pysäytysruuvit

Pysäytysruuvit, also known as stop screws or set screws, are a type of screw used to secure an object in place by engaging a mating feature on the object. Unlike traditional screws that are driven through an object into a substrate, pysäytysruuvit are typically threaded into a hole within one object and their tip presses against the surface of another object, preventing relative motion.

These screws are commonly used in mechanical applications to fix a rotating component, such as a pulley or gear, onto a shaft. The pysäytysruuvi is inserted into a threaded hole in the hub of the pulley or gear and its tip is tightened against the shaft. This creates a firm connection that prevents slippage. They are also found in applications where precise positioning is required, acting as adjustable stops or limiters.

Pysäytysruuvit come in various head styles, including hex socket (Allen head), slotted, and Torx. The choice of head style often depends on the accessibility of the screw and the torque required for tightening. The tip of the pysäytysruuvi can also vary; common types include flat point, cone point, cup point, and dog point. Each tip design offers different holding characteristics. For example, a cup point provides a strong grip on a shaft by creating a small indentation, while a flat point is suitable for applications where marring of the mating surface is undesirable. The material of pysäytysruuvit is typically steel, with various finishes like zinc plating or black oxide available for corrosion resistance.