Merit Brass K419-02 Pipe Locknut 1/8 in 304 Ss Threaded

Product Description

The MERIT BRASS K419-02 is a 1/8 inch pipe locknut manufactured from 304 stainless steel, designed to secure and lock threaded pipe fittings in position within a piping assembly. The locknut uses a female national pipe straight locknut (FNPSL) threaded connection and is rated to 150 psi working pressure. Measuring 21/32 inches in length and weighing 0.01 pounds, this compact hardware component meets ISO dimensional standards. It is suited for plumbing, HVAC, and light industrial piping systems where corrosion resistance and reliable thread engagement are required. Licensed plumbers and pipefitters are the primary installers for this type of component.

This locknut is appropriate for use in residential and light commercial piping systems requiring a 1/8 inch threaded connection. It is commonly installed in gas, water, or instrumentation lines where a secondary locking element is needed to prevent fitting backout or vibration-induced loosening. The 304 stainless steel construction makes it suitable for mildly corrosive environments and wet service conditions. FNPSL threading allows it to mate with standard tapered or straight-threaded male fittings in low-to-moderate pressure applications up to 150 psi.

Key Features

• 304 stainless steel construction for corrosion resistance in wet or mildly corrosive service
• FNPSL threaded connection for compatibility with standard pipe thread fittings
• 150 psi pressure rating for low-to-moderate pressure piping systems
• Meets ISO dimensional standards for consistent fit and interchangeability
• Compact 21/32 inch length suits tight installation spaces

Compatibility

Designed as an OEM-style replacement or new-installation locknut for 1/8 inch threaded pipe connections in residential and light commercial plumbing, HVAC, and instrumentation piping systems.

Installation Notes

Installation is typically performed by a licensed plumber or pipefitter. Shut off and depressurize the piping system fully before threading or removing any fittings. Use appropriate pipe wrenches or hex tools rated for the fitting size, and apply thread sealant or tape as required by local plumbing codes. Do not overtighten; follow standard trade practice for stainless steel threaded fittings to avoid galling the threads.