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Description
05900043 – Ariens / Gravely Hex Bolt (BLT-HEX .44-20 × 2.75, Grade 5, Yellow Zinc EP80)
The Ariens / Gravely 05900043 is a genuine OEM Grade 5 hex head bolt engineered for high-strength fastening in engine, clutch, and drive assemblies on Ariens® and Gravely® zero-turn mowers. Manufactured to OEM specifications, this bolt delivers reliable clamping force and durability in high-vibration, high-load environments typical of engine and PTO clutch mounting locations.
Finished with yellow zinc (YZ) EP80 coating, the bolt provides enhanced corrosion resistance while maintaining consistent torque characteristics and long-term service performance.
Key Details
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Part Number: 05900043
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Brand: Ariens / Gravely
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Part Type: Hex Head Bolt
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Thread Size: .44-20 (7/16-20 UNF)
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Length: 2.75 in
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Grade: Grade 5
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Finish: Yellow Zinc (YZ), EP80
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Head Style: Hex
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Function: Secures engine, clutch, and drive components
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OEM Status: Genuine Ariens / Gravely replacement part
Applications & Compatibility
This hex bolt is used in engine and clutch mounting as well as clutch and drive assemblies on the following Ariens / Gravely mower platforms:
Gravely Max Zoom® Series
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Max Zoom 48
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Engine and Clutch
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Clutch and Drive (varies by serial range)
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Max Zoom 52
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Engine and Clutch
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Clutch and Drive (varies by serial range)
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Max Zoom 60
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Engine and Clutch
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Clutch and Drive (varies by serial range)
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(Applies to listed Briggs & Stratton® and Kohler® engine configurations within the specified production ranges.)
Product Highlights
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Grade 5 strength for secure engine and clutch retention
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Yellow zinc EP80 finish helps resist corrosion
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Precision thread and length for correct OEM fitment
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Designed for high-vibration mower drivetrain applications
The 05900043 Ariens / Gravely hex bolt is a critical OEM fastener for maintaining proper engine and clutch alignment, ensuring dependable power transfer and long-term reliability in Max Zoom series zero-turn mowers.

