| Sr.No. | Bolt | Screw |
| 1 | Screws are tightened by rotating the tool clockwise and are usually used for joining materials that do not have existing holes in them. | A screw is an externally threaded fastener capable of being inserted into holes in assembled parts, of mating with a preformed internal thread or forming its own thread, and of being tightened or released by torquing the head. |
| 2 | Bolt is always used in pair like nut & Bolt | Screws are always used by itself. |
| 3 | Bolts are used with un-threaded components. | Screw can be used with threaded or un-threaded components. |
| 4 | In the bolt cross Uniform section | In screw can have non- uniform cross section |
| 5 | The threads are spiral in shape. | The threads are helical in shape. |
| 6 | It doesn't have tapered shank. | It has tapered or pointed shank. |
| 7 | This Bolts mostly require wrenches and spanners for the tightening and loosening purposes. | This screw requires mostly screw drivers for the tightening and loosening purposes. |
| 8 | This bolt is reliable | Here, Screw is less reliable |
| 9 | Bolts are larger in size. | Screws are smaller than bolts. |
| 10 | Larger size bolts are used to achieve higher load-carrying capacity. | Screws are not available in very large size. They are generally used for low load carrying applications. |
| 11 | Bolt are always fixed at a single position with the use of a tool. | Screws has to be turned every time it has to be assembled. |
| 12 | They apply compression on the parts that they join. | They don’t apply compression on the parts that they join. |
| 13 | They are often used in the making of bolted joints. | They can't be involved in the bolted joint making due to the presence of at least one thread. |
| 14 | The examples of bolts are Anchor bolt, T-head bolt, Toggle bolt, U-bolt, J-bolt, Eyebolts, Hexagon bolt/Tap bolt, Lag bolt, Machine bolt, Carriage bolt, Elevator bolt, Flange bolt, Hanger bolt, Plow bolt, Shoulder bolt, Square head bolt, Stud bolt, Timber bolt, etc. | The examples of screws are self-drilling, socket screw, eye lag, mating screw, Wood screw, machine screw, thread cutting machine screw, sheet metal screw, set screw, etc |
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