Merit Brass K619-12 Pipe Locknut 3/4 in 316 Ss Threaded

Product Description

The MERIT BRASS K619-12 is a 3/4 inch pipe locknut constructed from 316 stainless steel, designed to secure fittings in threaded piping systems. It features a female national pipe straight locknut (FNPSL) end connection and carries a 150 psi pressure rating. At 1-13/32 inches in length and weighing 0.13 pounds, this locknut is built for corrosive-environment applications where standard steel hardware would fail. It meets ISO standards, making it suitable for installations that require documented material traceability and dimensional conformance. Licensed plumbers and pipefitters are the primary installers of this component.

This locknut is commonly used in industrial, commercial, and marine plumbing systems where 316 stainless steel is specified for its resistance to chlorides and corrosive media. It is appropriate for use in process piping, chemical handling lines, food-grade facilities, and coastal installations. The FNPSL threading allows it to mate with straight-threaded male fittings, providing a secure mechanical lock on bulkhead-style and panel-mount piping configurations.

Key Features

• 316 stainless steel construction for superior corrosion resistance in harsh or wet environments
• FNPSL end connection for straight-thread engagement and positive mechanical locking
• 150 psi pressure rating suitable for low-to-medium pressure piping systems
• ISO standard compliance supports use in installations requiring dimensional and material documentation
• Compact 1-13/32 inch length fits tight clearance applications
• Threaded connection type allows tool-assisted installation without soldering or bonding agents

Compatibility

Designed as an OEM-style threaded locknut for 3/4 inch pipe fittings in systems specifying 316 stainless steel FNPSL hardware conforming to ISO standards.

Installation Notes

Installation is performed by licensed plumbers or pipefitters. Shut off system pressure and verify zero-pressure conditions before disassembling any piping connection. Use appropriate pipe wrenches or fitting tools sized for 3/4 inch hardware. Inspect threads for damage before installation, and do not overtighten, as stainless steel threads are susceptible to galling.