The Machine Key 5/8 x 5/8 x 2-3/16 is an undersized key made from durable carbon steel, designed for secure fastening in various mechanical applications. With dimensions of 5/8 inch in thickness and width, and a length of 2-3/16 inches, this key is ideal for use in machinery requiring precise alignment and torque transfer. Its robust construction ensures longevity and resistance to wear, making it suitable for high-stress environments. This key complies with industry standards, ensuring it meets the necessary specifications for reliable performance.