The Caterpillar 3B-4502 Lockwasher (Push Button Internal Tooth Lockwasher) is a spring-steel retaining and locking fastener. It is engineered to press onto specific pin layouts, round shafts, or small-diameter studs—such as circuit breaker push buttons and structural electrical clusters—to maintain constant holding tension and prevent loosening under high mechanical vibration.
1. Core Dimensions & Weight
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Inside Diameter: 4.90 mm (0.193 in)
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Outside Diameter: 8.48 mm (0.334 in)
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Washer Thickness: 1.19 mm (0.047 in)
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Net Weight: 0.001 kg (0.002 lbs)
2. Material & Coating Specs
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Material Grade: Premium high-elasticity tempered spring steel matrix.
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Structural Design: Push button style with inward-facing lock teeth that bite into the shaft surface for irreversible grip.
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Surface Treatment: Electroplated Zinc coating providing 96-hour salt spray resistance (RoHS compliant).
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Performance Advantage: Maintains constant axial pressure and tight contact configurations under continuous cyclical loading.
3. Equipment & System Compatibility
This specialized locking washer is standard hardware applied across a diverse range of electrical panels, operator cabs, and frame groups:
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Articulated Dump Trucks: CAT D250E and D300E powertrain circuit installations.
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Asphalt Pavers & Industrial Infrastructure: Caterpillar AP-650B, AP-800C, AP-900B, AP-1000B, AP-1050, AP-1055B, and BG-225C systems.
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Classic Machine Legacy Groups: Integrated into various instrument panels and mechanical throttle controls ranging from early D2 crawler tractors to modern industrial enclosures.
4. Part Cross-References
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Alternative Part Names: Push Nut, Star Lock Washer, Retaining Clip.
- Alternative Part Numbers: 3B4502, 3B 4502.
