JB NS4-5 5/16" SAE Flare Nut

Industrial performance starts with high-tensile components like the JB NS4-5 5/16" SAE Flare Nut. Machined from premium C360 and C370 American-made brass, this short type forged flare nut is engineered to withstand the rigorous demands of HVACR environments where vibration and pressure fluctuations are constant. The forged brass construction significantly enhances grain structure, providing superior strength over standard bar stock to prevent cracking and ensure a leak-free flare connection.

Designed for multi-material compatibility, this fitting integrates seamlessly with copper, brass, aluminum, steel, and plastic tubing, provided a professional 45-degree flare is generated. With a robust 5,000 PSI pressure rating (depending on tubing material) and a temperature range of -65°F to 250°F, it is a reliable choice for refrigeration systems, fuel equipment, and HVAC brass fittings inventories. Precision-machined 1/2-20 threads ensure a secure fit, following strict SAE J513 and AHRI standards for professional-grade sealing.

• High-Tensile Strength: Forged brass design minimizes stress-related failures and ensures corrosion-resistant brass nut performance.
• Compact Profile: The short flare nut design allows for easier installation in tight cabinetry and manifold setups.
• Universal Compatibility: Works across diverse media, including R-410A refrigeration, LP gas, and pneumatic hydraulic systems.
• Precision Threading: Clean, accurate threads reduce the risk of cross-threading during rapid field service.

• What tube size does this flare nut fit? This is configured for 5/16" OD (Outer Diameter) tubing with a standard 1/2-20 SAE thread.
• Can this be used for high-vibration applications? While the NS4-5 is a rugged short nut, veteran techs suggest considering long nuts if vibration is an extreme factor in the specific install.
• Is this nut refrigerant compatible? Yes, the premium brass is compatible with all standard refrigerants and oils in the HVACR industry.

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.