A knuckle joint is a form of pin joint that is used to connect two tension-loaded components. Otherside, A cotter joint, also known as a socket and spigot joint, is a way of connecting two coaxial rods temporarily.
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Difference between Knuckle joint and Cotter joint:
In the table below, you’ll find some essential distinctions between these joints:
| S.No | Knuckle joint | Cotter Joint |
| 01. | The knuckle joint connects two rods whose axes either coincide or intersect and lie in the same plane and are subjected to axial tensile force transmission. | The cotter joint connects two co-axial rods that are subjected to axial force. |
| 02. | When angular displacement is required, a knuckle joint is employed. | When there is no angular displacement between two rods, a cotter joint is utilized. |
| 03. | The knuckle joint is designed to handle high-tensile loads. | For minor tensile and compressive forces, cotter joints are utilized. |
| 04. | Allow for angular movement between the rods. | Allowing angular movement between rods is not permitted. |
| 05. | Even when two shafts are in motion, a Knuckle joint is designed to enable certain mobility or angle between them. | The cotter joint is designed to help aligned shafts rotate in the same direction. |
| 06. | There is no taper or clearance offered. | Clearance and taper are included. |
| 07. | Bearing failure is a common incident. | Bearing failure is not a problem |
| 08. | Part of the Knuckle Joints are the fork end, Rod end, Split pin | Part of the Cotter Joints are the cotter, spigot, socket |
| 09. | A circular pin is used in the knuckle joint | A rectangular pin is used in the cotter joint. |
| 10. | Used in tie bars, bicycle chain links, and all shifting mechanisms’ joints. | Used to unite two rods with a pipe, and to join the piston rod to the crankshaft head in cotter foundation bolts. |
Related Article- Cotter Joint: Definition, Types, Applications, Advantages, Disadvantages
Related Article- Knuckle Joint | Definition | Construction | Design | Applications and More
Related Also- Universal Joint: All you need to Know
Final Thoughts-
These were some of the distinctions I made in the Difference between Knuckle joint and Cotter joint above.
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Abhishek Tiwary is a blogger by passion and a Quality Engineer by profession. He completed his B.Tech degree in the year 2017. Now working in a reputed firm. He loves to share his knowledge with others.
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