Merit Brass SW3687D-04 Pipe Union 1/4 in 316 Ss Socket Weld

Product Description

The MERIT BRASS SW3687D-04 is a 1/4 inch socket weld pipe union machined from 316 stainless steel. Unions allow a pipeline to be disconnected and reconnected without disturbing adjacent piping, making them a standard component in systems that require periodic service access. This fitting is rated to 3,000 psi and uses a socket weld end connection on both sides, producing a strong, leak-resistant joint suited to high-pressure fluid and gas service. Licensed plumbers and pipefitters install this type of fitting in process, industrial, and mechanical piping systems where stainless steel is specified for corrosion resistance.

The SW3687D-04 is suited for high-pressure piping applications in industrial, commercial, and marine environments where resistance to corrosion, oxidation, and chemical exposure is required. The 316 stainless steel alloy provides superior performance in chloride-bearing environments compared to standard 304 alloys. Socket weld unions at this size are commonly found in chemical process lines, hydraulic systems, instrumentation hookups, and mechanical equipment rooms where 3,000 psi class fittings are specified by the design engineer.

Key Features

• 316 stainless steel construction for corrosion and chemical resistance
• 3,000 psi pressure rating for high-pressure service
• Socket weld x socket weld end connections on both sides
• 1/4 inch fitting size for small-bore piping runs
• Union design allows pipe disconnection without cutting or disturbing adjacent fittings

Compatibility

Designed as an OEM-style socket weld union for 1/4 inch Schedule 80 and Schedule 160 high-pressure piping systems requiring ASME B16.11 Class 3000 fittings in 316 stainless steel.

Installation Notes

Installation should be performed by a licensed pipefitter or plumber in accordance with applicable mechanical codes. Depressurize and drain the line completely before removing or installing any union fitting. Socket weld fittings require proper gap spacing between the pipe end and the socket bottom before welding, per ASME B31.3 or the governing piping code. Do not over-stress the union nut during assembly; verify alignment of mating ends before tightening.