JB NS4-10 5/8" SAE Flare Nut

The JB NS4-10 5/8" SAE Flare Nut is a high-performance short type forged flare nut engineered specifically for high-pressure HVACR environments. Manufactured in the USA from premium C360 brass, this fitting offers a high copper content (65%) to ensure superior tensile strength and a 4:1 safety factor. Unlike standard extruded alternatives, the forging process eliminates structural porosity and prevents cracking during high-torque refrigeration flare maintenance or installation on hard-to-hold gases.

Designed to provide a reliable seal with 5/8" OD tubing, this SAE 45-degree flare fitting is compatible with copper, brass, aluminum, and steel. It is optimized for use in ACR line sets, mini-slits, and pneumatic systems where a leak-proof flare connection is non-negotiable. For heavy vibration applications, ensure proper torque and consider a long-style nut if necessary. This heavy-duty 5/8" nut meets SAE J513, ASA, and ASME standards, making it the industry standard for professionals requiring durable, corrosion-resistant brass fittings.

• Forged Brass Construction: Maximizes structural integrity and prevents stress cracks compared to lower-quality extruded imports.
• Corrosion Resistance: High copper content (65% copper, 35% zinc) ensures long-term reliability in harsh industrial environments.
• Multi-Tube Compatibility: Provides a tight mechanical seal on copper, aluminum, steel, and plastic tubing once flared properly.
• Standardized Fitment: Precision-machined to SAE J513 refrigeration standards for universal compatibility with existing 5/8" flare systems.

• Is the JB NS4-10 suitable for high-pressure refrigerants? Yes, when paired with appropriate 5/8" OD tubing, these forged nuts are rated for vacuum up to 5,000 PSI, making them ideal for modern ACR systems.
• Can I use this flare nut for natural gas or propane? Absolutely. The brass forging is suitable for LP and natural gas, provided local codes are followed for flared connections.
• How do I prevent flare thinning during installation? For extreme pressure applications, technicians recommend a double flare to protect the tube wall and ensure the JB Industries flare nut maintains a secure HVAC mechanical connection.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.