13990077 – Wright Belleville Washer, M8 × 0.70 OD (Genuine Wright OEM Part) The Wright 13990077 is a genuine OEM Belleville (conical spring) washer, engineered to provide controlled preload, vibration resistance, and consistent clamping force in compatible Wright lawn and turf equipment. Belleville washers are commonly used in high-vibration or load-cycling applications where maintaining fastener tension is critical. Manufactured to Wright original equipment specifications, this washer is produced from high-strength spring steel and formed to retain its conical shape under load, allowing it to compensate for thermal expansion, component settling, and vibration. Using a genuine Wright Belleville washer ensures correct spring characteristics, proper fitment, and factory-approved fastening reliability. Product Details Manufacturer Part Number: 13990077 Brand: Wright Part Type: Belleville Washer (Conical Spring Washer) Fastener Size: M8 Outer Diameter: 0.70 inch System: Fastening / hardware system Function: Provides spring preload and resists loosening Material: High-strength spring steel OEM Status: Genuine Wright OEM replacement Function Maintains consistent clamping force under vibration Compensates for thermal expansion and material compression Helps prevent fastener loosening Provides controlled spring action in critical assemblies Compatible With The Wright 13990077 Belleville Washer is used on select Wright equipment, including: Wright stand-on mowers Wright commercial lawn and turf equipment Wright assemblies requiring M8 Belleville (conical) washers (Exact compatibility depends on the specific Wright model and fastening location.) How It’s Used This Belleville washer installs between the fastener head or nut and the mating surface, with the conical profile oriented according to Wright assembly specifications. When tightened, it compresses to apply spring force that maintains preload during operation. Proper orientation and torque are essential for correct performance. Suggested Maintenance Inspect Belleville washers during service for flattening or cracks Replace washers that have lost their conical shape Do not reuse washers showing fatigue or deformation Use only OEM-specified Belleville washers to maintain correct preload The Wright 13990077 Belleville Washer (M8 × 0.70 OD) is used in OEM-specified Wright fastening systems where vibration resistance, preload control, and long-term fastening reliability are essential.
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