13990002 – Wright Flat Washer, USS 7/16 (Genuine Wright OEM Part) The Wright 13990002 is a genuine OEM flat washer, manufactured to USS (United States Standard) 7/16-inch specifications, and designed for secure fastening applications on compatible Wright lawn and turf equipment. This washer evenly distributes clamping force under a bolt head or nut, helping prevent surface damage, fastener loosening, and uneven load distribution during equipment operation. Manufactured to Wright original equipment standards, the washer features a zinc-plated (Z) finish that provides added corrosion resistance for outdoor and commercial mowing environments. Using a genuine Wright flat washer ensures proper dimensions, reliable fitment, and factory-approved fastening performance. Product Details Manufacturer Part Number: 13990002 Brand: Wright Part Type: Flat Washer Size: 7/16 inch Standard: USS (United States Standard) Finish: Zinc-Plated (Z) System: Fastening / hardware system Function: Distributes load and protects mating surfaces Material: Steel, zinc-plated OEM Status: Genuine Wright OEM replacement Function Distributes clamping force evenly Protects components from surface damage Helps prevent fastener loosening due to vibration Compatible With The Wright 13990002 Flat Washer is used on select Wright equipment, including: Wright stand-on mowers Wright commercial lawn and turf equipment Wright assemblies requiring USS 7/16-inch flat washers (Exact compatibility depends on the specific Wright model and fastening location.) How It’s Used This flat washer installs between the fastener head or nut and the mating surface. When tightened, it spreads the load over a larger area to improve fastening stability and protect components. Ensure the washer is seated flat and paired with the correct fastener size. Suggested Maintenance Inspect washers during service for deformation or corrosion Replace washers if bent, cracked, or excessively worn Ensure proper washer size is used for the fastener Keep hardware clean to maintain proper clamping force The Wright 13990002 USS 7/16 Flat Washer is used in OEM-specified Wright fastening systems where durability, correct fitment, and secure fastening are essential.
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