Merit Brass 411bh-20 Half Coupling 1-1/4 in 304 Ss Fpt

Product Description

The MERIT BRASS 411bh-20 is a barstock 304 stainless steel half coupling designed for threaded pipe connections in demanding plumbing and industrial piping systems. Sized at 1-1/4 inches with female pipe thread (FPT) ends, this half coupling connects a pipe or fitting to a flat or drilled surface and carries a 1000 PSI pressure rating. The 304 stainless steel construction resists corrosion and handles a wide range of media, making it a reliable choice for water, steam, and chemical service applications where carbon steel is not suitable. At 0.74 pounds, it is a compact, durable component suited for both new installation and retrofit work.

This half coupling is used in residential and commercial plumbing, process piping, and mechanical systems where a threaded pipe connection to a vessel, tank, or header is required. The FPT thread pattern is compatible with standard NPT male-threaded pipe and fittings. It is commonly installed by licensed plumbers and pipefitters in applications requiring corrosion-resistant fittings, such as potable water systems, hydronic heating, and light industrial fluid handling.

Key Features

• 304 stainless steel barstock construction for corrosion resistance and durability
• 1000 PSI pressure rating suitable for high-pressure service
• 1-1/4 inch female pipe thread (FPT) connection, standard NPT pattern
• Half coupling profile for welding or surface-mount threaded connections
• Compact at 0.74 pounds for ease of handling and installation

Compatibility

Designed as an OEM-style replacement or new-installation fitting for 1-1/4 inch NPT threaded pipe systems using standard barstock stainless steel half couplings.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable IPC or local plumbing codes. Shut off system pressure and drain the line before removing or installing any threaded fittings. Apply an appropriate thread sealant or PTFE tape to male NPT threads before assembly. Do not overtighten FPT connections, as stainless steel threads can gall if excessive torque is applied without proper lubrication.

Technical Specifications

• Fitting Material: Stainless Steel 304
• Fitting Size: 1-1/4 inches
• Connection Type: Female Pipe Thread (FPT)
• Type: Half Coupling
• Pressure Rating: 1000 PSI
• Weight: 0.74 pounds

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: 411bh-20