The 55 mm steel shaft sleeve is designed for use with bearings 6011, 6211, and 6311, featuring a 50 mm sleeve length and available in undersized options of 2, 3, or 4 mm for precise fitment. This durable sleeve supports reliable shaft alignment and reduces wear in demanding electrical and mechanical systems. Ideal for industrial motors and high-speed equipment, it ensures smooth operation and extended bearing life. The compact design and robust steel construction make it suitable for applications requiring accurate dimensions and dependable performance in confined spaces.