CATERPILLER 187-7738

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The Caterpillar 187-7738 Flat Hard Washer is a high-tensile, heavy-duty structural distribution fastener. It is engineered to maintain extreme clamping force, provide a stable load-bearing surface, and prevent joint relaxation or deformation across high-stress engine block assemblies, cylinder heads, and chassis structures subject to relentless machine vibrations and cyclic loading.

Core Dimensions & Fastener Specs
Fits Bolt Size: 3/4 inch (M20 equivalent)
Inner Diameter (ID): 21.00 mm (0.827 in)
Outer Diameter (OD): 36.50 mm (1.437 in)
Washer Thickness: 3.50 mm (0.138 in)
Washer Type: Hardened Flat Washer
Material & Manufacturing Specs
Material Grade: Premium high-strength hardened structural steel.
Coating & Finish: Industrial zinc phosphate and oil coating providing up to 72 hours of red rust salt spray resistance, engineered to eliminate friction spikes and prevent surface corrosion prior to assembly.
Color / Appearance: Dark grey to black.
Design Optimization: Hardened profile eliminates washer dishing or structural deformation when subjected to heavy-duty torque ratings during installation.
Equipment & System Compatibility
This high-fatigue hardened structural washer is standard heavy-duty hardware deployed across a vast selection of large-scale Caterpillar heavy machinery, marine propulsion systems, and high-horsepower engine platforms:
Engine Platforms: Commonly paired with heavy-duty 12-point head cylinder head bolts (such as 7N-1961) inside critical fastener groups and cylinder head assemblies for high-displacement CAT engine divisions.
Heavy Machinery: Heavily utilized within high-load chassis panels, suspension mounting brackets, structural linkages, and critical powertrain system enclosures across Caterpillar equipment fleets.
Part Cross-References
Alternative Part Names: Hard Washer, Hardened Flat Washer, Structural Washer.
Alternative Part Numbers: 1877738, 187-7738.