MSS SP-83 | Forged Threaded / Screwed Unions | Class 3000–6000 | NPS 1/8–3
Elite provides high-quality Forged Threaded / Screwed Unions for industrial piping, process systems, oil & gas, petrochemical, chemical processing, power generation and general engineering applications. Manufactured using controlled forging and precision machining processes, these unions are designed for reliable dimensional accuracy, material integrity and long-term service performance.
Threaded / Screwed Unions consist of multiple components that allow piping sections to be connected and conveniently disconnected for maintenance, replacement or installation. The union design provides a practical alternative to permanent connections where frequent dismantling is required. Elite can supply threaded unions in carbon steel, stainless steel, alloy steel, duplex, super duplex, copper-nickel and nickel alloys.
| Standard Threaded Unions | Specialty / Material Options |
|---|---|
| Forged Threaded Union | Male × Female Threaded Union |
| MSS SP-83 Threaded Union | Class 3000 Threaded Union |
| Class 6000 Threaded Union | Stainless Steel Threaded Union |
| Carbon Steel Threaded Union | Alloy Steel Threaded Union |
| Duplex Steel Threaded Union | Super Duplex Threaded Union |
| Copper-Nickel Threaded Union | Nickel Alloy Threaded Union |
| Monel Threaded Union | Inconel Threaded Union |
| Hastelloy Threaded Union | Titanium Threaded Union |
| Heavy-Duty Threaded Union | Custom Forged Threaded Union |
| Specification | Details | |
|---|---|---|
| Product Type | Forged Threaded / Screwed Union | |
| Primary Standard | MSS SP-83 | |
| Related Standard | ASME B16.11, where applicable | |
| Thread Standard | ASME B1.20.1 / Project Specified | |
| Size Range | NPS 1/8" to 3" | |
| Pressure Classes | 3000 and 6000 | |
| Configuration | Three-Piece Union | |
| End Connection | Threaded / Screwed | |
| Thread Type | NPT or project specified | |
| Construction | Forged | |
| Components | Male End, Female End and Union Nut | |
| Seating | Integral / Metal-to-Metal Seating as applicable | |
| Surface Finish | Standard or customer specified | |
| Heat Treatment | As required by material specification | |
| Marking | Size, class, material, heat number and required identification | |
| Documentation | MTC, COC and project-required quality records | |
| Note: MSS SP-83 is the primary product standard for Class 3000 and Class 6000 forged threaded and socket-welding unions. ASME B16.11 may be referenced for applicable forged fitting requirements, while thread requirements are governed by the applicable thread standard. | ||
| Custom Requirement | Details |
|---|---|
| Nominal Size | NPS / DN or project specific |
| Pressure Class | 3000 / 6000 or project specified |
| Union Type | Male × Female / Custom |
| Material | Required material grade |
| Connection | Threaded / Screwed |
| Thread Type | NPT / Project specified |
| Seating | Standard / Project specified |
| Dimensions | Standard / Custom |
| Heat Treatment | required |
| NDE | Project specified |
| Quality Requirements | ITP / Third-party requirements |
| Marking | Customer requirements |
| Documentation | MTC / COC / Quality reports |
| Test / Examination Availability | ||
| Chemical Analysis Material dependent | ||
| Tensile & Yield Testing Material dependent | ||
| Impact Testing Where required | ||
| Hardness Testing As specified | ||
| Positive Material Identification (PMI) As specified | ||
| Dimensional Examination Standard | ||
| Ultrasonic Testing (UT) As specified | ||
| Magnetic Particle Testing (MT) | As specified | |
|---|---|---|
| Liquid Penetrant Testing (PT) | As specified | |
| Radiographic Testing (RT) | As specified | |
| Intergranular Corrosion Testing | Where applicable | |
| Pitting / Corrosion Testing | Where applicable | |
| Macro / Micro Examination | Where specified | |
| Additional Project-Specified Tests | Available | |
| Third-Party Verification | Available | |
| Material Test Certificate (MTC) | Available |
|---|---|
| EN 10204 3.1 | Available |
| EN 10204 3.2 | Where specified |
| Certificate of Conformance (COC) | Available |
| Dimensional Report | Available |
| Chemical Analysis Report | Material dependent |
| Mechanical Test Report | Material dependent |
| Heat Treatment Records | Where applicable |
| PMI Report | As specified |
| NDE Reports | As specified |
| Quality Assurance Plan (QAP) | Project specific |
| Inspection & Test Plan (ITP) | Project specific |
| Certificate of Origin | Available |
| Packing List | Available |
| Commercial Invoice | Available |
| Fumigation Certificate | Where applicable |
| Material Traceability Records | Maintained |
| Third-Party Inspection Certificate | Available |
Stainless Steel
ASTM/ASME A182 F304/F304L, F316/F316L, F304H, F316H, F316Ti, F317/F317L, F321/F321H, F347/F347H and F904L, with other stainless grades available to project requirements.
Duplex & Super Duplex
ASTM/ASME A182 F51, F53 and F55, including UNS S31803, S32205, S32550, S32750, S32760 and S32950.
Carbon Steel
ASTM/ASME A105/A105N and A350 LF2/LF3, with other project-specified carbon steel grades available where applicable.
Alloy Steel
ASTM/ASME A182 F1, F5, F9, F11, F12, F22, F23, F91 and F92, with other alloy grades available according to project requirements.
Copper-Nickel Alloys
ASTM/ASME SB111 and SB466, including UNS C70600 (90/10 Cu-Ni) and C71500 (70/30 Cu-Ni).
Nickel Alloys
Nickel 200/201, Monel 400/K500, Alloy 20, Inconel 600/601/625/825 and Hastelloy C276, including applicable ASTM/ASME specifications.
Titanium & Special Alloys
Titanium and other specialty alloys can be supplied according to customer specifications, process conditions and project requirements.
Material selection is based on operating pressure, temperature, process fluid, corrosion conditions, mechanical requirements and applicable project specifications.
Standard Threaded Union
A three-piece forged union consisting of male and female threaded ends with a union nut, designed for convenient assembly and disassembly of piping sections.
Male × Female Threaded Union
A configuration designed to connect two threaded piping components while allowing the joint to be disconnected without rotating the connected pipe.
High-Pressure Threaded Union
Forged construction suitable for high-pressure piping applications and available in Class 3000 and Class 6000 according to applicable material and design requirements.
Custom Threaded Union
Special thread configurations, dimensions, materials, seating arrangements, end connections, markings and other requirements can be supplied according to customer drawings and project specifications.
Elite’s manufacturing process can include:
Forged Threaded / Screwed Unions are commonly used in:
For quotation, provide:
Size + Pressure Class + Union Type + Material + Thread Type + Seating Requirement + Quantity + Quality Requirements
Example
2″ Class 6000 Threaded Union, MSS SP-83, ASTM A182 F316L, Forged Construction, NPT Male × Female Ends, Union Nut, Project-Specified Dimensions, EN 10204 3.1.
