Second edition of Machine Design Data Book is being presented to the readers after making a through revision as per the needs of the various Universities and Institutions. There has been a great demand from the students and teachers to have a Data Book which should be authentic with proper references. We have tried to give all the relevant information in this regard. The book contains 14 chapters on Flat and V-Belts, Chains, Ropes, Spur Gears, Helical Gears, Bevel Gears, Worm Gears, Sliding Bearings, Rolling Contact, Bearings, Internal Combustion Engine Parts, Shafts, Keys and Couplings, Coiled and Leaf Springs Clutches and Brakes and Flywheel.* Flat and V-belts * Chains * Ropes * Spur Gears * Helical Gears * Bevel Gear * Worm Gear * Sliding Bearings * Rolling Contact Bearings * Internal Combustion Engine Parts * Shafts, Keys and Couplings * Coiled and Leaf Springs * Clutches and Brakes * Flywheel