The Unbrako alloy steel socket cap screw has a black oxide finish, knurled socket cap head, and hex socket drive, and meets American Society of Mechanical Engineers ASME B18.3.1M specifications. Alloy steel is often used in applications where strength is the primary consideration, and the black oxide finish offers mild corrosion resistance and lubricity. The knurled socket cap head is round with a flat top and a high profile that provides high strength, and installs using an internal drive system that enables more compact spacing than a hex head cap screw. Knurling on the head enhances grip for hand-turning. The hex socket drive, also known as an internal hex drive, has a hexagonal slot that requires an Allen key driver, also known as a hex key or Allen wrench.Socket cap screws are threaded fasteners that have a cap head with an internal socket drive for installing in areas with limited side clearance. These screws are available with a variety of head shapes, which determine how the screw interacts with the mating surface, and drive styles, which determine the type of tool required to install the screw.Unbrako manufactures high-strength socket screws and other fasteners, including dowel pins and shoulder screws. The company, founded more than 80 years ago, meets International Organization for Standardization (ISO) standards 9001:2000 and TS 16949:2002.
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