JB NS4-4 1/4" SAE Flare Nut

For critical refrigeration and ACR connections, the JB NS4-4 1/4" SAE Flare Nut offers the structural integrity required by veteran field technicians. Unlike standard cast fittings that can develop hairline fractures under stress, this short type forged flare nut is manufactured in the USA using premium high-copper brass (65% copper, 35% zinc). This specific alloy composition provides superior tensile strength and corrosion resistance, essential for maintaining seal integrity in high-vibration environments. Designed for a 1/4" SAE connection size, it is fully compatible with copper, brass, aluminum, and steel tubing, and is rated for vacuum and high-pressure applications up to 5,000 PSI depending on conditions. Using a forged refrigeration flare nut ensures uniform wall thickness and eliminates the risk of porosity, a common failure point in lower-quality imports. These JB brass fittings conform to strict SAE J513 and AHRI standards, ensuring consistent thread engagement and a reliable metal-to-metal seal on every 45-degree flare joint.

• Forged Brass Construction: Machined from premium C360/C370 brass for maximum durability and resistance to stress-cracking.
• Engineered for Pressure: Capable of handling ACR system pressure up to 5,000 PSI, far exceeding standard field requirements.
• Broad Tube Compatibility: Suitable for use with copper, aluminum, and even plastic tubing once a proper flare is generated.
• SAE J513 Compliance: Precision-machined threads ensure perfect alignment and torque distribution with refrigeration access valves.
• Corrosion Resistance: High copper content prevents seasoning cracking and degradation in harsh industrial or marine applications.

• Can this nut be used with R-410A systems? Yes, the forged design and high-pressure rating are specifically engineered to handle the higher operating pressures of R-410A and other modern refrigerants.
• What is the benefit of a short-type nut over a long nut? Short nuts are ideal for tight clearances where space is limited; however, long nuts are often preferred in high-vibration areas to prevent fatigue at the flare.
• Is double-flaring required for this fitting? While standard flares are typical, double-flaring is recommended for extreme applications to prevent flare thinning during high-torque tightening.

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.