Rear axle performance is about more than just torque and load — air tightness plays

a key role in ensuring long-term durability and system stability.

At SiA&Jinhao, we conduct air tightness (sealing) tests on every axle before shipment.

This process helps prevent oil leakage, protects internal gears and bearings from dust and moisture,

and ensures a reliable seal that supports the long-term performance of your electric powertrain system.