RAF Electronic Hardware Knurled Thumb Screws; Length Under Head (Seed)=.500 in, Thread Size=#4-40 AJ-509

Screws are threaded fasteners used to join two or more objects or hold an object in position. We offer a diverse line of screws with imperial or metric threads. Our assortment of cap screws includes standard head, button head, flat head, flange head, and more. We also stock a large selection of captive screws, set screws, shoulder screws, thumb screws, and wing screws. . Knurled thumb screws are one of the most important types of screws used in various industrial applications. ... These screws can be tightened or loosened manually.