Die Cast Pump Housings | Hydraulic & Centrifugal

Pump housings require simultaneous pressure tightness at suction and discharge ports, precision bore concentricity for shaft and impeller sealing, smooth internal flow passages for hydraulic efficiency, and corrosion resistance to the pumped fluid. KastMfg produces pump housings in aluminum across machine sizes from 250T to 1,000T.

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Pump Housing Types

Type	Fluid	Alloy	Key Feature
Hydraulic gear pump housing	Hydraulic oil	A413	Pressure tightness, bore alignment
Centrifugal water pump housing	Water/coolant	A360	Corrosion resistance, flow geometry
Automotive coolant pump	Ethylene glycol	A380 or A360	Thermal stability, impeller bore
Oil pump housing	Engine oil	A380 or ADC12	Precision bore, pressure tightness
Vacuum pump body	Air	A380	Bore finish, sealing face
Compressor crankcase	Refrigerant	ADC12	Thermal stability, bearing alignment
Air compressor head	Compressed air	A380	Pressure tightness, valve seat

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Critical Dimensions

Feature	Specification
Shaft bore diameter	H7 or H6: +/-0.010-0.020 mm
Shaft bore roundness	0.005-0.010 mm
Port face flatness (sealing)	0.02 mm
Impeller clearance control	+/-0.05 mm
Pressure test	100% at 1.5x working pressure
Surface finish (bore)	Ra <=0.8 μm

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Alloy Recommendations

A413 + VADC: Hydraulic gear and vane pumps >100 bar -best pressure tightness, lowest internal porosity.

A360: Water and coolant pumps -corrosion resistance to treated water and coolant additives; 18% higher thermal conductivity than A380 for temperature-sensitive cooling circuit designs.

A380: General oil pumps, air compressors, low-pressure fluid service.

ADC12: Japanese OEM automotive pump programs requiring JIS material certification.

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Hydraulic Pump Requirements

Hydraulic pumps at 100-150 bar require die cast housings with:

• Pressure-tight walls (no through-porosity at rated pressure)
• Precision bore alignment for gear/vane clearance (<0.1 mm total)
• Smooth internal flow surfaces to minimize cavitation

KastMfg's solution: A413 alloy + VADC; CNC boring of gear bores in single setup; 100% pressure test at 1.5x rated pressure. See hydraulic manifold case study for production data.

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Corrosion Resistance for Water Pumps

A360 alloy (0.6% max copper) provides significantly better corrosion resistance than A380 (3.5% copper) in waterborne and coolant applications. For submersible pumps or aggressive fluid service, A360 + anodize or e-coat is standard.

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Applications

Industrial hydraulic power units -> Automotive cooling pumps -> Agricultural irrigation pumps -> HVAC and building services pumps -> Refrigeration compressors -> Oil lubrication systems

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Pump housing inquiry: casting@kastdiecast.com | +86 138 1403 4409 | No.6, Rungu Road, Nanjing, China

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