3F4550 Lock-Nut for Caterpillar Equipment

The 3F4550 lock-nut is a hardware component used in Caterpillar engine-generator set and industrial engine equipment. It is intended for installation on the Caterpillar D379, D379B, D398, D398B, D399, G379, G379A, G398, and G399 engine models. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The part is identified as a lock-nut and is listed under the Caterpillar equipment part number 3F4550. The current fitment information applies to the Caterpillar engine and generator-set applications specified below.

Fitment

• Caterpillar D379 engine
• Caterpillar D379B engine
• Caterpillar D398 engine
• Caterpillar D398B engine
• Caterpillar D399 engine
• Caterpillar G379 engine
• Caterpillar G379A engine
• Caterpillar G398 engine
• Caterpillar G399 engine

The listed models belong to Caterpillar engine-generator set and industrial engine equipment. Fitment should be confirmed against the machine or engine identification before installation where model configurations vary.

Cross-reference numbers

Numbers 3F4550 and 3F-4550 refer to the same lock-nut identification used for the listed Caterpillar applications. The two formats differ only in the presentation of the part number.

Specifications

The dimensions and weight above are the recorded product measurements for the 3F4550 lock-nut. Thread specification, material grade, installation position, tightening torque, and additional kit contents are not specified in the available product data.