Merit Brass K619-20 Pipe Locknut 1-1/4 in 316 Ss

Product Description

The MERIT BRASS K619-20 is a 1-1/4 inch pipe locknut machined from 316 stainless steel for corrosion-resistant service in plumbing and industrial piping systems. It features a female National Pipe Straight Locknut (FNPSL) threaded end connection and carries a 150 psi pressure rating. At 2-11/64 inches in length and weighing 0.25 pounds, this locknut meets ISO standards for dimensional consistency. Licensed plumbers and pipefitters install locknuts like this to secure fittings, conduit, or pipe penetrations through panels, enclosures, and bulkheads where a tight, vibration-resistant mechanical connection is required.

This locknut is suited for residential and commercial plumbing, industrial process piping, and mechanical systems where corrosion resistance is a priority. The 316 stainless steel construction makes it appropriate for environments exposed to moisture, mild chemicals, or chlorides where carbon steel hardware would corrode prematurely. It is commonly used to lock fittings through tank walls, enclosure knockouts, and bulkhead assemblies in both wet and dry service conditions.

Key Features

• 316 stainless steel construction for superior corrosion resistance in wet and chemical environments
• FNPSL threaded end connection for secure, vibration-resistant installation
• 150 psi pressure rating suitable for standard plumbing and process applications
• ISO-compliant dimensions for consistent fitment with standard pipe components
• Compact at 2-11/64 inches length and 0.25 pounds for easy handling and inventory

Compatibility

Designed as an OEM-style replacement or new-installation locknut for 1-1/4 inch threaded pipe systems requiring an FNPSL connection in 316 stainless steel.

Installation Notes

Installation is performed by licensed plumbers or qualified pipefitters. Shut off system pressure and drain the line before removing or installing any threaded fitting. Hand-tighten the locknut onto the mating fitting threads before applying a wrench to avoid cross-threading. Refer to applicable IPC and ASME B1.20.1 thread engagement requirements for proper sealing practice.