By Jizhong – Professional Manufacturer of Iron Pipe Fittings

Flanges may seem simple, but choosing the right one can significantly affect performance, safety, and installation success. As a trusted global supplier, Jizhong manufactures high-quality malleable iron, carbon steel, and ductile iron pipe fittings — including one of the most widely used products: the iron pipe floor flange.

From plumbing systems to structural support installations, flanges are essential components for connecting pipes, securing structures, and ensuring long-lasting stability. This guide explains the main types of flanges on the market, how they differ, and how to choose the correct style for your project.

An iron pipe floor flange is a mounting flange designed to secure pipe structures to floors, walls, or ceilings. Unlike pressure-rated flanges, floor flanges:

• Do not use a bolt-hole pattern for sealing
• Are not used for fluid transportation
• Are lighter in weight
• Are ideal for posts, supports, handrails, shelves, and industrial furniture

With durable coating and precise threading, Jizhong iron pipe floor flanges offer excellent strength for both commercial and decorative applications.

Companion flanges are used in pressure and piping applications, typically installed where systems require periodic disassembly. Main types include:

• Require no welding
• Easy to install and remove
• Common in plumbing and structural projects

• Used for sizes 6″ and below
• Built-in shoulder helps alignment
• Ideal for small-diameter piping

• Tapered hub for strong welding
• Matches pipe bevel and schedule
• Excellent for high-pressure systems

• Also known as nozzles
• Designed for boilers and pressure vessels
• Thick walls with long necks

• Solid plates used to terminate pipelines
• Reversible and suitable for future system expansion

Floor flanges play a structural—not pressure—role. Key characteristics:

• Designed for mounting, not fluid sealing
• Used for furniture, railings, posts, and construction
• Installed on floors, walls, or ceilings
• Lightweight, versatile, and easy to work with

Jizhong iron pipe floor flanges are manufactured with precision threading and corrosion-resistant coatings suitable for both indoor and outdoor projects.

• Most common type in industrial piping
• Gasket surface raised above the bolt circle
• Allows better sealing with various gasket types
• Increases pressure containment capability

• Gasket and bolt circle surface are flush
• Used for cast iron systems and low-pressure applications
• Requires full-face gaskets
• Should not be connected directly to raised face flanges

Selecting the correct flange depends on:

Is the flange meant for pressure sealing or mounting support?

Steel, iron, plastic—different connections require different flange types.

Indoor, outdoor, high-corrosion, structural, or fluid-handling applications.

Floor flanges for structural mounting; companion flanges for sealed piping systems.

For structural mounting or industrial furniture projects, the iron pipe floor flange remains the most practical and economical choice.

No. Floor flanges are for support and mounting, not for conveying fluids.

Yes. With anti-rust coatings, Jizhong floor flanges perform well outdoors.

Yes. As long as the threads match standard IPS sizes.

1/2″, 3/4″, and 1″ are most common for furniture and structural projects.

Typically malleable iron or carbon steel, depending on strength requirements.

Flanges may be simple components, but with so many variations—companion, floor, raised face, flat face—it’s important to understand their differences. The iron pipe floor flange remains one of the most versatile structural flange types, commonly used for mounting, support, and construction.

With decades of manufacturing experience, Jizhong provides reliable, globally supplied flange solutions designed for stability, safety, and long-term durability.

For any product or industry-related questions, please contact us.

Content partially reorganized based on:
Boshartu – Applications of flanges made of various materials