Forged Flange Hubs
Forged steel flange hubs with a raised pilot boss, produced closed-die and finish-machined to suit the mating shaft.
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Forging Parts
Forged Collars & Spacers
Forged collars and spacers that set and hold axial position on a shaft, finished to the bore tolerance you specify.
| Forging weight | 0.5 – 25 kg per part, per die set |
|---|---|
| Tolerance | ±1.5 mm as-forged; finished to ±0.05 mm after machining |
| Heat treatment | Quench and temper, normalising or annealing — to specification |
About this part
What it is and why it is made that way
Collars and spacers set the position of a gear, a bearing or a pulley along a shaft. Because they sit between two moving parts, their face runout is what actually sets the alignment — so the bore and both faces are machined in one setup. Standard clamp, set-screw and flanged styles are all produced from the same forging route.
- Bore and both faces machined in one setup
- Clamp, set-screw and flanged styles
- Optional split collar with clamping screws
- Oil groove and black oxide finish available
Materials
- C45 / 40Cr carbon steel
- 42CrMo alloy steel
- 20CrMnTi / 20CrMnMo gear steel
- Stainless 304 / 17-4PH
- Alloy steel 40CrNiMoA
Production processes
- Open-die forging
- Closed-die forging
- Hot and cold forging
- Heat treatment
- CNC finish machining
Typical applications
- Shaft spacing and location
- Bearing positioning
- Gear and pulley location
- Spacer stacks
Specification
Technical detail
The ranges below are what this shop typically holds. Anything tighter than the baseline is possible — send the drawing and we will confirm it against your specific tolerances rather than quote from a table.
| Forging weight | 0.5 – 25 kg per part, per die set |
|---|---|
| Tolerance | ±1.5 mm as-forged; finished to ±0.05 mm after machining |
| Heat treatment | Quench and temper, normalising or annealing — to specification |
| Material certification | Mill test certificate available on request |
| Forging ratio | Up to 4:1, per die set |
| Bore diameter | Ø15 – Ø200 mm, H7 standard |
| Face runout | ≤0.02 mm TIR |
| Width | To drawing, ±0.10 mm |
Material and finish are yours to choose. The lists above are the families this part is normally made in. We will not substitute a grade or change a tolerance without telling you first — and asking.
In the same process line
Other Forging parts
If this is not quite your part, these are made on the same equipment with the same inspection.
Forged Ring Flanges
Forged ring flanges with a full-length sealing face, machined flat and parallel for a reliable gasket line.
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Forged Bolt-Circle Flanges
Forged flanges with a dense bolt-hole circle, machined and faced for high-pressure bolted connections.
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Get a quote for this part
Send the drawing and we will quote it against your material, your tolerance and your quantity. One business day, in writing, with a lead time you can plan around.