The Caterpillar 2A-4429 Hex Nut is a high-tensile, heavy-duty mechanical locking fastener. It is widely used across various heavy equipment structures, engine brackets, and linkage groups to maintain critical clamping force under intense mechanical vibration and heavy cyclic loads.
1. Core Dimensions & Fastener Specs
- Thread Size: 3/8 inch
- Hole Thread Pitch: 24 threads per inch (3/8-24 UNF Fine Thread)
- Nut Thickness / Height: 8.33 mm (0.328 in)
- Drive / Hex Width Across Flats: 14.29 mm (9/16 in)
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Net Weight: 0.007 kg (0.015 lbs)
2. Material & Manufacturing Specs
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Material Grade: Premium high-strength carbon or alloy steel (SAE J995 Grade 8 equivalent).
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Coating & Finish: Standard zinc plating or dark phosphate coating to provide rust prevention and eliminate thread galling during high-torque assembly.
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Structural Configuration: Standard full-height hexagonal design engineered to handle severe clamping stresses without stripping threads or deformation.
3. Equipment & System Compatibility
This fine-threaded structural nut is standard hardware utilized across a vast variety of Caterpillar engine groups, steering linkages, and fluid line supports:
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Engine Platforms: Integrated into accessory drive mounts, engine wiring harnesses, and bracket groups for CAT 3306, 3406, 3408, 3412, 3508, 3512, and 3516 engine variants.
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Track-Type Dozers & Loaders: Deployed inside chassis panels, engine bay shields, and linkage configurations for Caterpillar D5, D6, D7, and D8 fleets.
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Heavy Infrastructure & Mining Machinery: Found across structural panels, wiring conduits, and auxiliary mounting clusters in heavy motor graders, hydraulic excavators, and off-highway mining haulers.
4. Part Cross-References
- Alternative Part Names: Finished Hex Nut, Fine Thread Nut.
- Alternative Part Numbers: 2A4429, 2A-4429.
