1/2 inch OD Brass Flared Union Flare x Flare

42-8WN Brass Flare Union – 1/2" OD Tube x 1/2" OD Tube, Forged Brass Construction

The 42-8WN Brass Flared Union is a precision-machined, two-piece fitting used to connect sections of 1/2" outside diameter copper or aluminum tubing in systems requiring frequent disassembly. Constructed from forged brass and designed to meet SAE J512 standards, this union delivers a durable, mechanical seal through a 45° flare connection—eliminating the need for solder, sealant, or o-rings.

Flare unions like the 42-8WN are widely used in fuel, oil, gas, and refrigeration applications due to their resistance to vibration, thermal cycling, and high-pressure conditions. The compact profile and reusable assembly make this fitting ideal for maintenance-intensive installations or field service work.

Performance Features

• ✅ 45° Flare Joint – Provides a metal-to-metal seal that is resistant to temperature fluctuation and mechanical stress.
• ✅ Forged Brass Body – Offers excellent mechanical strength and corrosion resistance, meeting requirements for potable water and gas systems.
• ✅ Standard Tube Size Compatibility – Connects 1/2" OD tubing, compliant with ASTM B88 and B280 copper tube standards.
• ✅ Disassemblable – Allows tubing to be disconnected and reconnected without cutting or replacing pipe runs.

Technical Specifications

• Part Number: 42-8WN
• Material: Forged brass
• Connection Type: Flare x Flare (1/2" OD tubing, 45° SAE)
• Pressure Rating: Up to 600 psi (dependent on tubing and application)
• Temperature Range: -65°F to 250°F (-53°C to 121°C)
• Compliance: Lead-free compliant per NSF/ANSI 61 and 372 (suitable for potable water systems)

Installation Guidance

Ensure that the tube ends are properly flared using a 45° SAE flaring tool and are free of burrs. Tighten the flare nut onto the fitting using appropriate wrenches until resistance is met; avoid over-tightening, which can damage the flare or threads. No additional sealant is required when properly flared and torqued. Recommended for use with annealed soft copper or aluminum tubing.

Typical Applications

• Potable water distribution (lead-free compliant)
• Low-pressure natural gas and propane lines (where code allows flare fittings)
• Refrigeration and HVAC service lines
• Fuel oil distribution systems
• Instrumentation and compressed air control lines

Professional Insight

Flare connections maintain integrity in environments subject to vibration and temperature shifts, making them preferred in mechanical rooms, equipment skids, and service panels. They are a trusted alternative where soldering or heat-based joining is not desirable.

The 42-8WN Brass Flared Union delivers dependable sealing and reusability in a compact design, meeting the mechanical and safety demands of today’s commercial and industrial systems. Engineered for longevity, this fitting is built to perform in critical connections where failure is not an option.