8 Best Ryobi Lawn Mower Replacement Blades to Buy in 2025

Delivering a flawless, factory-fresh cut, the Ryobi RAC434 is the definitive replacement blade for Ryobi’s compact 33cm cordless mowers. As a genuine OEM part, it guarantees perfect compatibility with models like the OLM1833B and RLM18X33B40, eliminating any guesswork or fitment issues. This blade is engineered specifically to restore the original cutting performance of your mower, solving the common problem of a dull, torn lawn finish with one simple swap.

In real-world testing, the RAC434 provides a crisp and clean shear across various grass types, from fine fescue to tougher ryegrass. Its balanced construction ensures minimal vibration, which helps extend the mower’s motor life and improves battery runtime. The blade’s 33cm cutting width is perfectly matched to its intended mower decks, ensuring even passes and preventing uncut strips that can plague ill-fitting aftermarket alternatives. Its performance is consistent, offering reliable bagging and discharging without clumping.

For owners of compatible 33cm Ryobi mowers, the RAC434 is the most straightforward and reliable choice. While aftermarket options may exist, they cannot promise the perfect integration and balanced performance of this genuine part. Compared to the larger aftermarket blades designed for 16-inch or 20-inch mowers, this blade is tailored for maneuverability and efficiency in smaller yards. For guaranteed performance and peace of mind, the Ryobi RAC434 offers unmatched OEM quality.

Elevating the standard replacement, the Foifatt 16-inch blade is a versatile upgrade for Ryobi 40-volt mowers. Designed to replace the OEM part 639180003, it’s crafted from hardened steel for enhanced durability and a longer-lasting edge. Its key advantage is a multi-functional design that excels at mulching, turning grass clippings into fine, nutrient-rich particles that feed your lawn, solving the hassle of bagging for many homeowners.

In our performance analysis, this blade’s mulching capability was immediately apparent. It created a noticeably finer chop compared to the standard Ryobi 16 Inch Blade, distributing clippings evenly without leaving clumps. The 15.75-inch length and 1.97-inch width are precisely engineered for a secure fit on models like the RY40104 and P1100. This aftermarket blade holds its own in terms of cut quality, providing a clean slice that promotes lawn health.

This Foifatt blade is ideal for the homeowner seeking more than just a replacement; it’s an enhancement. It directly competes with the OEM Ryobi blade by offering superior mulching performance and hardened steel construction, often at a more compelling price point. For those who value lawn health and prefer to mulch rather than bag, this blade provides a significant functional upgrade over the stock option.

Engineered for the enthusiast, the Ketofa 20-inch replacement blade brings customizable, long-lasting performance to Ryobi’s 40V brushless mowers. Its standout feature is the tungsten carbide-fused edge on a high-quality steel body, promising exceptional durability and longer intervals between sharpening. Uniquely, this blade ships unsharpened, giving users total control to create a custom edge optimized for their specific grass type, a feature that serious lawn care aficionados will appreciate.

This blade’s design focuses on resilience. The powder-coat finish helps prevent rust, and the robust construction is built to withstand tough conditions. Measuring 18.5 inches in length, it’s a direct fit for single-blade 20-inch models like the RY40190 and RY401110, but it is critical to note it does not fit CrossCut dual-blade systems. The unsharpened delivery requires initial preparation, but the payoff is a personalized cutting angle that can outperform pre-sharpened blades.

Compared to the Foifatt AC04020 blade, the Ketofa model targets a different user. While both offer enhanced durability, the Ketofa blade is for the hands-on owner who wants to tailor their equipment’s performance from the start. It’s the ideal choice for those who see blade sharpening as part of their routine and prioritize maximum blade life over out-of-the-box convenience.

The Foifatt AC04020 replacement blade is a mulching powerhouse designed to optimize the performance of Ryobi’s 20-inch 40V brushless mowers. This blade is engineered with an extended cutting surface and an aerodynamic shape that excels at finely chopping grass clippings and returning them to the lawn. It features a tungsten carbide-fused edge for a hard, durable cutting surface that resists dulling and promotes a healthier, cleaner cut without tearing grass blades.

In practical use, this blade transforms the mower’s mulching ability. It effectively prevents grass from clumping inside the mower deck, a common frustration that forces frequent stops for cleaning. The 18.5-inch blade length is a perfect fit for models like the RY40180 and RY401120, and its design is specifically optimized for cordless mowers, helping to improve cutting efficiency and extend battery runtime. The powder coating adds an extra layer of durability against rust and corrosion.

This Foifatt blade is the premier choice for users who prioritize top-tier mulching. While the Ketofa 20in Blade offers similar durable materials, the Foifatt AC04020 is sharpened and ready for immediate installation, focusing entirely on superior clipping management. For anyone looking to enhance their lawn’s health by mulching, this blade offers better performance than many stock options.

Offering unbeatable convenience and value, this two-pack of 16-inch replacement blades is the smart choice for proactive homeowners. These hardened steel blades are designed as direct replacements for OEM part 639180003, fitting popular Ryobi 16-inch mowers like the RY40104. The multi-functional design provides excellent mulching capabilities, allowing you to nourish your lawn while you mow, a significant upgrade over standard blades.

The primary advantage here is having an immediate, sharp spare on hand. When one blade inevitably hits a rock or becomes dull mid-season, you can swap it out in minutes without any downtime or a trip to the store. Each 15.75-inch blade is built for durability and optimized for cordless efficiency, ensuring a clean cut that doesn’t overtax your mower’s battery. The performance is identical to the single Foifatt 16in blade, delivering great mulching and a healthy lawn finish.

This multi-pack fundamentally changes the value equation for mower maintenance. Compared to purchasing a single OEM Ryobi 16 Inch Blade, this two-pack provides a backup blade and enhanced mulching features for a highly competitive investment. It is the perfect option for anyone who values preparedness and wants to keep their mower in peak condition all season long.

This Foifatt two-pack is the ultimate maintenance kit for owners of Ryobi’s popular 20-inch 40V brushless mowers. It provides two high-quality, multi-functional blades designed to excel at mulching, ensuring you always have a sharp replacement ready to go. Made from sturdy, wear-resistant steel, these blades are built to withstand tough mowing conditions while providing a clean, efficient cut that improves lawn health and mower runtime.

Having a spare blade is a game-changer for lawn care. A dull or damaged blade can be swapped out instantly, eliminating mowing downtime and ensuring your lawn always gets a perfect cut. Like the single Foifatt AC04020 blade, these are optimized for mulching, finely dicing clippings to act as a natural fertilizer. This convenient pack ensures your mower, whether it’s an RY40180 or RY401120 model, consistently performs at its best.

For high-usage mower owners, this two-pack offers superior value and practicality compared to buying single blades. While a single Ketofa blade provides customizable sharpness, this Foifatt pack delivers out-of-the-box performance and long-term convenience. It’s the most cost-effective solution for keeping your 20-inch Ryobi mower operating at peak efficiency throughout multiple seasons.

Specifically engineered for Ryobi’s advanced Cross-Cut mowers, the AC04024 blade set is the only solution for a precision cut on dual-blade models like the RY401150. This is not a single blade but a dedicated system designed to work in tandem, delivering exceptionally fine mulching and superior bagging performance. Made from hardened steel, these OEM blades guarantee the perfect fit and synchronized operation required by the complex 21-inch Cross-Cut deck.

The performance of the dual-blade system is in a class of its own. The stacked blades create a powerful vortex that lifts grass for a clean, even cut before chopping the clippings into near-powder-fine mulch. This dramatically improves bagging efficiency and lawn health. Attempting to use a single blade, like those for the 20-inch mowers, on these machines is not possible and would damage the mower, making this specific AC04024 set essential.

This blade set is for a very specific user: the owner of a Ryobi 21-inch dual-blade mower. There is no trade-off or alternative; it is the required part for proper function. Unlike single-blade options that offer a choice between brands, the AC04024 is the definitive, non-negotiable component for achieving the signature Cross-Cut finish.