Parker PT-00259 Brass Male Adapter 3/8in 37 Degree Flare Nptf

Product Description

The PARKER PT-00259 is a brass flared tube male adapter designed for high-pressure hydraulic and fluid system connections. It features a 37-degree flare end on one side and a 3/8-18 NPTF male thread on the other, providing a leak-resistant metal-to-metal seal at both connections. Rated for a maximum static working pressure of 6000 psi and a maximum dynamic working pressure of 3300 psi, this fitting is built for demanding service environments. The brass construction offers good corrosion resistance and machinability. Licensed HVAC technicians, plumbers, and hydraulic system technicians install this type of adapter when transitioning between flared tubing and NPT-threaded ports on valves, manifolds, or equipment housings.

This adapter is suited for use in hydraulic lines, refrigeration and fluid transfer systems, and industrial plumbing applications where a 3/8-inch OD flared tube must connect to a 3/8-18 NPTF male port. The Flare x NPTF end configuration makes it a common choice when connecting copper or steel tubing to threaded equipment fittings. It complies with ISO 8434-2, SAE 070102, and SAE J514 standards, confirming dimensional and performance consistency across applications. Sold in a package quantity of five.

Key Features

• 37-degree flare end meets SAE J514 and ISO 8434-2 dimensional standards
• 3/8-18 NPTF thread provides a dry-seal connection without requiring sealant tape on conforming ports
• 6000 psi maximum static working pressure for high-pressure system service
• 3300 psi maximum dynamic working pressure rating
• Brass construction resists corrosion in fluid and refrigeration service
• Overall length of 1.43 inches for compact installation in tight spaces

Compatibility

Designed as an OEM-style flare-to-NPTF adapter for systems using 3/8-inch OD flared tubing and 3/8-18 NPTF threaded ports, conforming to ISO 8434-2, SAE 070102, and SAE J514 standards.

Installation Notes

Installation should be performed by a qualified technician familiar with flared tube fitting assembly and NPT thread engagement. Depressurize and isolate the system fully before removing or installing any fittings. NPTF threads are designed to seal on the threads themselves; inspect threads for damage before assembly and do not over-torque, which can crack brass fittings. Verify the mating flare nut and tube are properly formed to 37 degrees before tightening to avoid leaks at the flare seat.