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Description
06538400 — Lock Nut 1.0-14 YWZC (Genuine OEM Ariens / Gravely Part)
The 06538400 lock nut is a genuine OEM Ariens / Gravely fastener engineered for high-load structural applications such as steering axles, rear axles, and mower frames. With a 1.0-14 thread size and yellow zinc coating (YWZC), this nut provides excellent corrosion resistance and secure retention in heavy-duty commercial equipment.
This part is commonly used in axle and frame assemblies where strength, durability, and vibration resistance are critical.
Key Details
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Manufacturer Part Number: 06538400
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Part Name: Lock Nut
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Brand: Ariens / Gravely
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Thread Size: 1.0-14
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Finish: Yellow Zinc Coated (YWZC)
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Part Type: Locking hex nut
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Function: Secures axle and frame components under heavy load
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Installation: Direct OEM replacement
Applications
The Ariens / Gravely 06538400 lock nut is used extensively in steering axle assemblies, rear axles, and mower frames, especially on larger commercial zero-turn and out-front models.
Compatibility
Gravely Commercial Models
Steering Axle Assembly
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PM460, 30hp Kubota
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989055
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989056 (4WD Assist)
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989057
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989304
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989305 (4WD Assist)
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989306
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Rear Axle
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PM360, 22hp Yanmar – 990010
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PM360, 22hp Kawasaki – 990016
Frame Assemblies
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PM250Z (20hp B&S / 22hp Robin / 25hp Kohler, 50" Deck, Hydraulic Lift)
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992018
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992021
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992023
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992305
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PM260Z (22hp–25hp Kohler / Robin, 60" Deck, Hydraulic Lift)
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992020
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992022
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992024
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PM272Z (25hp Kohler, 72" Deck, Hydraulic Lift)
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992027
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These applications span multiple serial number ranges, covering both early and later production units.
Why Use Genuine OEM 06538400
Choosing the OEM Ariens / Gravely 06538400 lock nut ensures:
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Proper thread engagement on 1.0-14 fasteners
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Reliable locking under vibration and torque
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Correct fit for axle and frame assemblies
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Long service life in commercial mowing conditions
This nut is designed to meet factory strength and safety requirements, making it the correct replacement for Gravely and Ariens commercial equipment.
