JB NS4-3 3/16" SAE Flare Nut

The JB NS4-3 is a 3/16" SAE flare nut designed for high-pressure HVACR refrigeration systems. Engineered with a short-type forged construction, this nut provides superior structural integrity compared to standard bar stock alternatives, minimizing the risk of stress cracking under extreme torque or vibration. It is specifically rated for compatibility with copper, brass, aluminum, and annealed steel tubing, ensuring a reliable metal-to-metal seal in critical refrigerant lines. This SAE 45-degree flare fitting is essential for technicians requiring a leak-proof connection in tight spaces where manifold or evaporator clearances are limited. With a precision-machined 3/16" flare port, it maintains consistent wall thickness to withstand the thermal expansion and contraction cycles typical in small-bore residential and commercial cooling applications. Utilizing forged brass ensures maximum corrosion resistance and durability when used with HCFC, HFC, and CO2 refrigerant systems.

• Forged Brass Strength: Superior resistance to mechanical pull-out and vibration fatigue in high-pressure lines.
• Short Pattern Design: Ideal for compact installations and tight manifold clearances.
• Broad Tube Compatibility: Validated for use with metallic and plastic tubing.
• Precision Threading: Ensures accurate 3/16" SAE fitment for leak-free refrigerant containment.

Common Questions

What is the torque specification for a 3/16" SAE flare nut?
Technicians should typically apply 8 to 10 ft-lbs of torque, ensuring a solid seal without over-compressing the flare face or stripping the threads.

Can the JB NS4-3 be used with R-410A systems?
Yes, the forged construction is designed to handle the higher operating pressures associated with R-410A refrigeration and AC circuits.

Does this fit standard refrigeration copper tubing?
This nut is designed for 3/16" OD tubing. Ensure your flaring tool is set to the correct diameter before forming the flare.

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.