Merit Brass K619-24 Pipe Locknut 1-1/2 in 316 Ss 150 Psi

Product Description

The MERIT BRASS K619-24 is a 1-1/2 inch pipe locknut manufactured from 316 stainless steel. It is rated to 150 psi and features a female National Pipe Straight Locknut (FNPSL) end connection. Locknuts of this type are used to secure and seal pipe fittings, tank connectors, and bulkhead assemblies in piping systems where vibration or mechanical stress could loosen a standard threaded connection. The 316 stainless steel construction provides corrosion resistance in harsh or wet environments. Licensed plumbers and pipefitters are the primary installers. Overall length is 2-1/2 inches.

This locknut is suited for use in industrial, commercial, and mechanical piping systems handling water, mild chemicals, or other compatible media. The 316 stainless steel grade makes it appropriate for marine, coastal, food-service-adjacent, or chemical-process environments where standard 304 stainless or brass fittings may not offer adequate corrosion resistance. It is commonly used to secure pipe nipples or threaded stems through tank walls, panels, or manifold bodies in plumbing and process piping applications.

Key Features

• 316 stainless steel construction for superior corrosion resistance in aggressive or wet environments
• 1-1/2 inch fitting size with FNPSL end connection
• 150 psi pressure rating suitable for standard commercial and industrial piping service
• 2-1/2 inch overall length for adequate thread engagement on tank walls or panel installations
• Single-piece locknut design for straightforward installation and removal

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 1-1/2 inch FNPSL threaded piping systems in commercial and industrial plumbing applications.

Installation Notes

Installation is typically performed by a licensed plumber or pipefitter. Depressurize and drain the piping system fully before removing or installing any threaded fittings. Use an appropriate pipe wrench or spanner wrench sized for the locknut hex; avoid over-tightening, which can crack fittings or damage mating threads. Follow applicable IPC and local plumbing code requirements for material compatibility and pressure ratings in the specific service application.