JB NS4-12 3/4" SAE Flare Nut

The JB NS4-12 3/4" SAE Flare Nut is a heavy-duty, short type forged flare nut engineered for HVACR professionals who demand zero-leak reliability in high-pressure environments. Fabricated from premium high-tensile brass (65% copper, 35% zinc), this 3/4 inch flare nut effectively eliminates the porosity and seepage risks common with lower-quality cast alternatives. Designed for ACR tube fittings, it is fully compatible with copper, brass, aluminum, and steel tubing, making it a versatile choice for refrigeration systems, mini-split line sets, and hydraulic fluid transfer applications. These JB brass fittings generally conform to SAE J513 standards and are rated for pressures up to 700 PSI, ensuring structural integrity even under significant vibration and thermal stress. The forged brass construction provides superior strength for leak-proof joints in ductless mini-split installations and large-scale industrial refrigerant piping. When securing 45-degree flare connections, these short flare nuts offer a compact profile without compromising the torque required for a permanent, metal-to-metal seal.

• Forged Brass Strength: Forged construction maximizes structural density, preventing cracks and failure under high torque or internal pressure.
• Multi-Material Compatibility: Engineered for seamless use with copper, brass, aluminum, steel, and plastic tube variants.
• Standardized Precision: Manufactured to SAE J513 and ARI standards to ensure a perfect fit with standard 3/4" male flare ends.
• Corrosion Resistance: High copper content provides natural resistance to harsh refrigerants and environmental moisture.
• Vibration Tolerance: The short type design provides a secure grip that maintains its seal in systems with high compressor vibration.

Is the JB NS4-12 compatible with R-410A systems?
Yes, the forged brass design and 700 PSI pressure rating make this refrigeration flare nut suitable for high-pressure R-410A applications, provided the tubing is flared correctly to 45 degrees.

Can I use this flare nut on plastic tubing?
While compatible with plastic tubing, a proper internal support or sleeve is generally required to maintain the flare shape and prevent the 3/4 SAE nut from compressing the material over time.

Why choose a forged nut over a bar stock (long) nut?
Short type forged flare nuts like the NS4-12 are specifically designed for HVACR applications where space is limited and maximum tensile strength is required to prevent the nut from "splitting" during 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.