Threaded Union in standard and custom sizes to MSS SP-83. Compare quotes from verified suppliers on MetalMitra, with MTC 3.1 and worldwide delivery.
- Threaded Union
- ASME B16.11
- NPT
- BSPT
- Class 2000
- Class 3000
- Class 6000
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Specifications
| Standard | MSS SP-83 |
|---|---|
| Pressure Class | 3000 LBS |
| Size | 1/8" NB to 4" NB |
| Threads | NPT (ASME B1.20.1), BSPT, BSPP (ISO 7 / ISO 228) |
| Manufacturing | Forged & Machined |
Threaded Union for changes in direction, branching and size transitions, available on MetalMitra in standard and custom sizes to MSS SP-83, with mill-certified traceability on every lot.
Through MetalMitra you can source Threaded Union in stainless steel, carbon steel, alloy steel, duplex, nickel alloy and other grades, across a broad range of sizes and pressure ratings.
A threaded union connects two pipes with a nut and two ends, allowing quick disconnection for maintenance.
Threaded (screwed) fittings are forged fittings with internal or external pipe threads, allowing small-bore piping to be assembled and dismantled without welding. They are used in utility, instrument, air, water and low-to-medium pressure process lines.
Product range
- Elbows & Tees — 45°, 90° and street elbows, tees and crosses.
- Couplings & Unions — Full, half and reducing couplings and unions.
- Plugs & Bushings — Hex, square and round head plugs, hex bushings.
- Nipples & Caps — Hex nipples, pipe nipples and caps.
Why engineers choose it
- Quick Disconnect — No need to unscrew the whole line.
- Ground Joint — Metal-to-metal seating.
- No Welding Needed — Fast to assemble, simple to maintain.
- Accurate Threads — Threads verified with ring and plug gauges.
Threaded Union Material & Grades
| Material | Grades / Specifications |
|---|---|
| Stainless Steel | ASTM A182 / ASME SA182 F304, F304L, F304H, F310, F316, F316L, F316H, F316Ti, F321, F347, F904L |
| Duplex & Super Duplex | ASTM A182 F51, F53, F55, F60 |
| Carbon Steel | ASTM A105, A350 LF2 / LF3, A694 F42 – F70 |
| Alloy Steel | ASTM A182 F1, F5, F9, F11, F12, F22, F91 |
| Nickel Alloys | ASTM B564 – Nickel 200, Monel 400, Inconel 600/625, Incoloy 800/825, Hastelloy C276, Alloy 20 |
| Copper Nickel | ASTM B151 – Cu-Ni 90/10 (C70600), Cu-Ni 70/30 (C71500) |
Pressure Class vs Pipe Schedule
As per ASME B16.11, the pressure class of threaded fittings is matched to the wall thickness of the connecting pipe:
| Fitting Class | Matching Pipe Schedule |
|---|---|
| Class 2000 | Schedule 80 / XS |
| Class 3000 | Schedule 160 |
| Class 6000 | XXS |
Where it is used
- Utility & Air Lines
- Water Treatment
- Oil & Gas
- Chemical Processing
- Power Generation
- Instrumentation
- Hydraulics
- Fertilizer Plants
- Pharmaceutical
- Food Processing
- Fabrication
- General Engineering
Inspection & paperwork
Suppliers on MetalMitra back Threaded Union with the checks and paperwork your QA team expects.
- Dimensional inspection as per ASME B16.11
- Thread gauge inspection (NPT / BSP)
- Visual inspection
- Positive Material Identification (PMI)
- Hardness testing as applicable
- EN 10204 3.1 Mill Test Certificate
- Third-party inspection (TPI) on request
The MetalMitra advantage
- 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.
Get a quote
Tell us the specification, quantity and destination you need for Threaded Union. MetalMitra connects you with suppliers who can deliver.
Technical note: Values on this page are for reference. Always confirm against the governing standard, your purchase specification and the mill test certificate.
Applications & industries
- Utility & Air Lines
- Water Treatment
- Oil & Gas
- Chemical Processing
- Power Generation
- Instrumentation
- Hydraulics
- Fertilizer Plants
- Pharmaceutical
- Food Processing
- Fabrication
- General Engineering
- Oil & Gas
- Power Generation
- Chemical Processing
- Water & Wastewater
- Pharmaceutical
- Food & Dairy
- Fertiliser
Testing & documents
Ask for the documents you need in your requirement — suppliers confirm them in their quotation:
- Mill test certificate to EN 10204 3.1, or 3.2 with third-party witness
- Third-party inspection (TPI) by SGS, Bureau Veritas, TÜV or your nominated agency
- Tests as the standard or your order requires: hydro, PMI, IGC, NDT, hardness or impact tests
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