Merit Brass 435B-20 Blind Pipe Flange 1-1/4 in Stainless

Product Description

The MERIT BRASS 435B-20 is a blind pipe flange designed to seal off the end of a 1-1/4 inch pipe run in industrial, commercial, or mechanical piping systems. Manufactured from Grade 304 stainless steel, this flange provides reliable corrosion resistance in wet, chemical-exposure, or high-humidity environments. It carries a 150 psi pressure rating and features a 4-5/8 inch outside diameter with a circular profile. Licensed plumbers and pipefitters install this flange when a line requires permanent or temporary closure without cutting and capping. Its four-bolt-hole pattern and standard bolt hole circle dimensions make it compatible with matching Class 150 flanges in standard piping assemblies.

This blind flange is suited for residential and commercial plumbing, process piping, and mechanical systems where a 1-1/4 inch nominal pipe size termination is required. It is appropriate for water supply, low-pressure steam, and general-service liquid or gas lines operating within the 150 psi rating. The Grade 304 stainless steel construction makes it a common choice in food service, marine, and industrial environments where carbon steel flanges would corrode prematurely. Pipefitters installing this part in pressurized systems should verify the flange face type, gasket selection, and bolt specification match the mating flange.

Key Features

• Grade 304 stainless steel construction for corrosion resistance in demanding environments
• 150 psi pressure rating suitable for standard Class 150 piping systems
• 4-5/8 inch outside diameter with four bolt holes on 3-1/2 inch bolt hole centers
• 5/8 inch bolt hole diameter for standard Class 150 fastener hardware
• Blind connection type seals off pipe ends without additional fittings or caps
• Circular flange profile for uniform bolt-load distribution across the face

Compatibility

Designed as an OEM-style replacement or new-installation blind flange for 1-1/4 inch nominal pipe size Class 150 stainless steel piping systems.

Installation Notes

Installation should be performed by a licensed pipefitter or plumber in accordance with applicable plumbing and mechanical codes. Depressurize and isolate the line completely before installing or removing any flange. Use the correct gasket material for the service fluid and verify bolt torque sequence follows a cross-pattern to achieve even seating across the flange face. Do not exceed the 150 psi rated working pressure of this flange.