B K/mueller Inds(import) 521-603HN Black Floor Flange

Product Description

The B K/MUELLER INDS(IMPORT) 521-603HN is a 1/2 inch black floor flange designed to anchor threaded pipe to a floor or wall surface. This fitting creates a stable mounting point at the base of a pipe run, distributing load and securing the pipe against lateral movement. It is a standard component in black iron pipe systems used for gas distribution, structural pipe fittings, and industrial plumbing installations. The 521-603HN is sold in a package of 10 units, making it practical for contractors completing multi-point installations or stocking service vans. Licensed plumbers and pipefitters are the primary installers.

This floor flange is suited for residential and light commercial applications where black iron pipe is the specified material. Common install scenarios include natural gas piping rough-ins, pipe railing systems, and industrial-style fixture mounting. The 1/2 inch thread size matches standard 1/2 inch black iron pipe, which is widely used in low-pressure gas and structural pipe applications. The import designation indicates this fitting is manufactured offshore and is positioned as a cost-effective option for volume installations.

Key Features

• 1/2 inch threaded inlet fits standard 1/2 inch black iron pipe
• Black finish is compatible with black iron pipe systems used in gas and structural applications
• Floor-mount design provides a stable base connection point for vertical pipe runs
• Sold in a package of 10 units for multi-point or volume installations
• Flat flange base accommodates fastening to floor or wall substrate

Compatibility

Designed as an OEM-style replacement or new-install fitting for standard 1/2 inch black iron pipe systems in residential and commercial gas piping and structural pipe applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes and IFGC requirements where gas service is involved. Shut off gas supply or isolate the pipe system completely before making any threaded connections. Use an appropriate pipe thread sealant rated for the intended service when connecting to gas lines. Secure the flange base to the substrate with fasteners appropriate for the floor or wall material before threading pipe into the fitting.