What is the difference between a saddle key and a sunk key

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Least Cost Method - operation research. Velox boiler - high pressure boliers. Properties of Hydraulic oil - oil hydraulic and pneumatic. Tangent keys are actually a pair. These pair of keys are placed right angles to each other and tangent to the surface of the shaft as shown in the fig. Round keys are circular in section and fit into the holes. The round keys will be placed half portion hole in the shaft and the other half portion hole in the hub as shown in the fig.

These type of shaft keys are usually prepared for the low power drives. All the above-mentioned keys are individual parts. That what we called as the Splined shafts. These are used in the special applications like where we have to transmit the torque larger in portion than the shaft size. These are the different types of shaft keys available for connecting the machine elements. Let us know your thoughts in the comments section below. Your email address will not be published.

Sign me up for Post Updates! This site uses Akismet to reduce spam. Learn how your comment data is processed. Our motive is to help students and working professionals with basic and advanced Engineering topics. Square key and flat key :. Sunk keys are used in two ways :.

Square Rectangular cross-section A sunk key with rectangular cross-section is called a flat key. The flat key is more stability as compared with the square key. Square keys are used in general industrial machinery while flat keys are more suitable for machine tool applications. Taper key and Parallel key :. A parallel key which is uniform in width as well as height throughout the length of the key. A tapper key is also uniform in width but tapper in height. Standard tapper is 1 in Tapper is provided due to the following reason :.

Due to tapper, it is easy to remove the key and dismantle the joint easily. Tapper insures tightness of joint in operating conditions and prevent loosening of the parts. Glib-head key :. Glib keys are tapered and notched machine keys that are used on power transmission keyed shafts to hold pulleys and gears tightly on the shaft. Taper keys are often provided with glib-head to facilitate removal.

Glib head key has following advantages as compare with parallel key, taper key :. The taper surface results in wedge action and increases frictional force and the tightness of the joint. The taper surface facilitates easy removal of the key, particularly with glib-head keys. Feather key :. A feather key is a parallel key which is fixed either to the shaft or to the hub and which permits relative axial movement between them.

The feather key is a particular type of sunk key with uniform width and height. Feather key used where the parts mounted on the shaft are required to slide along the shaft such as clutches or gear shifting devices. Feather key is an alternative to splined connection. Woodruff key :.