This Design Squad Nation animation shows how a pop rivet clamps two pieces of material together.
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Ball Bearings since they are commonly used in many applications from cars to bicycles. I chose the single row deep groove (radial) ball bearing, since this tends to be the most common type. This type of bearing has fair radial and thrust load capacities, it's excellent for high speed, accuracy, and for low noise and torque, and has good capacity for angular misalignment.