Parker 4 Btx-s Steel Flared Tube Nut 1/4 in Od 37 Deg

Product Description

The PARKER 4 BTX-S is a steel flared tube nut designed for 37-degree flare end connections on 1/4-inch OD tubing. It functions as the threaded retention component in a flared tube fitting assembly, securing the flared tube end against a mating fitting seat to form a leak-resistant mechanical joint. Rated to a maximum working temperature of 500 degrees F, it is suited for hydraulic, pneumatic, fuel, and refrigeration line applications where a dependable flare connection is required. Licensed HVAC technicians, plumbers, and fluid power mechanics routinely install this hardware during line fabrication or repair work.

This tube nut is used in residential and light commercial systems wherever 37-degree SAE flare fittings are specified. Typical applications include refrigerant line sets, hydraulic tubing assemblies, fuel delivery lines, and compressed air circuits. The 37-degree flare geometry conforms to SAE J514 and ISO 8434-2, making it compatible with standard JIC and SAE flare fitting systems found across HVAC, fluid power, and plumbing installations. Overall length of 0.62 inches keeps the assembly compact in tight routing spaces.

Key Features

• 37-degree flare angle meets SAE J514, SAE 070110, and ISO 8434-2 standards
• Steel construction provides durability in high-temperature and high-pressure line applications
• Rated for service up to 500 degrees F (260 degrees C)
• 1/4-inch tube OD sizing fits standard small-diameter tubing used in HVAC and fluid systems
• Compact overall length of 0.62 inches suits confined routing environments
• Sold individually; order in multiples of 5 per manufacturer minimum order requirement

Compatibility

Designed for use with 1/4-inch OD tubing in standard 37-degree SAE JIC flare fitting assemblies conforming to SAE J514 and ISO 8434-2 specifications.

Installation Notes

Installation is performed by qualified HVAC technicians, plumbers, or fluid power mechanics. Depressurize and isolate the line completely before disassembling any flare fitting. Inspect the tube flare for cracks or out-of-round condition before threading the nut; a damaged flare will not seal reliably. Torque the nut to the fitting manufacturer's specification using a calibrated torque wrench — do not rely on feel alone on small-diameter fittings.