General Characteristics
VECOBLOC® taper bushes are primarily made from cast iron, unless specified otherwise. All bushes are equipped with keyways, adhering to the AFNOR E 22.175 standard, ensuring that force is applied on the key sides rather than the top. For shaft diameters measured in inches, further consultation is required.

Designation
Each VECOBLOC bush is identified by two numbers, indicating the maximum possible diameter and the length of the bush, respectively (e.g., 50.30 indicates a 50 mm diameter and 30 mm length).

Technical Characteristics
The technical data includes specifications for various bush models, detailing screw dimensions, weight, shaft diameters, key diameters, and torque requirements. For example, the 28.20 model uses screws of 6 x 6 mm, has a shaft diameter range of 18-22 mm, and a torque requirement of 13 Nm. The table provides comprehensive data for each model, including the material specifications for certain diameters where the bush is made of steel instead of cast iron.

Material Specifications
For specific diameters, the bush is made of steel, and the key height may be reduced by 1 mm. This is noted for diameters marked with special symbols in the technical tables.

Conclusion
The document provides detailed specifications for VECOBLOC® taper bushes, including material composition, keyway standards, and technical dimensions. It serves as a comprehensive guide for selecting the appropriate bush model based on specific mechanical requirements.