Cast Aluminium Flanges
Cast flanges with machined faces and drilled bolt circles, in standard or custom patterns.
Flanges cast with the bolt bosses formed and the face machined afterwards, which is the only way to get a gasket to seal. Bolt circles are drilled or cast, then reamed where the fit matters.
6–8 weeks
250 pieces
ISO 9001:2015
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Face flatness | 0.05 | mm |
| Bolt circle | ±0.2 | mm |
| Face roughness | Ra 3.2 | µm |
| Max diameter | Ø500 | mm |
| Wall thickness | 3.0–6.0 | mm |
| Draft | 1.5–2 | ° |
Available Materials
- A380 / ADC12
- AlSi10Mg
- LM25 (AlSi7Mg)
Typical Applications
- Duct connections
- Air intake flanges
- Pump connections
- Filter housings
- Automotive pipe flanges
Surface Finishes
- As-cast
- Shot blast
- Powder coat
- Machined face
- Anodise
Industries Served
- Automotive & EV
- Industrial Equipment
- Building Services
- Energy & Oil & Gas
- Marine
What drives the price of this part
Derived from the callouts on this page. Where a driver is not on the drawing, it is not on this list.
- Tolerance
- Face flatness at 0.05 mm is the tightest callout this family carries. Tightening a callout is a process decision, not a machining decision: below the standard ±0.005 mm the work moves to grinding or jig boring, and the price moves with it.
- Part size
- Max diameter at Ø500 mm decides which machine the part lands on and how many setups it needs. Size is the driver buyers most often leave out of a first enquiry, and it is the one that changes the quote fastest.
- Order size
- Minimum order is 250 pieces, where setup and tooling are amortised across the batch and per-part cost settles around cycle time and material. Below that quantity the same part costs more per piece, not less.
See how cycle time is calculated in the machining time calculator and what else moves a price in the cost driver reference.
How these parts are inspected
Matched to the callouts above and the instruments actually on the floor.
- Coordinate measuring machine (Zeiss CONTURA G2, two machines, GR&R 8.4% on the critical feature)
- Dimensional report against the drawing, with a 100% check on critical features rather than a sample
- Certificate of conformance and the mill certificate with every shipment
The full equipment list, with counts, is on the capability page; the inspection sequence is on quality and inspection.
Questions buyers ask
- Why machine the face on a cast flange?
- Because casting cannot hold the flatness a gasket needs. The face has to be cut after casting, and that single operation is what makes the joint seal.
Related part families
CNC Machined Flanges
Flanges with drilled bolt circles and machined faces, to ANSI, DIN and JIS patterns.
Cast Aluminium Brackets
Net-shape brackets cast in aluminium, consolidating a weldment into one part.
Aluminium Die Cast Housings
High-pressure aluminium housings from 0.5–15 kg, trimmed, machined and sealed-face checked in-house.