Cast Pump & Gearbox Housings
Sand-cast pump and gearbox housings in grey iron and alloy steel, machined on the critical faces to the drawing.
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Casting Parts
Cast Impellers & Fan Housings
Cast impellers and fan housings in cast iron and aluminium, balanced and machined to the specified hub and bore.
| Casting weight | 1 – 300 kg per part |
|---|---|
| Tolerance | ±1.5 mm as-cast; ±0.10 mm after machining |
| Casting standard | JB/T 7946 general casting tolerance |
About this part
What it is and why it is made that way
An impeller has to be balanced, and a casting is rarely symmetrical enough to balance as-cast — so it is machined, balanced and then finished. The housing is cast with the volute or scroll formed, and the bore, hub and mounting face are machined so the assembly runs true.
- Impellers dynamically balanced after machining
- Hub and bore machined to the specified fit
- Scroll and volute formed in the mould
- Balancing grade G2.5 or better on request
Materials
- Grey cast iron HT250
- Ductile iron QT500-7
- Alloy cast steel ZG270-500
- Aluminium ADC12 / A356
Production processes
- Sand casting
- Resin sand casting
- Green sand casting
- Core making
- Shot blasting
Typical applications
- Pump and fan impellers
- Blower and extractor housings
- Ventilation scroll housings
- Cooling and circulation fans
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.
| Casting weight | 1 – 300 kg per part |
|---|---|
| Tolerance | ±1.5 mm as-cast; ±0.10 mm after machining |
| Casting standard | JB/T 7946 general casting tolerance |
| Machining | Datum-based machining against customer drawings |
| Inspection | Material and dimensional report issued per heat |
| Balance grade | G2.5 standard, G1 on request |
| Hub bore | H7, to drawing |
| Casting weight | 1 – 80 kg per part |
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 Casting parts
If this is not quite your part, these are made on the same equipment with the same inspection.
Cast Brackets & Valve Bodies
Cast valve bodies and support brackets in cast iron, with the flow path cored and the sealing faces machined.
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Cast Flanges & Manifold Bodies
Cast iron flanges and manifold bodies, drilled and faced to the specified bolt pattern and pressure rating.
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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.