The John Deere 34H421 is a genuine OEM spring pin designed for secure fastening in a wide range of John Deere machinery. This durable pin features a diameter of 4.78 mm and a length of 25.4 mm, ensuring a precise fit and reliable performance. It is commonly used across numerous John Deere agricultural, construction, and utility equipment models, including compact utility tractors, excavators, loaders, and large agricultural tractors, providing essential structural support and connection.