Spärrskruvar

Spärrskruvar, also known as set screws or grub screws, are headless screws typically used to secure one object to another through a threaded hole. Unlike standard screws which are often used to fasten two surfaces together with a visible head, spärrskruvar are inserted fully into a threaded hole in one component and then tightened against the surface of another component. This creates a strong locking action.

The primary function of a spärrskruv is to prevent relative movement between two parts. This is achieved by the tip of the screw digging into or pressing firmly against the mating surface. Common applications include securing pulleys to shafts, locking collars, and in many mechanical assemblies where a precise alignment or a strong hold is required without a protruding fastener head.

Spärrskruvar come in various thread types and head styles, though they are typically headless. The most common drive types include hex sockets (Allen heads) and slotted heads. The tip of the spärrskruv can also vary; common types include the flat point, cup point, cone point, and dog point, each designed for specific gripping characteristics against the mating surface. The choice of spärrskruv depends on the materials involved, the required holding force, and the operating environment.