Galvanised Pipe and Fittings Union Nut Fig. 374

Union Pipe Fitting for Sale: Galvanized Union Nut (Fig. 374)

If you’re sourcing a union in pipe fitting for sale that can be installed quickly and disconnected for maintenance, our galvanized malleable iron union nut (Fig. 374) is built for reliable threaded connections in water, oil, gas and general industrial piping. Available from 1/8” to 6” (DN6–DN150) with common thread options and international approvals—request a quote to confirm the best configuration for your market. 

At first glance, a pipe coupling and a pipe union seem very similar. Both use a male and female threading system to connect the two pipes together. The main difference between the systems comes from the actual method of joining. Two connected pipes are screwed together directly, one inside the other. To take the pipes apart, each pipe connected to the coupling pipe needs to be rotated. In a complete piping system, this means the entire system needs to come apart to remove one pipe.

With a pipe union, the two ends of the pipe are not screwed together but are screwed into a third piece. When one pipe needs to come apart from the other, the union piece simply screws onto one of the two pipes completely. If both ends of a pipe are attached using a union, the pipe may be removed on its own without unscrewing the other pipes in the system.

Key Specifications

Tensile Strength: 350MPA 

Hardness: HB150 (Brinell) 

Elongation Rate: 17% 

A pipe union is used to connect two pipes and the connection is secure and semi-permanent. It consists of two pipes connected together via a third piece, and all three parts are threaded. The pipe unions are similar to threaded couplings, they are usually easier to remove and allow pipes of different metals to be securely connected together. This connection method is common in home and business plumbing systems.

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What is a Union Nut in Pipe Fittings?

A pipe union is designed to connect two pipe ends securely while still allowing disassembly for repairs or replacement. Unlike a standard coupling—where you often must rotate the connected pipe sections to separate the joint—a union uses a central connecting piece so the line can be disconnected with less disturbance to the surrounding piping.

The union nut is the tightening component that applies pressure to seal the union joint. In real projects, buyers often source union nuts for:

● New installations requiring detachable connections

● Maintenance stock (spare nuts for service teams)

● Replacement where only the nut is damaged but the ends are still usable

Why Buyers Choose Galvanized Threaded Unions

1) Faster maintenance, lower downtime
For lines that must be opened periodically—metering, pump rooms, equipment connections—a union fitting reduces labor and avoids dismantling large pipe runs.

2) Threaded installation (no welding)
Threaded unions are practical for small to medium systems and retrofit jobs where welding isn’t preferred.

3) Galvanized finish for harsh environments
For outdoor and humid installations, galvanized protection is often chosen to slow down corrosion. The product is noted as suitable for demanding climates (e.g., special weather environments such as Saudi Arabia).

Related Union Products (If You Need a Complete Set)

If your project needs more than the nut (complete union assemblies or different seat types), check these related items:

Flat Seat Union (Fig. 330)

Union Taper Seat (Fig. 341)

Black Union Brass Taper Seat (Fig. 342)

Galvanized pipe union

Pipe union is a type of fitting equipment designed in such a way to unite two pipes that can be separated without causing any deformation to the pipes. Any kind of small diameter pipe connection needs to be positively sealed and easy to install and remove with the help of pipe union.

Any kind of small diameter piping connections requiring a positive seal and easy assembly as well as disassembly is made with the help of pipe union. In other words, the pipe unions can easily take two pipes apart. They are widely demanded in the pipe fitting market.

Three parts of pipe union:

-A nut

-A female end

-A male end

With the joining of the female and male ends, the nuts are used to provide the necessary pressure to seal the joint. The parts of the pipe union are normally locked together by at least one radial screw or nut with a sized cross-section. When severe pulling stress is applied onto the pipe union from the outside, the locking screw breaks and removes the two parts of the union, which in turn separates together with the pipes to which they are attached. Under normal conditions elastically stressed sealing objects ensure the maintenance of water tightness between the union parts.

Different Types of Union Pipe

● Quick Connect Union Pipe:

Difference: Quick Connect Union Pipe is designed for quick installation and removal without tools.

Advantages: Suitable for applications requiring frequent replacement or maintenance, improving work efficiency.

● Flanged Union Pipe:

Difference: Uses a flanged connection, usually requiring bolts and washers.

Benefits: It provides a strong connection for high pressures, high temperatures, and environments where sealing performance is required.

● Threaded Union Pipe:

Difference: Threaded design for easy installation, no welding required.

Advantages: Suitable for small to medium-sized piping systems, it is a common and economical connection.

● Welded Union Pipe:

Difference: Requires a welded connection and provides a strong, permanent connection.

Benefits: Suitable for large diameter pipes, high pressure, and high-temperature environments with good corrosion resistance.

Coating: anti-rust oil, galvanized, electro galvanizing, epoxy coating, or as for clients' requirements.

Package: In wooded cases or pallets, or as for clients' requirements.