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Description
1187 – Rotary Cupped Serrated Washer 3/8"
The Rotary 1187 is a heavy-duty cupped serrated washer designed to provide secure fastening and vibration resistance in outdoor power equipment applications. The cupped (Belleville-style) design maintains tension under load, while the serrated surface helps prevent loosening caused by vibration.
Manufactured from durable, corrosion-resistant steel, this washer is ideal for use in mower decks, engine mounting, and general equipment fastening where reliable clamping force is required.
Product Details
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Part Number: 1187
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Brand: Rotary
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Part Type: Cupped Serrated Washer
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Size: 3/8 inch
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Style: Cupped / Serrated
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Material: Hardened, corrosion-resistant steel
Function
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Provides constant tension under vibration
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Serrations help prevent fastener loosening
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Distributes load evenly
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Enhances fastener holding strength
Compatibility
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Fits 3/8" bolts or studs
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Used in a wide range of outdoor power equipment applications
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Always verify fastener size before installation
How It’s Used
This washer installs beneath the bolt head or nut, with the cupped side providing spring tension and the serrated surface gripping the mating surface to resist loosening.
Proper orientation ensures maximum holding power.
Suggested Maintenance
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Inspect washer during fastener service
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Replace if flattened, cracked, or corroded
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Do not reuse washers that have lost spring tension
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Use OEM-spec hardware for best results
The Rotary 1187 Cupped Serrated Washer 3/8" is ideal for maintaining secure fastener connections in high-vibration outdoor power equipment applications.
