Parker 41FS-12 Brass Flared Tube Short Nut 3/4 in Od

Product Description

The PARKER 41FS-12 is a brass flared tube short nut designed to secure 45-degree flare connections in refrigeration, HVAC, and fluid system tubing assemblies. It mates with 3/4 inch OD tubing using a 1-1/16-14 UNF thread and seats against a standard 45-degree flare end to form a leak-resistant mechanical joint without the need for sealants or thread compounds. Rated to 550 psi maximum working pressure and 250 degrees F maximum working temperature, this short nut meets SAE J512 and SAE J513 standards and carries a UL Listing. HVAC technicians, refrigeration mechanics, and plumbers install this fitting when assembling or servicing flared tube connections in pressure lines and refrigerant circuits.

This short nut is suited for residential and commercial HVAC systems, refrigeration equipment, and fluid handling assemblies where 45-degree SAE flare fittings are specified. It is commonly used at service valves, expansion devices, and line set connections where a short nut profile is required to clear adjacent components. The brass construction resists corrosion in both wet and dry service environments, making it appropriate for refrigerant, water, and hydraulic fluid applications within its rated pressure and temperature limits.

Key Features

• 45-degree flare end connection conforms to SAE J512 and SAE J513 standards
• UL Listed for verified compliance in rated applications
• Rated to 550 psi maximum working pressure
• Rated to 250 degrees F (121 degrees C) maximum working temperature
• 1-1/16-14 UNF thread for positive engagement with standard flare fittings
• Short nut profile at 1.5 inches overall length reduces clearance requirements
• Brass construction resists corrosion in refrigerant and fluid service

Compatibility

Designed for use with 3/4 inch OD tubing in 45-degree SAE flare assemblies conforming to SAE J512 and SAE J513. Compatible with standard 1-1/16-14 UNF flare fittings used in HVAC, refrigeration, and fluid system applications within the rated pressure and temperature range.

Installation Notes

Installation should be performed by a qualified HVAC technician, refrigeration mechanic, or licensed plumber. Depressurize and isolate the line before disassembling or installing any flare fitting. Ensure tubing is properly flared to the correct 45-degree angle using a calibrated flaring tool before seating the nut — an improperly formed flare is the leading cause of joint leakage. Hand-tighten the nut onto the fitting body before applying final torque with an appropriately sized wrench; avoid over-tightening, which can crack the flare or distort the seating surface.