Key and Types of Key in Hindi || Sunk key and saddle key 

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Shaft Keys - Types and Their Design
Tapered Keys: The tapered keys have a rectangular varying cross section. ...
Gib Head Keys: This type of key is quite similar to the tapered key except for a head which is provided at the bigger end of the key in order to facilitate easy removal of the key.
In mechanical engineering, a key is a machine element used to connect a rotating machine element to a shaft. The key prevents relative rotation between the two parts and may enable torque transmission. For a key to function, the shaft and rotating machine element must have a keyway and a keyseat, which is a slot and pocket in which the key fits. The whole system is called a keyed joint.[1][2] A keyed joint may allow relative axial movement between the parts.
Commonly keyed components include gears, pulleys, couplings, and washer
Types
There are five main types of keys: sunk, saddle, tangent, round, and spline.
Sunk key
Types of sunk keys: rectangular, square, parallel sunk, gib-head, feather, and Woodruff.
Parallel keys
Parallel keys are the most widely used. They have a square or rectangular cross-section. Square keys are used for smaller shafts and rectangular faced keys are used for shaft diameters over 6.5 in (170 mm) or when the wall thickness of the mating hub is an issue. Set screws often accompany parallel keys to lock the mating parts into place.[1] The keyway is a longitudinal slot in both the shaft and mating part.
sunk key
shaft key types
shaft key design
shaft key material
saddle key
design of keys pdf
keyway
woodruff key