Merit Brass A635BL-20 Blind Pipe Flange 1-1/4 in Stainless

Product Description

The MERIT BRASS A635BL-20 is a blind pipe flange designed to close off the end of a 1-1/4 inch pipe. It features an outside diameter of 4-5/8 inches and is constructed from Grade 316 and 316L stainless steel, providing strong corrosion resistance in demanding environments. Rated at 150 psi, this flange is built for Class 150 piping systems where a secure, leak-tight termination is required. Plumbers, pipefitters, and mechanical contractors install this fitting in commercial and industrial plumbing, process piping, and fluid handling systems.

This blind flange is suited for use in residential and commercial piping systems where stainless steel is specified for corrosion resistance, sanitary requirements, or chemical compatibility. It fits 1-1/4 inch pipe schedules consistent with Class 150 ANSI flange standards. The 4-bolt hole pattern with 5/8 inch bolt holes on 3-1/2 inch bolt hole centers makes it straightforward to mate with matching Class 150 flanges. Typical applications include water, steam, and process fluid systems where a capped termination point is needed.

Key Features

• Grade 316 and 316L stainless steel construction for corrosion and chemical resistance
• Blind connection type seals pipe ends in Class 150 flanged systems
• 4-5/8 inch outside diameter with 4-bolt hole pattern
• 5/8 inch bolt holes on 3-1/2 inch bolt hole centers
• 150 psi pressure rating
• Circular shape consistent with standard ANSI Class 150 flange geometry

Compatibility

Designed as an OEM-style replacement and standard fitment for 1-1/4 inch Class 150 flanged piping systems using ANSI-pattern blind flanges.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable mechanical and plumbing codes. Depressurize and drain the piping system completely before removing or installing any flange. Use appropriate gasket material and fasteners rated for the system pressure and fluid type. Do not overtighten bolts unevenly — follow a cross-pattern sequence to achieve uniform gasket compression.