What is a threaded union?
A threaded union is a fitting that unites two pieces of equipment. These fittings can be attached and later detached without causing any deformation. A steel union fitting allows for easy installation, and any connection that requires a seal is done with a union fitting. The screwed union is widely used due to their economical cost and versatility. This makes it very demanding in the market. The 1 inch threaded union helps in metering and regulating devices in the plumbing industry. These unions can be coated with protective layers, as seen in the galvanized pipe union to give them better tolerances.
Threaded Union Fittings Specification And Sizes

Carbon steel union and copper to stainless steel dielectric union in Class 2000/ 3000, check ss union fitting price list in Dubai
ASME B16.11 Threaded Union Price List
Threaded Union Price Per Piece |
Screwed Union Price in USD |
Bsp Threaded Union Price in UAE Dirham |
1 Inch Galvanized 300# Malleable Iron Threaded Union Per Piece |
US $ 55.94 |
UAE Dirham 205.47 |
1/2 Inch Threaded NPT Union, Lead Free Brass, 125 PSI Per piece |
US $ 14.36 |
UAE Dirham 52.74 |
Union – 150# NPT Threaded 304 Stainless Steel 1/4 Inch Per Piece |
US $ 13.38 |
UAE Dirham 49.15 |
2 inch Ductile Iron Union NPT Threaded Class 300 Per Piece |
US $ 105.63 |
UAE Dirham 387.98 |
1-1/2 in. Threaded NPT Union 316 3000# Forged Stainless Steel Per Piece |
US $ 176.26 |
UAE Dirham 647.41 |
Please note: The price may vary as per the location, you may contact the verified manufacturers & suppliers listed on this page.
How Does A Threaded Union Work?
Because a union detaches, you can separate it and affix each half to the end of one of the pipes being joined separately. Unions, like couplings, can have slip joints for glueing or soldering or threaded inlets. After assembling the union’s two halves, connect the pipes by bringing the union together and screwing the nut on one side to the threads on the other. When fully tightened, this central connection is leakproof even without the use of plumbing tape or thread compound.
How To Install A Threaded Pipe Union?

Threaded Union can be installed as shown in above picture
Tired of buying costly forged steel union from stockists? Contact leading steel union fitting manufacturers for wholesale prices in Middle East
Various Types of Threaded Union

Threaded Unions

Threaded Union Fitting

ASME B16.11 Threaded Unions

Brass Threaded Unions

Bsp Threaded Unions

Threaded Barrel Unions

Class 3000 Threaded Unions

Copper Threaded Unions

Threaded Copper Union Fitting

Female Threaded Unions

Galvanized Threaded Unions

Mss-sp-83 Unions Threaded

Npt Threaded Unions

Reducing Threaded Unions

Stainless Steel Threaded Unions
Check galvanized pipe union & threaded union dimensions, weight, standard & isometric symbol
Threaded Union Weight

Threaded Union Connection
- MSS-SP-83 (Class Unions)
- ASME B16.39 (Malleable Iron Unions)
- ASME B16.11 (Socket Welding and Threaded),
Threaded Pipe Union Dimensions

Threaded Coupling Vs Union

- The primary distinction between a coupling and a union is that a coupling is used to connect pipe to pipe or pipe to a swedge. A union is used to join and disassemble a piping system component (such as a steam trap or control valve) for maintenance or replacement.
- The union is more expensive than the coupling. When simply joining pipes, the cheapest item should be used. When you need to disassemble the piping to remove an item, you must use the more expensive union.
- Couplings are used to connect pipe in pipe racks. To remove items for repair, use unions at the steam trap or control valve manifolds.
Available Material of Threaded Pipe Union
Stainless Steel
Pressure Class: 3000#, 6000# 9000#
Grades:
- 304
- 304L
- 316
- 316L
- 317
- 317L
- 310
- 321
- 347
- 347H
- 904L
ASTM Standard: ASTM A182
ASME Standard: ASME SA182
Mainly used in: Chemical Industry, Petroleum Industry
Duplex / Super Duplex
Pressure Class: 3000#, 6000# 9000#
Grades:
- Duplex 2205
- Super Duplex 2507
- F51
- F53
- F55
- UNS S31803
- UNS S32205
- UNS S32550
- UNS S32750
- UNS S32760
- UNS S32950
ASTM Standard: ASTM A182
ASME Standard: ASME SA182
Mainly used in: Domestic water, Cement Industries
Carbon Steel Reducing
Pressure Class: 2000 / 3000 / 6000 LBS
Grades:
- A105
- A350 LF1
- A350 LF2 CL1/CL2
- A350 LF3 CL1/CL2
- A694 F42
- A694 F46
- A694 F48
- A694 F50
- A694 F52
- A694 F56
- A694 F60
- A694 F65
- A694 F70
ASTM Standard: ASTM A105 / A350 LF2 / A694
ASME Standard: ASME SA105 / SA350 LF2 / SA694
Mainly used in: Energy Industry, Refining Industry
Alloy Steel
Pressure Class: 2000 / 3000 / 6000 LBS
Grades:
- A182 F1
- A182 F5
- A182 F9
- A182 F11
- A182 F12
- A182 F22
- A182 F91
- A182 F92
ASTM Standard: ASTM A182
ASME Standard: ASME SA182
Mainly used in: Pulp & Paper Indusry, Power Plant Industry
Copper Nickel
Pressure Class: 2000 / 3000 / 6000 LBS
Grades:
- Copper Nickel 90/10
- Copper Nickel 70/30
ASTM Standard: ASTM B467
ASME Standard: ASME SB467
Mainly used in: Oil and Gas Industry, Chemical Industry
Nickel Alloy
Pressure Class: 2000 / 3000 / 6000 LBS
Grades:
- NICKEL 200
- NICKEL 201
- MONEL 400
- MONEL K500
- INCONEL 600
- INCONEL 601
- INCONEL 625
- INCOLOY 800
- INCOLOY 800H
- INCOLOY 825
- HASTELLOY C22
- HASTELLOY C276
- HASTELLOY B2
ASTM Standard: ASTM B564
ASME Standard: ASME SB564
Mainly used in: Paper Industries, Aerospace Industry
Dielectric union stainless steel to copper, stainless steel threaded union as per ASME B16.11
Available Standards of Dielectric Union
Required tools to join dielectric unions
- Plumbers tape
- Pipe wrench
- Adjustable wrench
- Hacksaw
- Tube cutter
- Soldering torch
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