Parker 640F-8 Brass Flared Tube Cap 1/2 in 45 Degree

Product Description

The PARKER 640F-8 is a brass flared tube cap designed to seal the end of a 1/2-inch OD flared tube line. It uses a 45-degree SAE flare end connection and a 3/4-16 thread to create a pressure-tight closure on open tube ends. Rated to 750 psi maximum working pressure and a maximum working temperature of 250 degrees F, this cap is built for demanding service in refrigeration, HVAC, and hydraulic tubing systems. The all-brass construction resists corrosion and withstands the mechanical stress of repeated service work. Licensed HVAC technicians and plumbers use this fitting to cap off unused ports, isolate sections of a system during service, or permanently close decommissioned lines.

This cap is suited for residential and light commercial applications where SAE 45-degree flare fittings are standard. Typical installation scenarios include capping refrigerant line sets, hydraulic tubing, or fuel and oil lines during system maintenance or when a port is taken out of service. The fitting meets SAE J512 and SAE J513 standards and carries a UL Listing, making it appropriate for systems that require documented compliance. With an overall length of 0.84 inches and a weight of 0.06 pounds, it is a compact, lightweight cap that fits easily into a technician's fitting kit.

Key Features

• 45-degree SAE flare end connection for a leak-free pressure seal
• 3/4-16 thread size compatible with standard SAE flare tube fittings
• Rated to 750 psi maximum working pressure
• Maximum working temperature of 250 degrees F (121 degrees C)
• Meets SAE J512, SAE J513, and carries UL Listing
• All-brass construction for corrosion resistance and durability

Compatibility

Designed for use with 1/2-inch OD tubing using 45-degree SAE flare end connections per SAE J512 and SAE J513 standards. Suitable as an OEM-style cap fitting for refrigeration, HVAC, hydraulic, and fuel line applications requiring a 3/4-16 threaded flare cap.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber. Depressurize and isolate the line completely before removing any existing fitting or installing this cap. Hand-tighten the cap onto the flared tube end first to ensure proper thread engagement, then tighten with an appropriately sized open-end wrench — do not overtighten, as brass threads can be damaged. Verify the flare seat is clean and undamaged before assembly to ensure a leak-free seal.