1A5666 Nut Fits Caterpillar Models

One New Aftermarket Replacement Plain Hex Nut for Caterpillar (Cat) Equipment

This aftermarket replacement plain hexagon nut (Cat part number 1A5666) is a fine-thread fastener used across a wide range of Caterpillar (Cat) construction, industrial, and engine applications. Also referenced as a cylinder block nut in some catalogs, this hardware nut sees use throughout many Cat machine assemblies. Interchange number 1B4208.

Specifications

• Type: Plain Hexagon Nut
• Thread: Fine Thread
• Dimensions: approximately 1.18 x 1.18 x 0.79 in.
• Weight: approximately 0.2 lbs.

Compatible Models

Caterpillar Articulated Trucks: D250E, D300D, D40D

Caterpillar Backhoe: D4

Caterpillar Excavator: 215B

Caterpillar Gas Engines: G342C, G3516

Caterpillar Generator Set Engines: 3508, 3508B, 3512, 3512B, 3516, 3516B

Caterpillar Industrial Engines: D342, D342C, D346, D348

Caterpillar Marine Engines: D342, D342C, D343, D346, D348, D349

Caterpillar Pipelayers: 572G, 583K

Caterpillar Rippers: 951, 977

Caterpillar Track Loaders: 955H, 983

Caterpillar Track-Type Tractors: D10, D4D, D4E, D4E SR, D5, D8H, D8K

Caterpillar Tractors: 772, 776C, 776D

Caterpillar Trucks: 777, 777B, 777D, 777F

Caterpillar Truck Engines: 1693

Caterpillar Underground Articulated Trucks: AD40, AE40

Caterpillar Vehicular Engines: D346, D348, D349

Caterpillar Vibratory Compactors: CP-433C

Caterpillar Wheel Loaders: 992

Caterpillar Wheel Scrapers: 615, 623E, 657B

Caterpillar Wheel Tractors: 621, 623E, 631C, 641B, 650B, 651E, 657E

Replaces Part Number(s):

1A5666, 1A-5666

Aftermarket Interchange Numbers

1B4208

New aftermarket replacement part - not remanufactured, not used.