The Machine Key 5/16 x 5/16 x 1-5/8 Form B 1045 Undersize from G L Huyett is engineered for precise alignment in mechanical assemblies. Crafted from high-quality 1045 carbon steel, this key provides superior strength and durability. Its dimensions of 5/16" x 5/16" x 1-5/8" make it suitable for various applications, including gear and pulley systems. The undersized design allows for easy installation and adjustment, ensuring a secure fit. This machine key complies with industry standards, making it a reliable choice for engineers and technicians.