Stub Flanges

Stub Flanges are essential fittings in piping systems that demand strength, flexibility, and reliability.

Designed for pipelines that require a demountable joint, Stub Flanges allow for future disassembly, maintenance, or system upgrades. These fittings deliver a secure and effective solution, whether you’re joining pipes to valves, vessels, or different materials.

At Advanced Piping Systems, we supply high-quality Stub Flanges that make installation easier and long-term performance more dependable. Our range is ideal for applications across mining, civil construction, water treatment, industrial processing, and more.

A Stub Flange is a component used in conjunction with a backing ring or metal plate to form a flanged joint. Unlike full-face flanges, Stub Flanges are designed to be lightweight and compact. They are typically welded to the end of a pipe and used with a separate backing ring to form a complete flange assembly. This combination allows for strong tension resistance while making it easy to dismantle or reconfigure piping setups.

Stub Flanges are commonly used in systems where space, weight, or corrosion resistance is a concern. They’re particularly suited for polyethylene (PE) piping systems, making them a popular choice for projects involving HDPE pipelines.

We offer a complete range of Stub Flanges manufactured to Series 1, PN18, in accordance with Australian Standard AS/NZS 1477. Each fitting is built with precision and purpose, incorporating a galvanised metal backing ring for additional support. Our fittings eliminate the need for traditional heavy steel backing rings by replacing them with robust structural flange plates. This not only reduces weight but also improves corrosion resistance.

With more than 30 years of experience in supplying piping solutions, we understand the challenges involved in building strong and durable pipeline systems. That’s why we’ve focused on designing Stub Flanges that simplify installation, last longer, and perform under pressure.

Designed to be easier to handle and install compared to full-face steel flanges, our Stub Flanges offer lightweight construction, corrosion resistance, compliance with Australian standards, strong structural backing plates, quick installation, and are versatile across a wide range of industries, including mining, water, civil, and industrial.

Stub Flanges are used wherever there's a need to create a removable and secure pipe connection. Common applications include connecting to valves, pumps, or pressure vessels, joining HDPE or PVC pipes to other material types, creating access points for system maintenance, and installing equipment or temporary piping systems.

Because they can be quickly bolted and unbolted, Stub Flanges make maintenance faster and reduce downtime on site. The reduced weight also allows for safer handling and installation, especially in elevated or tight-access areas.

To form a connection, the Stub Flange is first welded to the pipe. A gasket is placed between the mating faces, and the backing ring is slid over the stub and bolted to the corresponding flange on the connecting pipe or equipment. The gasket provides a seal, and the bolts create the clamping force needed for a leak-free joint.

By separating the welding and bolting components, Stub Flanges allow for flexibility during assembly and make future adjustments simple.

When you need a dependable, corrosion-resistant solution for flanged joints, Advanced Piping Systems’ Stub Flanges are the smart choice. We back every product with expert support, fast delivery, and a focus on precision.

Need help choosing the right Buttweld Stub Flange? Contact our customer service team for technical advice and expertise. Are you ready to order? Add your stub flange to your quote, and we will contact you or get back to you with your quote within one business day – our team is here to help with expert guidance, product recommendations, and fast turnaround.