140-4858 – Toro 18.00" Atomic Replacement Blade 1-Point (OEM-Spec)
The Toro 140-4858 Atomic Blade is a genuine Toro replacement mower blade engineered to meet OEM standards for cutting efficiency, airflow, and durability. Featuring an 18.00-inch cutting length and a 1-point (1P) mounting design, this Atomic-style blade is crafted to enhance airflow within the mower deck for superior grass lift, improved discharge, and efficient mulching performance. Built to Toro’s exact specifications, the 140-4858 blade helps restore original cutting quality and reliable operation on compatible Toro lawn and turf equipment.
Product Details
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Manufacturer Part Number: 140-4858
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Brand: Toro
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Part Type: Mower Blade
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Blade Length: 18.00 inches
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Blade Style: Atomic (enhanced airflow design)
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Mounting Type: 1-Point (1P)
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Application: Lawn & garden equipment, Toro mowers (model specific)
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Material: Hardened steel
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OEM Status: Genuine Toro replacement
Function
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Delivers clean, precise cutting performance
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Enhances airflow for superior grass lift and discharge
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Supports efficient mulching and clipping movement
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Maintains balanced blade rotation to reduce vibration
Compatible With
The Toro 140-4858 18.00" Atomic Blade (1P) is used on select Toro residential mowing equipment, including:
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Toro walk-behind mowers requiring an 18-inch Atomic blade
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Toro equipment specified to use blade part number 140-4858
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Mowers designed for this blade length, mounting style, and airflow profile
Exact compatibility depends on mower model and serial number. Always verify blade length and mounting configuration before ordering.
How It’s Used
This replacement blade installs directly onto the mower spindle in place of the existing blade. Typical installation steps include:
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Disconnect the spark plug or power source before servicing.
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Raise and secure the mower deck.
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Remove the blade retaining bolt and hardware.
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Install the Toro 140-4858 blade with the cutting edge facing the correct direction.
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Torque mounting hardware to Toro-specified values.
Proper installation ensures safe operation, improved airflow, and consistent cutting quality.
Suggested Maintenance
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Inspect blade edges for dullness, nicks, or damage
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Sharpen or replace blades when cutting performance declines
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Check blade mounting hardware for secure torque
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Replace blades as part of regular seasonal maintenance
The Toro 140-4858 18.00" Atomic Replacement Blade (1P) is a dependable OEM-spec solution designed to deliver enhanced airflow, efficient cutting, and lasting durability—ideal for keeping compatible Toro mowers operating at peak performance.

