Kobalt 21-inch Multipurpose Push Mower Blade — Hardened Steel, Rust-Resistant Finish

Kobalt's 21-inch hardened steel multipurpose push mower blade fits KM210-06 and KM211-06 models and delivers balanced cutting performance with a rust-resistant finish.

This replacement blade is designed specifically for Kobalt corded electric push mowers (item #506579, models KM210-06 and KM211-06). It swaps in quickly to restore cutting efficiency after dulling or damage, and its multipurpose profile is built to handle common lawn tasks while maintaining balance and reliability. The blade’s hardened steel construction and protective finish help extend service life and resist surface corrosion from wet grass and storage conditions.

How will this blade affect my mower's cutting performance?

Installing a sharp, balanced multipurpose blade improves cut quality by shearing grass cleanly and reducing tearing. That promotes healthier regrowth and a more even lawn appearance without needing a higher-powered engine.

• 21-inch cutting width matches Kobalt 21-in decks for full coverage per pass.
• Multipurpose profile designed for both discharge and light mulching.
• Hardened steel edge keeps sharpness longer than soft stamped blades.
• Balanced design reduces vibration for steadier operation.

Will this blade fit my mower model and how easy is installation?

This blade is made to fit Kobalt item number 506579: the corded electric push mowers KM210-06 and KM211-06 with a 21-inch deck. Installation is straightforward with basic tools and follows the same mounting pattern as the original factory blade.

• Direct replacement for KM210-06 and KM211-06 models—no modification required.
• Same bolt hole pattern and center bore for simple swap-out.
• Use a wrench and follow manufacturer's torque guidance for safe mounting.
• Remove spark or power source per safety instructions before replacing.

What materials and finishes does the blade use, and why do they matter?

The blade is made from hardened steel to resist bending and wear under normal mowing loads. A rust-resistant surface finish protects against corrosion from wet grass clippings and outdoor storage, helping maintain balance and edge life.

• Hardened steel resists deformation and extends service intervals.
• Rust-resistant coating reduces surface oxidation and pitting.
• Consistent weight distribution preserves mower balance and reduces vibration.
• Durability lowers the frequency of blade replacements over time.

Who is this for: This replacement blade is intended for Kobalt 21-inch corded push mower owners who need a direct-fit, durable option to restore cutting performance. It's well suited to homeowners with small-to-medium lawns who want cleaner cuts, less vibration, and a rust-resistant finish for longer blade life. Ideal for anyone replacing a worn or damaged blade on models KM210-06 or KM211-06 who prefers a simple, bolt-on upgrade.