1-1/4 inch Black Iron Floor Flange

1-1/4 inch Black Iron Floor Flange – Built for Secure Piping Interfaces

The 1-1/4 inch Black Iron Floor Flange provides a stable anchoring point for pipe systems that require mounting to structural surfaces. Commonly used in gas, air, and low-pressure steam systems, this flange enables a rigid connection between vertical pipe runs and floors, walls, or equipment surfaces.

Manufactured from cast black malleable iron, this component is designed for durability and threaded compatibility with standard schedule 40 steel pipe. The flange features four bolt holes for secure fastening and a threaded center port to accept 1-1/4 inch NPT male pipe ends. When properly installed, it provides a strong mechanical joint with minimal risk of loosening or misalignment.

Key Performance Attributes

• ✅ Cast Malleable Iron Body – Engineered for structural integrity and impact resistance in demanding mechanical environments.
• ✅ Threaded NPT Center – Compatible with ANSI B1.20.1 threads for standard pipe joining applications.
• ✅ Four-Bolt Mounting Pattern – Offers secure attachment to base structures, minimizing movement under load.
• ✅ Corrosion-Resistant Coating – Black iron finish inhibits oxidation in dry indoor environments.

Technical Specifications

• Size: 1-1/4 inch nominal pipe size
• Connection Type: Female NPT threaded
• Material: Black malleable iron (ASTM A197/A)
• Pressure Rating: Up to 150 psi (non-shock)
• Mounting Holes: 4-hole bolt pattern
• Standards: Meets ASME B16.3 and B16.14

Installation Considerations

For best results, pair with steel pipe nipples cut to length and apply a suitable thread sealant or PTFE tape during assembly. Ensure bolts are evenly torqued when mounting to minimize flange distortion and preserve thread alignment. Use in dry or covered locations where corrosion exposure is minimal unless additional protective coating is applied.

Applications

Typically used in mechanical support for vertical piping, wall penetrations, gas system terminations, or structural fabrication. Suitable for use in residential basements, boiler rooms, workshops, and light commercial piping systems. Not intended for use in potable water or corrosive chemical environments.

Did You Know?

Unlike ductile iron, malleable iron offers excellent machinability and fine thread detail, making it an ideal choice for fittings that require consistent sealing surfaces and tight pipe engagement.

The 1-1/4 inch Black Iron Floor Flange is a dependable, code-compliant solution for mounting and securing iron piping. Designed with contractors in mind, it delivers the structural performance and dimensional accuracy required for long-term reliability in fixed plumbing applications.