Cerrobrass NSR4-86 Brass Flared Refrigeration Nut

Product Description

The CERROBRASS NSR4-86 is a brass flared tube refrigeration nut designed to secure 45-degree flare connections on refrigerant-carrying tubing. It mates with flared copper tubing at compression ends, creating a leak-resistant mechanical joint without soldering. The nut is machined from brass for corrosion resistance and dimensional stability in refrigeration and air conditioning line sets. Tube OD compatibility is 1/2 inch by 3/8 inch. HVAC technicians and refrigeration mechanics use this fitting when assembling or servicing flare connections on refrigerant lines, service valves, and related components.

This refrigeration nut is suited for residential and light commercial HVAC and refrigeration systems where 45-degree flare fittings are specified. It is commonly installed at service valve connections, refrigerant line terminations, and anywhere a removable, pressure-rated flare joint is required. The compression-end design makes it a standard choice for field installations and service calls involving copper refrigerant tubing.

Key Features

• Brass construction for corrosion resistance and long service life in refrigeration environments
• 45-degree flare angle matches standard refrigeration and HVAC flare tooling
• Tube OD sizing: 1/2 inch by 3/8 inch for direct compatibility with common refrigerant line diameters
• Compression end connection - no soldering or brazing required at the nut interface
• Compact, single-piece design for straightforward field installation

Compatibility

Designed as an OEM-style replacement and service fitting for residential and light commercial HVAC and refrigeration systems using 45-degree flared copper tubing connections at 1/2 inch by 3/8 inch tube OD.

Installation Notes

Installation is performed by licensed HVAC technicians or refrigeration mechanics. Recover all refrigerant and depressurize the system before disassembling any flare connections. Use a calibrated flare tool to produce a clean, even 45-degree flare on the copper tubing before threading the nut. Overtightening can crack the flare or distort the seat - tighten to hand-snug and then follow standard trade practice for final torque without exceeding the fitting's design limits.