As the title implies adjusting screws, also known as back-up screws, stop screws and preset screws, are not just a simple set screw. They are a screw with a purpose--three actually., Precision adjustment screws are used to provide micro positioning on precision instruments such as tables, optical mounts, microscopes, analytical instruments, and flow metering devices., Adjusting screws are mechanical fasteners used to provide precise adjustments to various components in machinery and construction. They allow for fine-tuning of positioning, tension, or alignment in an assembly. Typically made from durable materials, adjusting screws come in various sizes and thread types to meet specific application needs., Adjustment Screws Thorlabs offers fine hex adjusters and ultra-fine hex adjusters in a variety of sizes and pitches to meet the needs of various applications. Also offered are adjustment knobs, lock nuts, and matched adjuster/bushing pairs. Bushing and barrel adapters enable adjuster screws to be used in custom applications and linear translation stages., An adjustment screw is a screw which is used to make very small and precise adjustments. A variety of objects from embroidery hoops to heavy machinery are fitted with adjustment screws which are designed to be used to ensure that something works at an optimum level. Because adjustment screws represent a potential point of weakness as a moving part, they may be specially reinforced to stabilize , A fine adjustment screw is a type of screw that’s designed with 40 to 100 threads per inch. Of course, this is significantly more threads than traditional screws..