CNC Machined Flanges
Flanges with drilled bolt circles and machined faces, to ANSI, DIN and JIS patterns.
Flanges where the bolt circle and the face are the whole job. Faces are turned flat in one pass so the gasket seals on a continuous surface rather than on a ridge.
How we make it: Precision CNC machining service →
3–5 weeks
5 pieces
ISO 9001:2015
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Face flatness | 0.05 | mm |
| Bolt circle | ±0.2 | mm |
| Face roughness | Ra 3.2–6.3 | µm |
| Patterns | ANSI / DIN / JIS | standards |
| Max diameter | Ø900 | mm |
| Bore tolerance | H9 | - |
Available Materials
Typical Applications
- Pipe and duct connections
- Pump suction and discharge
- Tank nozzles
- Heat exchanger spools
- Instrument connections
Surface Finishes
- Machined face (RF)
- Machined tongue and groove
- Passivate
- Zinc plating
- Painted
Industries Served
- Energy & Oil & Gas
- Chemical Processing
- Marine
- Water Treatment
- Food Processing
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 Ø900 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.
- Material
- The first material listed, Stainless Steel 316L, rates 3/10 on our machinability scale at 217 HB. On this shop's scale a harder alloy means slower passes and more tool changes, and that is cycle time the quote has to carry.
- Order size
- Minimum order is 5 pieces, so on a first order setup and programming are spread over very few parts and they are most of the price. Repeat orders at the same quantity are cheaper without anything on the drawing changing.
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
- Bore gauges and an optical comparator for hole position and edge form
The full equipment list, with counts, is on the capability page; the inspection sequence is on quality and inspection.
Questions buyers ask
- What face finish does a gasket need?
- Ra 3.2 to 6.3 µm for a sheet gasket, smoother for a spiral wound one. Too smooth and the gasket has nothing to grip; too rough and it cannot fill the grooves.
Related part families
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