1K4378 Hex Head Bolts, Phosphate and Oil Coated

1K4378 is a hex head bolt used in Caterpillar equipment. It is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The part is listed for use in articulated trucks, feller bunchers, load-haul-dump machines, track-type tractors, wheel loaders and wheel scrapers manufactured by Caterpillar. The available application data identifies the equipment by machine type and model series.

Fitment

• Articulated trucks: Caterpillar D35C, D35HP, D40D, D44B and D550B.
• Feller bunchers: Caterpillar FB518.
• Load-haul-dump machines: Caterpillar R1300, R1300G and R1300G II.
• Track-type tractors: Caterpillar D10 and D9H.
• Wheel loaders: Caterpillar 988B and 992C.
• Wheel scrapers: Caterpillar 633E.

The listed fitment covers the Caterpillar models specified above. Equipment model identification should be compared with the machine documentation and the part number on the removed component before installation, particularly where several machine configurations or production versions are available.

Within the listed application range, 1K4378 is identified as a head bolt for the corresponding Caterpillar equipment. The source data does not specify the exact installation location, quantity required per machine, tightening torque, or whether nuts and washers are supplied with the bolt.

Specifications

The available specification data provides the overall listed weight and dimensions but does not define whether these measurements refer to an individual bolt, a packaged quantity, or a supplied set. Thread diameter, thread pitch, shank length, head dimensions, material grade, coating thickness, required nut or washer, and package quantity are not specified.

No additional manufacturer or supplier cross-reference numbers are provided for 1K4378. The confirmed identification in the available data is the Caterpillar equipment part number 1K4378.