4K8977 Nylon Locknut for Caterpillar Equipment

4K8977 is a nylon locknut used as a fastening component on Caterpillar excavators, engines, snow blowers, track loaders, track-type tractors, truck engines, wheel loaders, and wheel tractors. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The listed applications cover several Caterpillar equipment families and model series. Fitment should be verified against the machine model and the part number before installation, particularly where the same equipment family includes multiple configurations.

Fitment

• Excavators: Caterpillar 215, 225, 235, 245
• Industrial engines: Caterpillar D342C, D353C
• Marine engines: Caterpillar D342, D353C
• Snow blowers: Caterpillar SR118, SR321
• Track loaders: Caterpillar 931B, 941, 951B
• Track-type tractors: Caterpillar D3B, D4D, D4E, D5B, D7G, D8H, D8K, D8R, D9G, D9H
• Truck engines: Caterpillar 1676, 1693, 3408
• Wheel loaders: Caterpillar 920, 930, 930R, 950, 966C, 966R
• Wheel tractors: Caterpillar 613B, 631D, 633D, 637D

Specifications

The component is identified as a nylon locknut and is listed for use in fastening applications on the Caterpillar equipment models specified above. The supplied dimensional data is 2.5 cm in length, 2.5 cm in width, and 0.8 cm in depth, with a listed weight of 0.1 lb.

Application groups include construction machinery, industrial and marine power units, snow-removal equipment, truck engines, and agricultural or material-handling machines. The model designations are retained by equipment family so that the listed Caterpillar applications can be checked against the machine documentation and the existing fastener.

For parts identification, the reference associated with this item is 4K8977. No additional replacement or supplier reference numbers are provided in the available product data.