CPV code 34321000 designates Axles and gearboxes in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
34321000 sits under 34320000 (Mechanical spare parts except engines and engine parts) and groups 2 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.