Material: Steel. Characteristics: - High torques. - No axial shaft-hub movement. - Quick mounting. - Quick demounting. Tolerances, Surface Roughness: Highest permissible surface roughness: Rt=12.5µm. Largest permissible tolerances for the shaft: h8. Tolerances for dw/d: H8 / h8. Axial Displacement: No axial movement between hub and shaft can occur while fastening the screws. Other sizes up to inner diameter 300mm on request.