Merit Brass K611H-20 Half Coupling 1-1/4 in 316 Ss Fnpt

Product Description

The MERIT BRASS K611H-20 is a 1-1/4-inch pipe half coupling constructed from 316 stainless steel, designed for threaded piping systems where corrosion resistance and pressure integrity are required. The female NPT (FNPT) end connection accepts standard tapered pipe threads and is rated to 150 psi. At 0.3 pounds, this compact fitting is sized for residential and commercial plumbing, industrial process piping, and mechanical systems where a branch or dead-end connection must be made to an existing pipe run. Installation is performed by licensed plumbers and pipefitters working with threaded stainless steel systems.

This half coupling is suited for use in corrosive fluid service, marine environments, chemical processing lines, and potable water systems where 316 stainless steel is specified for its superior resistance to chlorides and oxidizing conditions compared to 304-grade alloys. It is also appropriate for food-service and sanitary adjacent piping applications that require stainless fittings. The FNPT threaded connection makes it compatible with standard NPT pipe and fittings without specialized tooling beyond a pipe wrench and thread sealant.

Key Features

• 316 stainless steel construction for superior corrosion resistance in chloride and chemical environments
• 1-1/4-inch FNPT end connection accepts standard tapered NPT threads
• 150 psi pressure rating for low-to-medium pressure piping systems
• Threaded assembly requires no welding or special joining equipment
• ISO standard compliance for dimensional consistency
• Lightweight at 0.3 pounds for easy handling during installation

Compatibility

Designed as an OEM-style threaded half coupling for use in 1-1/4-inch NPT stainless steel piping systems rated to 150 psi.

Installation Notes

Installation is performed by a licensed plumber or pipefitter. Depressurize and drain the system completely before making any threaded connections. Apply an appropriate thread sealant or PTFE tape to the male threads before engagement, following IPC guidelines for the fluid service involved. Do not overtighten threaded stainless fittings, as galling can occur; use a strap wrench or pipe wrench with controlled torque appropriate to the fitting size.