The Difference Between A Machine Screw And A Hex Bolt

Machine screws: Typically have a uniform diameter along their entire length. Feature diverse head styles, including Phillips, slotted, round, or pan heads. Threads often extend nearly to the head, designed to mate with pre-tapped holes or nuts.

Hex bolts: Have a hexagonal (six-sided) head, enabling greater torque application via a wrench or socket. Usually include a shank (unthreaded portion) between the head and threaded part (though some are fully threaded). Threads are coarser compared to many machine screws, especially those for lighter applications.

Machine screws: Generally smaller, with diameters ranging from #0 (0.060 inches) to ½ inch. Shorter in length, suitable for securing thinner materials or components.

Hex bolts: Larger, with diameters typically starting from ¼ inch and going much larger. Available in longer lengths, enabling them to handle heavier loads and provide stronger connections.

Machine screws: Commonly used in electronics, precision machinery, appliances, and light to medium-duty assemblies. Ideal for securing parts where one or both components have pre-threaded holes, requiring a secure but relatively low-torque connection.

Hex bolts: Ideal for heavy-duty applications such as construction, automotive manufacturing, industrial machinery, and structural projects. Designed to withstand high stress, frequently used with nuts and washers to clamp large or thick materials.

Machine screws: Driven using screwdrivers matching their head style. May not require additional hardware beyond a nut in some cases.

Hex bolts: Require wrenches or sockets for installation due to their hexagonal heads. Allow higher torque application, necessary for creating tight, secure joints in heavy-duty scenarios.