3/8" OD Brass Flared Nut

BrassCraft 41S-6 – 3/8" Flare Brass Nut for Tubing Connections

The BrassCraft 41S-6 is a 3/8" brass flare nut engineered for use in high-pressure applications where a secure mechanical seal is required. Designed for use with flared aluminum, copper, brass, or welded steel tubing, this fitting is suitable for a wide range of industrial, HVAC, and plumbing systems. The flare connection resists vibration and pullout, ensuring long-term system integrity under demanding conditions.

Product Features

• Application: For use with flared tubing in liquid or gas systems
• Material: Machined brass for corrosion resistance and durability
• Connection Type: 3/8" OD flare
• Thread: 5/8-18 straight thread
• Hex Size: 23/32 inch
• Overall Length: 0.8 inches
• Operating Temperature: -65°F to 250°F

Performance and Use

Flare fittings like the 41S-6 provide a mechanical joint capable of withstanding higher pressures than compression-type connections. The flare nut design helps reduce the risk of leaks in applications subject to vibration or thermal cycling. Commonly used in refrigeration, gas distribution, and hydronic systems, this nut delivers reliable sealing without the need for soldering or adhesives.

Installation Considerations

Proper installation requires accurate 45° flaring of the tubing and tightening to manufacturer-recommended torque specifications to ensure a pressure-tight seal. Use of appropriate tools—including flare nut wrenches and flaring tools—is essential. While installation is relatively straightforward, it should be performed by qualified personnel to meet local codes and performance expectations.

Professional Applications

• HVAC systems and gas lines requiring high-vibration resistance
• Industrial hydraulic or pneumatic systems
• Residential and commercial plumbing installations involving flared tubing