Notched Flange Adaptors

Anyone who's tried to torque up a standard flange assembly in a confined pumping station chamber knows the frustration! The conditions engineers have to work in often involve restricted movement, misaligned bolt patterns and pipework that's been in the ground for decades!

The notched flange adaptor design that we offer here at Stainless Metric Stock addresses this directly. By allowing easier access during assembly, it simplifies bolt engagement in tight spaces and reduces the need for additional fabrication or bespoke site modifications. The result is a cleaner, faster installation with fewer variables to manage on the day.

Our flange adaptors are particularly well-suited to water treatment facilities, pumping stations, infrastructure refurbishment schemes, and reactive maintenance environments, including AMP programme delivery where programme pressures leave little margin for delay.

Reducing installation complexity has a knock-on effect across the whole project. Less time spent wrestling with a difficult assembly means shorter outage durations, lower labour costs and more predictable delivery. We know that for contractors working to tight frameworks, this really matters.

Our Notched Flange Adaptor range is stocked in the UK and available for rapid despatch, which means that your team isn't waiting on fabrication lead times when a job needs to move. Whether it's a planned refurbishment or an emergency repair, we can usually turn orders around really quickly.

Tie-flanges are used where a flanged connection needs to be made without the ability to rotate the pipe…common in retrofit situations where one or both ends of the pipework are fixed in position. In these cases, aligning bolt holes between mating flanges can be genuinely difficult, particularly in confined spaces where there's little room to manipulate the assembly.

This is where the notched design proves especially useful. The notches allow the adaptor to be positioned and adjusted independently of the pipe, giving the installer greater freedom to align bolt holes without needing to rotate or reposition fixed pipework. It removes one of the most time-consuming and frustrating aspects of tie-flange installation, and in a tight chamber or restricted access environment, that's a significant practical benefit. Combined with WRAS-approved coating, the assembly is fully compliant for potable water service from the outset.

Reducing installation complexity has a knock-on effect across the whole project. Less time spent wrestling with a difficult assembly means shorter outage durations, lower labour costs and more predictable delivery. For contractors working to tight frameworks, we know how important this is.

The Notched Flange Adaptor range that we stock here at Stainless Metric Stock runs from DN50 to DN600 across 14 sizes, covering the vast majority of pipework diameters encountered in water infrastructure work. All sizes are held at our UK warehouse and available for immediate despatch…so whether you're specifying ahead of a planned programme or responding to an unplanned failure, there's no wait on availability.

Full technical documentation is available for our Notched Flange Adaptor range, including product dimensions, pressure ratings, test data, specification guidance and installation support information.