1/2 inch Stainless Steel Union Female x Female

1/2 inch Stainless Steel Union – 304 Schedule 40, Threaded Ends

The 1/2 inch Stainless Steel Union is a Schedule 40 class fitting manufactured from Type 304 stainless steel and designed for use in piping systems that require periodic disassembly or service. Featuring National Pipe Taper (NPT) female threaded connections on both ends, this union allows for secure joining of pipe segments while permitting easy separation for maintenance, inspection, or system modifications.

Constructed to ASTM A182 and ASME B16.11 standards, the union offers excellent mechanical strength and corrosion resistance in a wide range of industrial and commercial applications. The three-piece design includes a threaded nut and two end bodies with matching union seats, ensuring proper alignment and sealing under moderate pressure and temperature conditions.

Technical Specifications

• ✅ Material: 304 stainless steel (ASTM A182)
• ✅ Size: 1/2 inch nominal pipe size
• ✅ Wall Rating: Schedule 40
• ✅ Connection Type: FNPT x FNPT (ANSI B1.20.1)
• ✅ Design: Three-piece union with threaded nut and matching seating surfaces
• ✅ Pressure Rating: Up to 150 PSI (non-shock service; dependent on temperature and system design)
• ✅ Temperature Range: -20°F to 400°F typical for water or air systems

Applications

This stainless steel union is typically used in systems requiring mechanical separability while maintaining system integrity. Common installations include:

• ✅ Process piping in food-grade or sanitary environments
• ✅ Chemical handling or low-pressure steam systems
• ✅ Potable and non-potable water lines
• ✅ Compressed air and instrumentation piping
• ✅ Outdoor and corrosive environments where carbon steel is not suitable

Installation Guidelines

Install using compatible NPT-threaded pipe or fittings. Apply an appropriate thread sealant such as PTFE tape or compound rated for the system’s media. Ensure threads are clean, properly aligned, and torqued per manufacturer or project specifications. Periodic re-tightening may be required for systems subject to thermal cycling or vibration.

Performance Features

• ✅ Corrosion-Resistant Alloy: Type 304 stainless steel offers strong resistance to rust, oxidation, and chemical degradation
• ✅ Mechanical Flexibility: Ideal for areas requiring repeated disassembly without pipe cutting
• ✅ Threaded Convenience: Eliminates need for welding or brazing in pressurized service applications
• ✅ Durability: Maintains integrity in high-moisture and mildly corrosive service environments

Compliance Note

This fitting meets applicable standards for mechanical piping systems and is acceptable for use under ASME B31.1 and B31.3 when installed within the limitations of its pressure class and material rating. Confirm suitability with local plumbing or mechanical code officials where applicable.

The 1/2 inch Stainless Steel Union – 304 S40 Threaded provides a high-integrity, field-serviceable connection for use in demanding mechanical and fluid handling systems. Its dimensional accuracy and corrosion resistance make it a trusted component for professional-grade installations across multiple sectors.