Socket Weld Union

Source Socket Weld Union from verified mills, manufacturers and stockists on MetalMitra. Options span standard and custom sizes, produced to MSS SP-83, and every order can ship with an EN 10204 3.1 certificate.

Through MetalMitra you can source Socket Weld Union in stainless steel, carbon steel, alloy steel, duplex, nickel alloy and other grades, across a broad range of sizes and pressure ratings.

A socket weld union joins two pipes with a threaded nut, allowing the line to be disconnected for maintenance without cutting.

Socket weld fittings are forged fittings with a socket bore into which the plain-end pipe is inserted and fillet welded. They are widely used for small-bore process, steam, instrument and hydraulic lines where a strong, leak-tight joint is needed.

What you can source

• Elbows & Tees — 45° and 90° elbows, equal and reducing tees.
• Couplings — Full, half and reducing couplings.
• Unions & Caps — Unions, caps and reducer inserts.
• Bosses — Socket weld bosses for branch connections.

Key properties

• Easy Dismantling — Nut and ends allow quick disconnection.
• Seal Options — Metal-to-metal or gasketed seats.
• Forged Strength — Dense forged grain flow for high-pressure duty.
• Easy Alignment — Socket ends hold the pipe true while welding.

Socket Weld Union Material & Grades

Pressure Class vs Pipe Schedule

As per ASME B16.11, the pressure class of socket weld fittings is matched to the wall thickness of the connecting pipe:

Applications & industries

• Oil & Gas
• Petrochemical
• Chemical Processing
• Refineries
• Power Generation
• Fertilizer Plants
• Pharmaceutical
• Marine & Offshore
• Water Treatment
• Sugar Industry
• Pulp & Paper
• Heat Exchangers
• Fabrication
• General Engineering

Testing & documentation

Inspection and documentation for Socket Weld Union follow the applicable standard plus any extra requirements in your PO.

• Dimensional inspection as per ASME B16.11
• Socket bore and depth check
• Visual inspection
• Positive Material Identification (PMI)
• Hardness testing as applicable
• EN 10204 3.1 Mill Test Certificate
• Third-party inspection (TPI) on request

Why source on MetalMitra

• Verified suppliers — Mills, manufacturers and stockists are reviewed by the MetalMitra team before they list.
• One RFQ, several quotes — Share size, grade and quantity once and compare offers side by side.
• Full traceability — Heat numbers, EN 10204 3.1 MTCs and third-party inspection on request.
• Delivered worldwide — Export-worthy packing and shipping to India, the Middle East, Africa, Europe and the Americas.

Request pricing

Post an RFQ for Socket Weld Union with your drawing or specification and receive quotes from verified suppliers.

Technical note: Values on this page are for reference. Always confirm against the governing standard, your purchase specification and the mill test certificate.