C250 Aluminium in Real-World Motor Housing Projects: What Buyers Should Know

When buyers and engineers ask me about
c250 aluminium, they usually mean a robust die-cast aluminum housing capable of handling thermal loads and dimensional stability in tough service. Mingda’s Aluminium Die Casting Electric Motor Housing—made in Gelan Building, No.256 Xisanzhuang Street, Shijiazhuang, Hebei, China—has been circulating in procurement chats lately, and for good reason. ISO9001-certified, shipped by ocean/land/air from Tianjin Port, productivity around 100 ton/month—those are the basics. But the story is more nuanced, and honestly, more interesting.

Industry Trends I’m Seeing

Lightweighting keeps marching on, but so does thermal density. EV auxiliaries, HVAC, pumps, and robotics want compact housings that shed heat without warping. Recycled content is becoming a line-item; several OEMs ask for 30–70% recycled aluminum, which, in fact, is realistic with die-casting feedstock. Lead time pressure hasn’t eased either—tooling speed and stable second operations are differentiators.

Core Specs (Typical, real-world values may vary)

Alloy Options	A380 / ADC12 (per ASTM B85) ≈ standard for motor housings
Dimensions	Up to ≈ 450 mm OD; wall thickness ≈ 2.5–5.0 mm
Tolerances	ISO 8062-3 CT7–CT8 (features and size dependent)
Mechanical	UTS ≈ 300–320 MPa; YS ≈ 160–180 MPa; Elongation ≈ 3–4%
Thermal Conductivity	≈ 90–110 W/m·K (A380/ADC12 range)
Surface Finish	As-cast Ra ≈ 3.2–6.3 μm; post-machining Ra ≈ 1.6 μm possible
Ingress Protection	Up to IP65 with gasketing and controlled flatness
Quality & Tests	X-ray per ASTM E155; salt spray ASTM B117 (≥ 240 h with coating)
Certification	ISO 9001:2015

Process Flow, Methods, and Testing

Material prep → high-pressure die casting → trimming/deburring → CNC of bearing seats, stator bores, and faces → optional impregnation (porosity sealing) → shot blasting/anodizing/painting → 100% dimensional checks on criticals (CMM) → leak/pressure test up to ≈ 0.5 MPa → packaging (standard export). Service life? In normal duty motors, housings like these run 10–15 years, sometimes longer, assuming thermal cycling stays within design. A quick note: customers tell me consistent flatness on mounting faces is what keeps assembly time down.

Where It’s Used (and Why)

– Industrial motors and pumps (IP55–IP65 builds).
– HVAC blowers and compressors (thermal mass matters).
– Robotics/AGV drives where stiffness-to-weight matters.
– EV auxiliaries: coolant pumps, fan drives.

The big advantage of c250 aluminium die castings is simple: density ≈ 2.7 g/cm³ with excellent castability, so you get lattice-like ribs, integrated fins, and bosses without post-weld headaches. To be honest, machining cost control is the art here—datum strategy and fixturing.

Vendor Snapshot (practical buyer view)

Vendor	MOQ	Lead Time	Certs	Notes
Mingda (Hebei, China)	≈ 300–500 pcs after PPAP	Tooling 4–6 wks; SOP ≈ 2–4 wks	ISO 9001	100 ton/month; Ocean/Land/Air via Tianjin
Regional Job Shop	Low, but price-sensitive	Varies; tooling slower	Often ISO 9001	Good for prototypes; capacity swings
Trading Company	Flexible	Depends on partner plant	Varies	Convenient comms; mixed process control

Customization and a Quick Case

Customization usually means fin geometry tuning, bolt pattern shifts, and sealing face flatness to hold IP65. Mingda’s team will tweak gate/overflow to cut porosity—sounds small, but it’s huge on leak test yield. One EU pump OEM told me their redesigned c250 aluminium housing cut mass by ≈ 18%, dropped noise by ~1.5 dB (less vibration), and improved takt by 9% after fixture redesign. Not a moonshot, but meaningful.

Final Take

If your spec calls for a robust, castable motor shell, c250 aluminium class die castings check the boxes: heat shedding, dimensional control, and friendly machining. The trick is pairing the right alloy, gating, and QA plan with real operating temperatures. Seems obvious—but the winners sweat those details.

References:

[1] ASTM B85 – Aluminum-Alloy Die Castings

[2] ISO 9001:2015 – Quality Management Systems

[3] ISO 8062-3 – Geometrical Product Specifications for Castings

[4] ASTM E155 – Radiographic Inspection Reference for Aluminum Castings

[5] ASTM B117 – Salt Spray (Fog) Testing; IEC 60034 – Rotating Electrical Machines (context for motor performance)