A Flange Has to Match and Seal
A flange exists to join two things and, often, to seal them. So its value lives in three features: the bolt pattern (which must match the mating flange), the centre bore (which must line up with the pipe, shaft or port), and the sealing face (which must be flat for a gasket or O-ring to hold). Machined from solid, we hold all three precisely — and across a batch, so every flange is interchangeable.
Custom Flange Specifications
| Attribute | Capability |
|---|---|
| Materials | 6061 aluminium, mild & alloy steel, 304/316 stainless |
| Bolt pattern | Standard or bespoke; true position from a common datum |
| Sealing face | Flat; raised face, O-ring groove or recess on request |
| Centre bore | Bored/turned concentric to the bolt circle |
| Tolerance | ±0.025 mm on critical features; controlled flatness |
| Quantity | One-off to interchangeable batch |
Flange Types We Machine
- Pipe & port flanges — to match an existing pattern
- Shaft / bearing flanges — concentric pilots and bores
- Blind & closure flanges — sealed ends
- Adapter flanges — converting one bolt pattern to another
- Motor / pump mounting flanges — with register spigots
Matching & Sealing
Send the bolt circle diameter, hole count, hole size and centre bore — or the mating/old flange itself — and we machine a flange that bolts straight on. The sealing face is machined flat and to the finish a gasket needs, with O-ring grooves or raised faces added as required. Flatness and hole position are verified on inspection. See our bolt-pattern-matched flange batch for how we hold position across a run.
Replacing an obsolete flange? Send the old one or a rubbing/photo of the bolt pattern. We reproduce it to nominal in the right material — no drawing needed, via no-CAD ordering.
Frequently Asked Questions
Yes. Give us the bolt circle, hole count, hole size and centre bore — or send the mating/old flange — and we machine a match with holes true to position so it bolts straight on.
Yes — flat and to the gasket/O-ring finish, with O-ring grooves, raised faces or recesses as required, and consistent flatness across a batch.
6061 aluminium for light non-pressure flanges, steel for strength, 304/316 stainless for corrosion or hygiene. Material certs available.
Both — a single flange is machined from solid with no tooling; batches are made interchangeable for production or spares.
Quote a Custom Flange
Bolt pattern, drawing or sample — all accepted. Reply in 24h.