Springs (Mechanism) Brakes 4 Clutches (Machinery) 4 Gearing 3 Screws 3 Bearings (Machinery) 2 Belts and belting 2 mer ... Cams 2 Chains 2 Couplings 2 Engineering design 2 Feedback control systems 2 Flywheels 2 Hydraulic machinery 2 Joints (Engineering) 2 Machine design 2 Materials 2 Materials handling 2 Mechanical engineering 2 Nonmetallic materials 2 Pneumatic machinery 2 Shafting 2 Steam-boilers 2 Vibration 2 Actuators 1 Air conditioning 1 Air-compressors 1 Automatic control 1 Clamps (Engineering) 1 Combined cycle power plants 1 mindre ...