0T0857 Hex Head Bolt for Caterpillar Equipment

0T0857 is a hex head bolt for Caterpillar equipment used in cold planers, earthmoving compactors, and Caterpillar engine-machine applications. The part is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The supplied specification identifies this component as a steel fastener with a standard fine thread and a phosphate coating impregnated with oil. The application data covers selected Caterpillar machine and engine models listed below.

Fitment

• Caterpillar PR-450C cold planer
• Caterpillar 826C earthmoving compactor
• Caterpillar 836G earthmoving compactor
• Caterpillar 3306 engine-machine application
• Caterpillar 3406 engine-machine application
• Caterpillar 3406B engine-machine application
• Caterpillar 3406C engine-machine application
• Caterpillar 3408 engine-machine application
• Caterpillar 3408C engine-machine application
• Caterpillar 3408E engine-machine application

Fitment should be checked against the machine serial number and the dimensions of the fastener being removed, particularly where several configurations of the same Caterpillar model are in service.

Cross-reference numbers

0T0857 and 0T-0857 are the two part-number formats provided for this fastener.

Specifications

The bolt has a hexagonal head for installation with a suitable wrench or socket. Its listed material classification is SAE J429 Class 8, also identified in the supplied data as ISO Class 10.9. The phosphate-and-oil surface treatment is specified as the finish for the fastener.

The listed thread designation is 5/8-18, indicating a 5/8-inch nominal thread diameter and 18 threads per inch. The stated bolt length is 4 1/2 inches, while the head height is listed separately as 0.48 inch. Weight is specified as approximately 0.5 lb per part.