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 Coupling Hubs
Forged clamping hubs that lock onto a shaft by friction, with a tapered bore finished to the shaft fit.
| 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
A clamping hub grips a shaft without keys, screws or a keyway — which means no stress concentration in the shaft and no fretting under cyclic load. The bore is tapered and finish-machined to the shaft tolerance you specify, and the taper angle is controlled so the hub grips progressively rather than binding on one side. Supplied plain or with a keyway.
- Tapered bore finish-machined to the shaft tolerance
- Plain, keyed or threaded bore options
- Shaft-friction clamping without a keyway
- Optional balancing for high-speed applications
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 couplings
- Timing pulley mounts
- Gearbox input hubs
- Machine tool spindle fittings
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 | Ø20 – Ø300 mm, to H7 or the specified fit |
| Taper angle | 1:12 to 1:20, machined to drawing |
| Taper tolerance | ±0.02 mm on the taper angle |
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.