Mechanical keys are explained along with their types

1. Department Of Mechatronics & Control Engineering
Muhammad Junaid Zahid 2016-MC-05
Usama Asim 2016-MC-02
Talha Hsan Aslam 2016-MC-21
DEPARTMENTAL PRESENTATION
Topic
“Types Of Mechanical keys and their Drawing
Symbols.
Presented By:
1

2. Mechanical Keys:
A key is define the piece
inserted in a axial
direction between a
shaft and hub to prevent
relative rotation but
allow sliding movement
along the shaft if
required.
2

3.  Saddle Keys
 Round Keys
 Tangent Keys
3
Types Of Mechanical Keys

4. 4
 Splines Keys
 Sunk Keys
Types Of Mechanical Keys

5. Saddle Keys
“Saddle key are taper keys which are sunk into the
hub only. It is suitable for light duty.”
5
They are further divided into two types:
Hollow Saddle keys
Flat saddle keys

6. 6
Hollow Saddle Key
“This key has its underside hollow out so that it can be placed
on the curved surface of the shaft.”

7. 7
Flat Saddle Key
“In this the flat surface is made on the shaft over which
the key is placed in position.”

8. 8
Tangent Keys
“The tangent keys are fitted in pair at right angles.Each
key can be rotated in only one direction.These are used
in Large heavy duty shaft.”

9. 9
Splines
“These keys are made along with the shaft means
they are part of it,fitted in the keyways broached
In the hub, which are known as splines shaft.”

10. 10Round Keys
Round keys are circular in part which fits into
holes drilled partially in shaft with fairly in
hub.They are most suitable for low power
devices”

11. 11
Sunk Keys
“ The sunk keys are provided half in the keyway of the shaft and
half in the keyway of the hub or boss of the pulley or gear.”
They are further classified as:
 Woodruff Sunk Key
 Feather Sunk Key
 Gib-head sunk key
 Rectangular Sunk Key

12. 12
Rectangular Sunk Key
“Rectangular Sunk Key is the one, in which height and width are not
Equal”

13. 13
Gib-head Sunk Key
“It is a rectangular sunk key with a head at one end known as Gib-head. It is a
usually provided to facilitate the removal of key.”

14. 14Woodruff Sunk Key
“It is an adjustable sunk key. in the form of a semi-
circular disc of uniform thickness. The key fits into a
semi-circular keyway in the shaft and the top of the key
fits into a plain rectangular key way in the hub of the
wheel.”

15. 15
Feather Sunk Key
“It is a key attached to one member of a pair and permitting relative
motion axial movement thus it is particular kind of parallel key
which permits axial moment.”

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