Parker 640F-5 Brass Flared Tube Cap 5/16 in 45 Degree

Product Description

The PARKER 640F-5 is a brass flared tube cap designed to seal the open end of a 5/16 inch OD flared tube line. It uses a 45-degree flare seat and a 1/2-20 thread to create a leak-tight mechanical closure on refrigerant, fuel, or fluid lines. Rated to 1200 psi maximum working pressure and 250 degrees F maximum working temperature, this cap is built for demanding service environments. The all-brass construction resists corrosion and stands up to the fluids and pressures common in HVAC, refrigeration, and hydraulic applications. HVAC technicians, plumbers, and fluid power mechanics install this fitting as a temporary or permanent line cap during service, repair, or system decommissioning.

This cap is suited for use on 5/16 inch OD flared tube connections in residential and light commercial HVAC systems, refrigeration lines, and hydraulic or fuel circuits wherever a SAE 45-degree flare termination is required. It meets SAE J512 and SAE J513 standards and carries a UL Listing, making it appropriate for code-compliant installations. Typical use cases include capping off unused ports, isolating sections of a refrigerant circuit, or sealing lines during equipment changeout.

Key Features

• 45-degree flare seat conforms to SAE J512 and SAE J513 flare fitting standards
• 1200 psi maximum working pressure for reliable performance in high-pressure systems
• Rated to 250 degrees F, suitable for a wide range of fluid and refrigerant service temperatures
• All-brass construction provides corrosion resistance in refrigerant, fuel, and fluid service
• UL Listed for use in code-compliant installations
• Compact overall length of 0.62 inches for tight-space applications

Compatibility

Designed for use with 5/16 inch OD tubing terminated with a SAE 45-degree flare, conforming to SAE J512 and SAE J513 standards. Suitable for OEM-style replacement or service use on any system employing this flare standard.

Installation Notes

Installation is performed by licensed HVAC technicians, refrigeration mechanics, or qualified plumbers. Before installing or removing any flare fitting on a refrigerant or pressurized fluid line, depressurize and recover the system per applicable codes and EPA Section 608 requirements where refrigerants are involved. Hand-tighten the cap onto the flare seat first, then snug with a flare-nut wrench to avoid distorting the brass seat. Do not overtighten, as brass flare fittings are susceptible to deformation under excessive torque.