Description
11990003 – Wright Hex Bolt 5/16″-18 x 4-1/2″ Grade 5 Zinc (Genuine Wright OEM Fastener)
The Wright 11990003 Hex Bolt is a genuine OEM Grade 5 zinc-plated hex head bolt designed to securely fasten critical components on compatible Wright commercial stand-on and zero-turn mowers. Manufactured to Wright’s exact specifications, this 5/16″-18 x 4-1/2″ bolt provides exceptional strength, corrosion resistance, and reliable fastening performance in demanding commercial mowing environments.
Constructed from high-strength Grade 5 steel with a durable zinc-plated finish, the 11990003 Hex Bolt is engineered to withstand continuous vibration, heavy loads, and exposure to moisture and outdoor conditions. Using a genuine Wright OEM fastener helps maintain proper equipment assembly and long-term reliability.
Product Details
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Part Number: 11990003
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Brand: Wright
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Part Type: Hex Head Bolt
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Bolt Size: 5/16″-18 UNC x 4-1/2″
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Grade: Grade 5
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Head Style: Hex Head
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Material: Heat-Treated Steel
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Finish: Zinc Plated
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Installation: Direct OEM Replacement
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OEM Status: Genuine Wright OEM Part
Key Features
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Genuine Wright OEM hex bolt
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5/16″-18 UNC thread
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4-1/2-inch overall length
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Grade 5 high-strength steel construction
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Zinc-plated for corrosion resistance
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Designed for high-vibration commercial equipment
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Precision-machined threads for secure fastening
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Direct replacement with no modifications required
Function
The 11990003 Hex Bolt securely fastens mechanical and structural components while maintaining proper clamping force during mower operation. Its Grade 5 construction provides excellent strength for demanding commercial applications.
Compatible Equipment
The Wright 11990003 Hex Bolt is used on various Wright commercial mowers, including selected:
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Wright Stander®
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Wright Stander X®
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Wright Stander ZK®
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Wright Sentar®
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Wright ZXT®
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Additional Wright equipment utilizing OEM part number 11990003
Always verify your equipment model, serial number, illustrated parts diagram, bolt dimensions, and original OEM part number before ordering to ensure proper compatibility.
Who Is This For?
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Commercial landscapers
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Lawn care professionals
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Equipment repair technicians
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Fleet maintenance departments
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Wright mower owners
Recommended Applications
Ideal for:
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Chassis assembly
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Engine mounting
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Deck mounting
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Suspension components
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General equipment repairs
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OEM hardware replacement
Pros
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Genuine Wright OEM quality
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Grade 5 high-strength steel
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Zinc-plated for corrosion resistance
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Precision-machined threads
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Excellent vibration resistance
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Factory-correct fit
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Long service life
Cons
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Compatible only with applications requiring a 5/16″-18 x 4-1/2″ Grade 5 bolt
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Always tighten to the manufacturer’s recommended torque specification
Comparison – Wright 11990003 OEM Bolt vs Generic Hardware Bolts
Wright 11990003 Genuine OEM Bolt
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Exact OEM dimensions and thread tolerances
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Grade 5 heat-treated steel
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Durable zinc-plated finish
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Superior strength and reliability
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Designed specifically for Wright commercial equipment
Generic Replacement Bolts
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May vary in material grade and thread accuracy
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Variable corrosion resistance
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Potential fitment inconsistencies
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Reduced durability under heavy commercial use
Why Buy from Barry’s Power Equipment?
Barry’s Power Equipment supplies genuine Wright OEM replacement parts trusted by commercial landscapers and outdoor power equipment professionals.
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Genuine OEM Wright replacement parts
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Fast nationwide shipping
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Competitive pricing
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Expert technical support
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Extensive inventory for Wright, SCAG, Toro, Exmark, Ariens, Gravely, Ferris, Hydro-Gear, Kawasaki, Kohler, Honda, Briggs & Stratton, Cub Cadet, John Deere, STIHL, and many other leading outdoor power equipment brands.
