ruuvimeisselit

Ruuvimeisselit, often anglicized as screwdrivers, are hand tools used to insert and remove screws. The fundamental principle of a ruuvimeisseli involves a handle and a shaft ending in a tip designed to fit into a corresponding slot or recess on the head of a screw. The torque applied to the handle is transmitted through the shaft to the tip, allowing the user to turn the screw.

The most common types of ruuvimeisselit are distinguished by the shape of their tips. The slotted ruuvimeisseli, also known as a flathead or straight-edge, features a single, flat blade. This was the earliest form and is still used for some older screws. The Phillips ruuvimeisseli, characterized by its cross-shaped tip, was designed to cam out under excessive torque, preventing overtightening. Pozidriv is a variation of the Phillips, offering better grip and reduced cam-out. The Torx ruuvimeisseli has a star-shaped tip with six rounded lobes, providing excellent torque transfer and resistance to stripping. Hex or Allen ruuvimeisselit have hexagonal tips, commonly used in furniture assembly and machinery.

Ruuvimeisselit vary in size, from small precision tools for electronics to large, heavy-duty versions for construction. The choice of ruuvimeisseli depends on the type and size of the screw, as well as the required torque. They are indispensable tools in a wide range of applications, from everyday household repairs to complex industrial manufacturing.