The G L Huyett Machine Key M5 x 5 x 40 Form B is crafted from high-quality carbon steel, designed for reliable performance in mechanical applications. Measuring 5 mm in width and 40 mm in length, this undersized key fits securely in keyways, providing effective engagement for rotating components. Its form B classification ensures compatibility with various systems, making it suitable for both light and heavy-duty applications. The key's durable construction and precise dimensions make it an essential component for machinery and equipment.