Merit Brass K619-02 Pipe Locknut 1/8 in 316 Ss 150 Psi

Product Description

The MERIT BRASS K619-02 is a 1/8 inch pipe locknut machined from 316 stainless steel, designed to secure threaded pipe fittings in place and prevent loosening under vibration or pressure cycling. With a 150 psi pressure rating and a female NPSL (FNPSL) threaded end connection, this locknut meets ISO standards and is suited for applications where corrosion resistance is a priority. At 21/32 inches in length and weighing just 0.01 pounds, it is a compact, precision component used by plumbers and pipefitters in industrial, marine, and chemical process piping systems.

This locknut is intended for use in threaded pipe assemblies requiring a corrosion-resistant fastening solution. The 316 stainless steel construction makes it well suited for environments exposed to moisture, mild acids, chlorides, or saltwater. Typical installation scenarios include securing pipe bushings, fittings, or conduit connectors in residential, commercial, and light industrial plumbing systems. The FNPSL thread form is commonly used in lighting fixture and conduit locknut applications as well as general pipe work.

Key Features

• 316 stainless steel construction for superior corrosion resistance in wet and chemically aggressive environments
• FNPSL threaded end connection conforms to ISO standards
• 150 psi pressure rating suitable for low-to-medium pressure pipe systems
• Compact 21/32 inch length for tight-clearance installations
• Threaded connection type allows tool-based installation without special equipment

Compatibility

Designed as an OEM-style replacement or new-installation locknut for 1/8 inch threaded pipe fittings with FNPSL end connections in plumbing and light industrial piping assemblies.

Installation Notes

Installation is typically performed by a licensed plumber or pipefitter. Shut off system pressure and drain the line before beginning any fitting work. Thread engagement should be firm and wrench-tight using an appropriate pipe wrench or spanner; avoid over-tightening stainless steel threaded components as galling can occur. Follow applicable IPC and local plumbing code requirements for pipe fitting materials and pressure ratings.