5901820 – Gravely Hex Bolt 7/16″-20 x 4.50″ NYTORQ (OEM-Spec)
The Gravely 5901820 Hex Bolt is a genuine OEM-spec fastener engineered for secure, high-strength assembly in Gravely commercial mower and turf equipment. Featuring a 7/16″-20 thread size and 4.50″ length, this heavy-duty bolt includes a NyTORQ (nylon-insert) locking feature that helps resist vibration loosening in high-load applications. Manufactured to Gravely’s exact specifications, the 5901820 bolt delivers reliable clamping force, excellent shear strength, and long-term durability—critical for structural components, deck assemblies, and drivetrain mounting points.
Product Details
Manufacturer Part Number: 5901820
Brand: Gravely (OEM-Spec)
Part Type: Hex Head Bolt (Nylon-Insert Lock)
Thread Size: 7/16″-20 UNF
Length: 4.50″
Head Style: Hex
Lock Type: NyTORQ (nylon locking patch/insert)
Grade/Strength: Grade 8 (high tensile)
Function: Secure, vibration-resistant fastening
Application: Structural, deck, and drivetrain assemblies on Gravely equipment
Function
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Provides high-strength clamping force for critical connections
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Nylon locking feature helps resist loosening from vibration
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Grade 8 strength suited for heavy-duty mower and deck assemblies
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Hex head design allows torque application with standard tools
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Helps maintain safe, secure assembly in demanding turf environments
Compatible With
The Gravely 5901820 Hex Bolt is used on select commercial Gravely equipment applications, including:
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Mower deck mounting points requiring a 7/16-20 x 4.50″ locking bolt
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Structural and drivetrain components subjected to vibration and load
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Assemblies specified in Gravely parts diagrams calling for part number 5901820
Note: Always verify bolt size, thread, and length against your specific model and parts manual before ordering to ensure compatibility.
How It’s Used
This hex bolt installs into threaded components to clamp parts together:
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Expose Assembly: Park mower on level ground, shut off engine, and disconnect spark plug/battery.
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Align Components: Position parts that require fastening (deck brackets, frames, etc.).
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Insert Bolt: Slide the 7/16-20 x 4.50″ bolt through aligned holes.
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Engage Threads: Begin threading into the mating threaded hole or nut.
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Torque Correctly: Tighten to manufacturer-specified torque using a calibrated torque wrench.
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Verify Fit: Check that the bolt head seats squarely and components are secure.
Proper torque and thread engagement ensure a vibration-resistant joint.
Suggested Maintenance
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Periodically inspect critical fasteners for tightness, especially after initial service intervals
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Check for signs of thread wear, corrosion, or loosening under vibration
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Replace if nylon locking is compromised or if threads are damaged
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Use OEM-spec Grade 8 fasteners when replacing to retain structural integrity
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Avoid over-tightening, which can strip threads or damage components
The Gravely 5901820 Hex Bolt 7/16-20 x 4.50″ NyTORQ (Grade 8) is a robust OEM-spec fastener designed to deliver vibration-resistant clamping, high tensile strength, and long-lasting performance—ideal for maintaining reliable assembly on compatible Gravely commercial turf equipment.