Parker 61VL-5 Compression Tube Nut Brass Nptf

Product Description

The PARKER 61VL-5 is a brass compression tube nut designed to secure compression-style tubing connections in hydraulic and fluid-transfer lines. It mates with a compression fitting body to grip and seal tubing at the compression interface. The nut is machined from brass, suits a 5/16 inch tube outside diameter, and uses a 9/16-24 straight thread per NPTF standards. It is rated for operating temperatures from -30 degrees F to 275 degrees F, making it suitable for a broad range of fluid system applications. Licensed plumbers, hydraulic technicians, and fluid-power mechanics are the primary installers of this component.

This compression tube nut is used in residential, commercial, and light industrial fluid systems where compression-style tubing connections are specified. It fits into applications involving pneumatic lines, hydraulic circuits, fuel systems, and instrumentation tubing. The 5/16 inch OD tube size is common in refrigeration, HVAC, and process-control tubing runs. It meets ISO 6149 and SAE J1926 standards, which makes it appropriate for systems where dimensional and pressure compliance is required.

Key Features

• Brass construction provides corrosion resistance and machinability for fluid-system environments
• Compression end connection design secures 5/16 inch OD tubing without welding or flaring
• 9/16-24 straight thread size conforms to NPTF thread standards for reliable sealing
• Meets ISO 6149 and SAE J1926 standards for dimensional and performance compliance
• Wide temperature range: -30 degrees F to 275 degrees F for versatile service conditions
• Compact overall length of 0.53 inches suits tight installation spaces

Compatibility

Designed as an OEM-style compression tube nut for fluid-transfer and hydraulic systems requiring a 5/16 inch OD compression connection with a 9/16-24 NPTF straight thread. Compatible fittings must conform to ISO 6149 or SAE J1926 dimensional standards.

Installation Notes

Installation is typically performed by a licensed plumber, hydraulic technician, or qualified fluid-power mechanic. Always depressurize and isolate the fluid system before removing or installing compression fittings. Hand-tighten the nut onto the fitting body first, then advance with a wrench to the appropriate snug-plus engagement without overtightening, which can crack the ferrule or distort the tube. Verify thread engagement and check for leaks after restoring system pressure.