Merit Brass 635B-20 Blind Pipe Flange 1-1/4 in SS316

Product Description

The MERIT BRASS 635B-20 is a blind pipe flange designed to seal the end of a 1-1/4 inch pipe run and prevent flow or provide a clean termination point in a piping system. Constructed from Grade 316 stainless steel, it offers strong resistance to corrosion and is well suited for demanding fluid handling environments. The flange measures 4-5/8 inches in outside diameter with bolt holes centered 3-1/2 inches apart. Four 5/8-inch bolt holes allow secure fastening to a mating flange face. Rated at 150 psi, this component is installed by licensed plumbers and pipefitters working on commercial and industrial pipe systems.

This blind flange is appropriate for use in residential and commercial plumbing, process piping, and industrial installations where a 1-1/4 inch pipe line requires termination or isolation. The Grade 316 stainless steel construction makes it a sound choice in corrosive environments, including chemical handling, marine, and food service applications where Grade 304 may not provide adequate resistance. It installs at the end of a flanged pipe section and is bolted directly to a mating flange using standard fasteners.

Key Features

• Grade 316 stainless steel construction for superior corrosion resistance
• Rated at 150 psi for reliable pressure containment
• 4-5/8 inch outside diameter with circular profile
• Four 5/8-inch bolt holes on a 3-1/2 inch bolt hole center pattern
• Blind connection type seals pipe ends without flow-through
• Fits 1-1/4 inch nominal pipe size

Compatibility

Designed as an OEM-style replacement or new-installation blind flange for 1-1/4 inch nominal pipe size, 150-class flanged piping systems using standard bolt patterns.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable codes such as the International Plumbing Code (IPC) or relevant ASME B16 flange standards. Depressurize and isolate the pipe system completely before removing any existing flange or fitting. Use appropriate gasket material rated for the fluid type and operating pressure when mating to an opposing flange face. Torque fasteners evenly in a cross pattern to ensure a leak-free seal.