CN code 841221 covers hydraulic power engines and motors with linear action, commonly known as hydraulic cylinders. This subheading includes single-acting and double-acting hydraulic cylinders, telescopic cylinders, single-rod and double-rod cylinders, and other actuators converting hydraulic fluid pressure energy into linear motion. Hydraulic cylinders are used in construction machinery (excavators, loaders, bulldozers), industrial machinery (presses, injection moulding machines, machine tools), lifting equipment (cranes, hydraulic lifts, platforms), special vehicles and industrial installations. Classification is based on the hydraulic operating principle and linear output motion. Pneumatic linear actuators are classified under 841231.

Importing hydraulic actuators under subheading 841221 into the EU is governed by the Union Customs Code and technical regulations. The Machinery Regulation (EU) 2023/1230 applies when the actuator is a machine component. PED 2014/68/EU applies to components operating above pressure thresholds. Hydraulic cylinders must comply with EN ISO standards for strength, tightness and safety. Importers must hold an EORI number. Documentation includes a commercial invoice, transport document, technical specification with parameters (bore, stroke, working pressure) and material certificates. REACH applies to substances in seals and hydraulic fluids. Duty rates should be verified in TARIC. Import of hydraulic cylinders from China is significant in the EU market.

Linear hydraulic actuators under subheading 841221 are fundamental components in drive systems across many industries. In construction, hydraulic cylinders drive excavator arms and buckets, loader arms, bulldozer blades and crane booms. In metalworking, cylinders are used in hydraulic presses with forces from a few to tens of thousands of tonnes. In plastics machinery, injection cylinders provide mould clamping force. In energy, hydraulic cylinders control turbine gate valves in hydropower and wind turbines. Leading manufacturers include Bosch Rexroth, Parker Hannifin, Eaton, Hydac and Bucher Hydraulics. Imports from China and Turkey are significant in the EU market. Cylinder quality is determined by manufacturing precision, seal quality and rod surface treatment (hard chrome or nitriding).

CN code 8412 21 covers linear hydraulic actuators. These actuators are used in industrial automation, construction machinery and specialist vehicles. Import requires compliance with Machinery Directive 2006/42/EC and ISO standards for hydraulic/pneumatic systems. Customs clearance requires CE certificate and manufacturer's technical documentation.