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Bolts and screws are mechanical fasteners used to position and hold two or more components together. Most engineers assume both bolt and screw are same fastener type. But it’s not true. Most bolts can works as screws if used in threaded components. There is no defined difference between bolt and screw. But they have unique application and characteristics. In this article we will discuss the difference between bolt and screw (Bolt vs Screw). Read this article to know various types of screw.
What is Bolt
Bolt is a type of externally threaded fastener, used to position and hold two or more components together. Bolts do not hold in the material, They are generally used along with washers and nuts for high duty applications. During installation, torque in applied to nut to position and hold components together. Examples: Hex Bolt, Anchor Bolt, Eye Bolt etc.
What is Screw
Screw is a type of externally threaded fastener, used to position and hold two or more components at one place. Screws are installed in a pre-drilled tapped hole or they create threads during installation. They do not require nuts and used for relatively low clamping force requirements. During installation, torque is applied to screw itself. Examples: Wooden Screw, Self tapping plastic screws, machine screw etc. Read this article for more details on screws.
Bolt vs Screw
|Application||Nuts are required to secure a bolt.||Screws works on its own.|
|Torque is applied to nut.||Torque is applied to screw|
|Bolts are used with un-threaded components.||Screw can be used with threaded or un-threaded components.|
|Construction||Uniform cross section.||Can have non-uniform cross section.|
|Uniform Shank||Non Uniform Shank|
|Clamping Force||Bolts along with nuts provide high clamping force.||Used for low clamping force requirements.|
|Load Carrying Capacity||Larger size bolts are used to achieve higher load carrying capacity. For example bolts are used in construction industry.||Screws are not available in very large size. They are generally used for low load carrying applications.|
|Examples||Anchor bolt, Carriage bolt, Elevator bolt, Flange bolt, Hanger bolt, Hexagon bolt/Tap bolt, Lag bolt, Machine bolt etc.||Self tapping screws, wooden screws, sheet metal|
screws, Machine screws, Security head screw, unidirection screws etc.
To sum up, It is very difficult to differentiate between bolt and screw. Most bolts can be used as screws if used with threaded components. Read this article to know various type of washers and their application.
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