Types Of Keyed Shafts

Shafts are mechanical elements that are essential for the transmission of force or power, used mainly to transmit rotational movement and torque from a point to another point. Other mechanical components, such as gears, sprockets, cams, etc. are all mounted on the shaft where required. One of the most important methods of mounting which connects such mechanical elements is the use of keys.

A keyed shaft requires a key seat on the shaft and the mechanical element too.

A key is used to transmit torque and is shaped based on the type of key it is. It is a small element which is used to transmit torque and rotary motion, in some cases, it tends to behave like a fuse because it destroys itself before the shaft or mechanical element is completely damaged.

We sell various types of keyed shafts, and we have listed and briefly described them below.

Parallel key

Parallel keys are otherwise called the straight keys and they are made of square and rectangular styles. These are the most used keys. As a general rule, the shaft has a slot that runs it full length which is to hold the key or alternatively, a slot that's longer than the key which starts at the end of the shaft. During installation, the key slots on the shaft and component are aligned, and then the parallel key is pressed in.

Saddle keys

The saddle keys are keys that are usually connected to the drive element (for example, shafts). These keys are known to have less strength than for instance, sunk keys. These keys are used to transmit less energy to the driven elements, through the couplings.

Tangent keys

The high torque and heavy duty machines use the Tangent keys. The keyway resembles that of a parallel key, except that it tangentially extends from the outer shaft into the inner shaft. What would have been the side of each keyway is the heel against which the key is located and transmits the compressive force.

Woodruff keys

The Woodruff keys are usually semicircular and are partially fitted into round segment keyways, the remainder is fitted to a longitudinal slot mating part. Without any reliefs, the circular segment may be cut directly with a plunge cutting using a circular woodruff cutter. The primary advantage of the Woodruff key is that there is no need for milling near the edges of the shaft, where there would be a compromise in the concentration of the tension, so no concentricity would be compromised.