4W-5698-040 Caterpillar Main Bearing (.040″ Undersize) | Compatible with 3406/B, 3408/B, 3412/B Engines

The Caterpillar Main Bearing (Part Number 4W-5698-040) is engineered for use in Caterpillar 3406, 3408, and 3412 series engines, including the B variants. This bearing features a .040″ (1.00mm) undersize specification, making it ideal for crankshafts that have been machined to this dimension. Constructed from high-quality, heat-resistant materials, it ensures optimal performance and durability under demanding conditions. Designed to meet or exceed OEM standards, this bearing provides reliable support for the crankshaft, reducing friction and wear to enhance engine longevity.