Disc diameter and drum size directly influence torque capacity because torque equals friction force multiplied by effective radius. A larger disc or drum generally allows higher torque with the same clamping force. However, sizing is not just about diameter. You must also consider pad/shoe area, friction material, actuator force, heat dissipation, and allowable wear limits.
Start with required torque and duty cycle, then choose a brake model series designed for your shaft speed and environment. Confirm compatibility with your disc thickness or brake wheel dimensions, mounting space, and alignment tolerances. For retrofits, measure existing disc/drum dimensions, mounting bolt patterns, and available axial space.
Also consider thermal performance: larger discs often dissipate heat better, improving fade resistance. But too large can introduce inertia or packaging issues. Finally, verify standardization and spare parts availability—using common disc sizes across equipment simplifies maintenance. For critical systems, consult the manufacturer with application details rather than relying on diameter alone.
