The Automotive Differential Carrier Housing is a precision structural component that encloses and supports the differential gear assembly, transmitting torque from the driveshaft to the axle shafts while allowing wheels to rotate at different speeds during turns. This component operates under high torque loads, continuous gear meshing forces, and lubrication immersion, requiring exceptional material strength, dimensional precision, and surface integrity.
Ningbo Ruican manufactures differential carrier housings using the silica sand casting process, which achieves the complex internal cavity geometry needed for gear accommodation, bearing seat alignment, and lubrication channel integration. The sand casting process produces near-net-shape parts that minimize machining stock, reduce material waste, and lower per-unit cost compared to fully machined billet alternatives.
Post-casting, each housing is machined on 5-axis CNC MACHINING centers with in-process probing to ensure bearing seat concentricity, ring gear mounting flatness, and bolt circle positional accuracy. Our IATF 16949 system governs the entire production process, with statistical process control (SPC) on critical dimensions, PPAP Level 3 submission capability, and full material traceability for automotive OEM and Tier 1 supplier requirements.
Material Specifications
Parameter Specification
Material Grade QT600-3 (Ductile Iron) / 80-55-06 (ASTM A536) / GGG60 (DIN 1693)
Alternative Material Ductile iron with annealed ferritic-pearlitic structure
Casting Process Silica sol sand casting (lost wax)
Casting Tolerance ISO 8062 CT5-CT6 (as-cast); machined to IT6-IT7
Weight Range 8–25 kg per unit
Surface Finish Ra 3.2 μm (as-cast); Ra 0.8 μm (bearing seats)
Heat Treatment Annealing / normalizing per material spec
Non-Destructive Testing Ultrasonic testing (UT) per EN 12680-2; MT per ASTM E709
Tensile Strength ≥ 600 MPa (QT600-3)
Yield Strength ≥ 370 MPa (QT600-3)
Elongation ≥ 3% (QT600-3)
Hardness 190–270 HBW
CNC Machining Details
Machining Feature Specification
Bearing Seat Diameter Custom per drawing (typ. Ø60–Ø120 mm)
Bearing Seat Tolerance K6 (machined)
Ring Gear Mounting Flatness 0.03 mm
Bearing Seat Concentricity Ø0.02 mm
Bolt Circle Position Positional tolerance 0.10 mm
Threaded Holes M8–M16 per drawing, class 6H
Surface Treatment Phosphating + oil (internal); e-coat (external)
Applications
Rear axle differential assemblies (passenger cars, light trucks)
Front axle differential housings (4WD/AWD vehicles)
Commercial vehicle drive axles
Off-highway vehicle differential units
Performance and motorsport differential carriers
Quality Assurance
IATF 16949 certified quality management system
SPC on bearing seat diameters and concentricity
CMM (Coordinate Measuring Machine) 100% inspection on critical features
PPAP Level 3 submission capability
Material test certificates (3.1 per EN 10204) with every batch
Capability for laser-etched part serialization
Call to Action
Need precision differential carriers for your axle program? Ningbo Ruican offers full DFM support, rapid prototyping, and production capacity for automotive OEM and Tier 1 suppliers. Send your drawings for a same-day engineering review.
