Threaded Full Union |
ASME / ANSI B16.11 Threaded Union Material & Grades
| Stainless Steel Threaded Union |
| ASTM A403 WP Gr. 304, 304L, 304H, 310, 316, 316L, 316H, 316Ti, 317L, 321, 347, 904L |
| Carbon Steel Threaded Union |
| ASTM A234 WPB, WPBW, WPHY 70, WPHY 65, WPHY 60, WPHY 52, WPHY 46, & WPHY 42. |
| Low Temperature Threaded Union |
| ASTM A420 WPL6, ASTM A420 WPL3 |
| Alloy Steel Threaded Union |
| ASTM / ASME A/SA 234 Gr. WP1, WP5, WP9, WP11, WP12, WP22, WP91 |
| Duplex & Super Duplex Steel Threaded Union |
| ASTM A815, ASME SA815 UNS NO S31803, UNS NO S32205, UNS S32750, UNS S32950. Werkstoff No. 1.4462 |
| Nickel Alloy Threaded Union |
| UNS 10276 (HASTELLOY C 276), UNS 6625 (INCONEL 625), UNS 6601 (INCONEL 601), UNS 6600 (INCONEL 600), UNS 8825 (INCONEL 825), UNS 8020 (ALLOY 20 / 20 CB 3), UNS 4400 (MONEL 400), UNS 2201 (NICKEL 201), ASTM / ASME SB 336 UNS 2200 (NICKEL 200) |
High Pressure Threaded Union Types by Size, Class, and Wall Thickness
| Description | Class Designation | ||
| 2000 | 3000 | 6000 | |
| Threaded Union | 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 |
Threaded Union Dimensions
Stainless Steel Casting Threaded Union Dimensions
| DIMENSIONS OF THREADED UNION (BS3799) (in mm) | ||||||||||||
| Nom. Pipe Size | Pipe End Min | Socket Bore Dia. | Socket Wall Min. | Water Way Bore | Laying Length | Male Flange Min. | Nut Min. | Threads Per 25.4 Max | Bearing Min. | Depth of Socket Min. | Length Assem. Nominal | Clear Assem. Nut |
| A | B | C | D | E | F | G | H | J | K | L | N | |
| 1/8 | 21.8 | 10.92
10.67 |
3.17 | 6.83
6.43 |
22.4
19.0 |
3.17 | 3.17 | 16 | 1.24 | 9.6 | 41.1 | 49.0 |
| ¼ | 21.8 | 14.22
13.97 |
3.30 | 9.85
9.45 |
22.4
19.0 |
3.17 | 3.17 | 19 | 1.24 | 9.6 | 41.4 | 49.0 |
| 3/8 | 25.9 | 17.78
17.53 |
3.48 | 13.92
13.51 |
26.9
20.6 |
3.43 | 3.43 | 14 | 1.37 | 9.6 | 46.0 | 55.0 |
| ½ | 31.2 | 21.84
21.59 |
4.06 | 17.47
17.07 |
26.9
20.6 |
3.68 | 3.68 | 14 | 1.50 | 9.6 | 49.0 | 57.0 |
| ¾ | 37.1 | 27.18
26.92 |
4.27 | 21.79
21.39 |
31.8
25.4 |
4.06 | 4.06 | 11 | 1.68 | 12.7 | 56.9 | 67.0 |
| 1 | 45.5 | 34.04
33.78 |
4.95 | 28.14
27.74 |
34.3
26.2 |
4.57 | 4.44 | 11 | 1.85 | 12.7 | 62.0 | 79.0 |
| 11/4 | 54.9 | 42.67
42.42 |
5.28 | 35.76
35.36 |
40.6
32.5 |
5.33 | 5.21 | 11 | 2.13 | 12.7 | 71.1 | 94.0 |
| 11/2 | 61.5 | 48.77
48.51 |
5.54 | 41.61
41.20 |
42.2
34.0 |
5.84 | 5.59 | 10 | 2.31 | 12.7 | 75.5 | 111.0 |
| 2 | 75.2 | 61.47
61.21 |
6.05 | 52.53
52.12 |
45.3
37.3 |
6.60 | 6.35 | 10 | 2.69 | 15.8 | 86.1 | 132.0 |
| 21/2 | 91.7 | 74.17
73.66 |
7.65 | 64.72
64.31 |
61.7
52.1 |
7.49 | 7.11 | 8 | 3.07 | 15.8 | 102.4 | 148.0 |
| 3 | 109.2 | 90.17
89.66 |
8.31 | 77.67
77.27 |
63.8
53.6 |
8.25 | 8.00 | 8 | 3.53 | 15.8 | 109.0 | 175.0 |
ASME B16.11 Threaded Pipe Union Weight
| H-Thrd’s | |||||||||
| Minimum 4 Full Thrd’s Engagement Class 2A/2B Fit   ASME B16.11 Threaded Pipe Union Weight(1) ANSIB1.1 |
|||||||||
| Nom. Pipe Kích cỡ |
Pipe End | Wal | Water Way Bore |
Male Flange |
Nut | Threads Per 25.4mm |
Bearing | Length Assem Nom. |
Clear Assem. Nut |
| Min.A | Min. C | D | Min.F | Min.G | Max. H | Min.J | L | N | |
| 1/8″ | 14.7 | 2.41 | 8.43 6.43 |
3.18 | 3.18 | 16 | 1.24 | 41.4 | 50.8 |
| 1/4″ | 19.0 | 3.02 | 11.13 9.45 |
3.18 | 3.18 | 16 | 1.24 | 41.4 | 50.8 |
| 3/8″ | 22.9 | 3.20 | 14.27 13.51 |
3.43 | 3.43 | 14 | 1.37 | 46.0 | 55.9 |
| 1/2″ | 27.7 | 3.73 | 17.86 17.07 |
3.68 | 3.68 | 14 | 1.50 | 49.0 | 58.4 |
| 3/4* | 33.5 | 3.91 | 23.01 21.39 |
4.06 | 4.06 | 11 | 1.68 | 56.9 | 66.0 |
| 1′ | 41.4 | 4.55 | 28.98 27.74 |
4.57 | 4.45 | 11 | 1.85 | 62.0 | 78.7 |
| 1-1/4″ | 50.5 | 4.85 | 37.69 35.36 |
5.33 | 5.21 | 11 | 2.13 | 71.1 | 94.0 |
| 1-1/2″ | 57.2 | 5.08 | 43.54 41.20 |
5.84 | 5.59 | 10 | 2.31 | 76.5 | 111.8 |
| 2* | 70.1 | 5.54 | 55.58 52.12 |
6.60 | 6.35 | 10 | 2.69 | 86.1 | 132.1 |
| 2-1/2″ | 85.3 | 7.01 | 66.27 64.31 |
7.49 | 7.11 | 8 | 3.07 | 102.4 | 149.9 |
| 3′ | 102.4 | 7.62 | 88.25 77.27 |
8.26 | 8.00 | 8 | 3.53 | 109.0 | 175.3 |
| 1) Dimensions in Millimeters. | |||||||||
| (2)Upper and lower values for each size are the respective maximum and minimum dimensions. | |||||||||
Angularity Tolerance of Forged Threaded Union
| ND | Max off angle | Max off plane |
| Q | P | |
| 1/2 a 4 | 1 | 2 |
| 5 a 8 | 2 | 4 |
| 10 a 12 | 3 | 5 |
| 14 a 16 | 3 | 7 |
| 18 a 24 | 4 | 10 |
| 26 a 30 | 5 | 10 |
| 32 a 42 | 5 | 13 |
| 44 a 48 | 5 | 20 |
Available Types of ASME B16.11 Threaded Union
| Stainless Steel Screwed Union | SS Forged Threaded Union |
| ANSI B16.11 Forged Threaded Unions | BS 3799 Forged Screwed Union |
| Forged Threaded Union | Threaded Forged Union |
| Carbon Steel Threaded Unions | High Quality Threaded Union |
| Forged Threaded Union | Forged Screwed Unions |
| 150 lb. Threaded Fittings Union | Threaded Forged Union |
| ASME B16.11 Forged Threaded Unions | Forged Union 3000LB Threaded |
| ASTM A182 Threaded Stainless Steel Unions | Duplex Steel Threaded Union |
| Super Duplex Steel Screwed Union | Copper Nickel Threaded Union |
| High Nickel Alloy Forged Threaded Union | Hastelloy Screwed Union |
| Titanium Forged Threaded Unions | Inconel Threaded Unions |
Threaded Union Applications
- Stainless Steel Forged Threaded Union uses in Oil and Gas Pipeline
- Forged Threaded Union uses in Chemical Industry
- Alloy Steel Threaded Union uses in Plumbing
- Forged Screwed Union uses in Heating
- Threaded Forged Union uses in Water Supply Systems
- ANSI B16.11 Forged Threaded Union uses in Power Plant
- Threaded Union uses in Paper & Pulp Industry
- Forged Screwed Union uses in General Purpose Applications
- Forged Threaded Union uses in Fabrication Industry
- Forged Screwed Union uses in Food Processing Industry
- Forged Threaded Union uses in Structural Pipe
