This undersized Machine Key measures M4 x 4 x 15 mm and is constructed from high-quality carbon steel, ensuring strength and durability. Designed in Form A, this key is perfect for securing components in rotating machinery, providing a reliable connection that prevents slippage. Its precise dimensions allow for compatibility with various shaft and hub configurations, making it a versatile choice for mechanical applications. This key meets industry standards for quality and performance, making it suitable for both industrial and commercial use.