Kobalt Lawn Mower Blade Comparison: Specs, Sizing, and Fitment Guide

Best for: Kobalt 80V cordless mower owners

Pros

• Tough 40MnB high carbon steel
• Includes 15mm installation socket
• Double anti-rust paint coating
• Convenient two-blade value pack

Cons

• Incompatible with corded models

The 21” Mower Blade Replacement for Kobalt is designed for 21-inch cordless decks, offering direct fitment on Kobalt 80V mowers such as the KM-2180B-06, KM-5080-06, and KM-2041B-06. If you require a heavy-duty kobalt 80v mower blade, this unit matches the original deck geometry with an overall length of 20.08 inches. It features a 0.72-inch round center arbor hole accompanied by two heart-shaped side alignment holes that lock securely over the motor shaft drive pins.

Constructed from one-piece industrial-grade 40MnB high-carbon steel, the blade retains sharpness through dense turf and tough weeds. The manufacturer notes that this cutting profile shreds grass finer to boost bagging efficiency by thirty percent while reducing repeated trimming passes. Each blade is coated in a double-layer black anti-rust paint to prevent corrosion from damp clippings. The bundle includes two complete blades alongside a 15mm installation socket for fast setup.

This replacement set suits homeowners maintaining medium to large yards with an 80V Kobalt mower who prefer having a spare blade ready for rotation. However, it gives way to dedicated corded blades like part 29493 if your mower runs on a 13-amp corded motor without heart-shaped hub alignment pins.

• Forged from industrial-grade 40MnB high-carbon steel in a one-piece design
• Features a 20.08-inch length, 0.72-inch center hole, and heart-shaped side holes
• Treated with a double-layer black anti-rust protective coating
• Packaged as a 2-pack value set including a 15mm installation socket

Best for: Corded Kobalt and Greenworks push mowers

Pros

• Durable 40 manganese steel
• Matches OEM part 33313250
• Comes in a two-pack bundle

Cons

• Shorter 19.6-inch cut length
• Lacks heart-shaped alignment holes

The BeadChica 20″ Mower Blade 25022 is an aftermarket replacement engineered for corded electric walk-behind mowers. Measuring 19.6 inches in length, 1.95 inches in width, and 4 millimeters in thickness, it serves as a direct alternative for OEM part number 33313250. This blade fits Kobalt and related corded decks where a compact cutting circle is required to prevent inner housing contact.

Manufactured from 40 manganese steel, this blade delivers high wear resistance and toughness against hidden lawn debris. Its tool-free replacement configuration matches factory motor spindles for an uncomplicated swap. If you are comparing deck systems to a greenworks lawn mower blade 21 inch, checking your existing part number against 33313250 is vital before ordering. The package includes two blades ready for immediate installation.

This package suits owners of compact corded electric mowers who want a multi-pack of durable blades for routine lawn upkeep. It gives way to larger 20.08-inch models like the Wuples or perfektGarten designs if you operate high-voltage cordless Kobalt decks with heart-shaped drive pins.

• Built from durable 40 manganese steel for wear resistance and clean cuts
• Measures 19.6 inches long, 1.95 inches wide, and 4mm thick
• Direct replacement for original OEM blade part number 33313250
• Supplied as a 2-pack for fast blade replacement and backup storage

Best for: Single-blade replacement on 80V decks

Pros

• Forged 40MnB carbon steel
• Includes 15mm socket tool
• Protective dual anti-rust finish

Cons

• Single blade per package

The 21Inch Mower Blade Replacement for Greenworks provides a single-pack cutting option compatible with Kobalt 80V 21-inch mowers, including the KM2180B-06, KM-5040-06, and KM5080-06. Measuring 20.08 inches in length, this blade features a 0.72-inch center mounting hole and dual heart-shaped alignment apertures to match Kobalt cordless drive plates.

Crafted from one-piece 40MnB boron-alloy high-carbon steel, the blade resists edge deformation when cutting tough grass and weeds. According to the listing specifications, the cutting edge improves bagging efficiency by thirty percent through finer mulching action. A double-layer black anti-rust finish protects the steel against oxidation caused by wet lawn maintenance. The single blade comes equipped with a 15mm installation socket to facilitate a five-minute swap.

This blade suits property owners who only need an individual replacement blade rather than a multi-pack bundle. It gives way to the dual-pack Wuples offering for users who prefer keeping an immediate spare on hand, or to corded models if your machine lacks heart-shaped drive lugs.

• Forged from one-piece industrial-grade 40MnB high-carbon steel
• Features a 20.08-inch length and 0.72-inch center hole with heart-shaped cutouts
• Coated with double-layer anti-rust paint for moisture protection
• Shipped as a single blade containing a 15mm installation socket

Best for: Mowers requiring 0.708-inch arbor fit

Pros

• Hardened 40 manganese steel
• Precision 0.708-inch center hole
• Sharp edge for clean cutting

Cons

• Installation socket not included
• Single blade pack only

The 21 inch Mower Blade Replace from Dichallu is a single-pack steel blade tailored for 21-inch electric cutting decks. The blade measures 20.08 inches in length, 1.97 inches in width, and 0.126 inches in thickness. It is machined with a 0.708-inch center hole designed to seat securely on compatible motor shafts without excessive play.

Constructed from 40 manganese steel, this blade delivers consistent toughness and wear resistance under standard mowing conditions. A sharp blade is critical to avoid ragged grass cuts that turn brown and invite turf disease. When shopping for cutting components, much like selecting an ego lawn mower blade, confirming center hole tolerances against your spindle hub is necessary to maintain proper balance. The listing notes that routine blade replacement ensures clean, even cutting performance.

This model suits gardeners needing a single, tough manganese steel blade with a 0.708-inch arbor diameter. It gives way to the perfektGarten or Wuples options if your mower utilizes an 18.4mm (0.72-inch) arbor with dedicated heart-shaped positioning holes.

• Manufactured from durable 40 manganese steel for dependable toughness
• Features dimensions of 20.08 inches long, 1.97 inches wide, and 0.126 inches thick
• Machined with a 0.708-inch center mounting hole
• Supplied as an individual black replacement blade

Best for: Precision mulching on 40V and 80V decks

Pros

• Heat treated to 45 HRC
• Strict 510mm metric dimensions
• Versatile 3-in-1 aerodynamic profile
• Direct replacement for part 2903402

Cons

• No mounting socket included

The perfektGarten 51 CM lawnmower mulching blade is a precision-engineered cutting tool built for Kobalt cordless models. It delivers verified compatibility with the Kobalt KM-2041B-06 kMP, KM-5040-06 40V, KM-2180B-06, and KM-5080-06 80V platforms. It serves as a direct technical replacement for OEM part numbers 2903402, GLB 333041179, and GLB333041179.

The blade spans exactly 510 millimeters (20.08 inches) in length, 50 millimeters in width, and 3 millimeters in thickness. Its central arbor opening measures 18.4 millimeters (0.724 inches), flanked by heart-shaped side alignment holes positioned exactly 70 millimeters center-to-center. Made from certified carbon-bearing steel, this blade undergoes heat treatment through quenching and tempering to achieve a hardness of 45 HRC. Its curved 3-in-1 profile is specifically configured for grass throwing, catching, and fine mulching.

This blade suits detail-oriented homeowners maintaining Kobalt 40V or 80V mowers who require exact metric tolerances and high Rockwell hardness for demanding turf conditions. It gives way to corded-specific blades if you own a 13-amp electric push mower that cannot accommodate a 510mm length or 18.4mm arbor.

• Exact metric dimensions: 510mm length, 50mm width, and 3mm thickness
• Features an 18.4mm center hole and heart-shaped side holes with 70mm spacing
• Quenched and tempered carbon steel construction rated at 45 HRC
• Designed with a 3-in-1 cutting profile for throwing, catching, and mulching

Best for: Kobalt 13-amp corded electric push mowers

Pros

• Genuine Kobalt factory part 29493
• Hardened steel blade stock
• Rust-resistant surface finish

Cons

• Incompatible with 40V and 80V cordless decks

The Kobalt 21-in Multipurpose Push Lawn Mower blade is an authentic factory replacement bearing model number 29493. It is engineered specifically for Kobalt item number 506579, which covers the Kobalt 13-amp 21-inch corded electric push lawn mower models KM210-06 and KM211-06. Installing this blade restores the factory cutting performance and air lift intended by the original manufacturer.

Constructed from hardened steel with a rust-resistant finish, the kobalt 29493 blade provides durable service across routine lawn maintenance tasks. At an item weight of 1.35 pounds, this 21-inch blade maintains the proper rotational momentum without placing undue strain on the 13-amp electric motor. Just as balance is vital when operating a skil lawn mower, using the exact OEM blade on your corded Kobalt chassis ensures smooth operation and extended motor life.

This model is the premier choice for owners of corded Kobalt KM210-06 and KM211-06 push mowers who prefer genuine brand-name components. It gives way to models like the BeadChica or Wuples if you require an aftermarket blade configuration for 40V or 80V cordless platforms.

• Genuine Kobalt factory replacement blade model number 29493
• Engineered specifically for 13-amp corded models KM210-06 and KM211-06
• Constructed from durable hardened steel with rust-resistant protection
• Weighs 1.35 pounds to match factory motor load requirements