Dull or damaged blades turn the simple task of mowing into a difficult chore, resulting in an uneven, ragged lawn finish.
When your Ryobi mower strains, efficiency drops, which harms grass health, increases motor wear, and raises energy consumption—all problems stemming from one small, easily preventable issue.
Installing the correct Ryobi lawn mower replacement blade restores sharpness, balance, and cutting precision, guaranteeing your mower performs at its peak.
We’ve compiled our top blade picks based on thorough testing of cutting efficiency, durability, and real-world results across mulching, bagging, and side-discharge operations.
Whether you need a genuine OEM part or a durable aftermarket mulching blade, here are the 8 Best Ryobi Lawn Mower Replacement Blades to Buy in 2025.
1. Ryobi RAC434 33 cm Lawn Blade – Best Overall
The Ryobi RAC434 is the definitive replacement blade for Ryobi’s compact 33 cm cordless mowers, delivering a flawless, factory-fresh cut.
As a genuine OEM part, it guarantees perfect compatibility with models such as the OLM1833B and RLM18X33B40, simplifying installation and eliminating fitment guesswork.
This blade is specifically engineered to restore the original cutting performance of your mower, solving the common issue of a dull, torn lawn finish.
In real-world tests, the RAC434 provides a crisp and clean shear across various grass types. Its balanced construction minimizes vibration, which helps extend the mower’s motor life and improves battery runtime.
Tailored for maneuverability and efficiency in smaller yards, the RAC434 offers consistent performance, ensuring reliable bagging and discharging without clumping.
For guaranteed performance and peace of mind, this OEM quality blade is the most reliable choice for compatible 33 cm Ryobi owners.
Key Features:
- Diameter: 33 cm (approximately 13 inches).
- Genuine OEM part (Original Equipment Manufacturer).
- Guarantees perfect compatibility and balanced design.
- Compatibility: OLM1833B, RLM18C33B25, RLM18X33B40, and RLM18X33B50.
Pros:
- Perfect OEM fit and integration.
- Restores original cutting performance.
- Easy installation process.
- Crisp and clean shear across various grass types.
Cons:
- Limited model compatibility.
- Basic cutting design (not optimized for mulching).
2. Foifatt 16in Lawn Mower Blade – Best Value for Price
The Foifatt 16-inch blade is a versatile upgrade designed to replace the OEM part 639180003 for Ryobi 40-volt mowers. Crafted from hardened steel, this aftermarket option offers enhanced durability and a longer-lasting edge.
Its key advantage is a multi-functional design that excels at mulching, effectively turning grass clippings into fine, nutrient-rich particles. This solves the hassle of bagging for many homeowners.
Performance analysis showed that this blade created a noticeably finer chop compared to the standard 16-inch Ryobi blade, distributing clippings evenly without leaving clumps.
The blade measures 15.75 inches in length and 1.97 inches in width, precisely engineered for a secure fit on models like the RY40104, P1111, P1100, and P1102.
It provides a clean slice that promotes lawn health, offering superior mulching performance and hardened steel construction at a compelling price point.
Key Features:
- Size: 15.75″ Length, 1.97″ Width, 0.10″ Thickness.
- Material: Hardened steel for enhanced durability.
- Type: Mulching Lawn Mower Blade.
- Compatibility: RYOBI 16″ Lawn Mowers (RY40140, RY40104, P1111, P1100, P1120, P1102).
Pros:
- Excellent mulching capability.
- Hardened steel construction provides durability.
- Great value compared to OEM alternatives.
- Precise fit for compatible 16-inch mowers.
Cons:
- It is an aftermarket part.
- May require balancing upon installation.
3. Ketofa 20in Blade for Ryobi 40V – Best for Durability
Engineered for the serious lawn care enthusiast, the Ketofa 20-inch replacement blade brings customizable, long-lasting performance to Ryobi’s 40V brushless mowers.
Its standout feature is a tungsten carbide-fused edge on a high-quality steel body, which promises exceptional durability and longer intervals between necessary sharpening.
The blade comes unsharpened upon shipment, giving users total control to create a custom edge optimized for their specific grass type. This design focuses heavily on resilience, featuring a powder-coat finish that helps prevent rust.
Measuring 18.5 inches in length and 2 inches in width, it is a direct fit for single-blade 20-inch models such as the RY40190 and RY401110.
This option is ideal for hands-on owners who want to tailor their equipment’s performance from the start and prioritize maximum blade life over out-of-the-box convenience.
Key Features:
- Material: High-quality steel with a tungsten carbide-fused edge.
- Finish: Powder-coat to help prevent rust.
- Size: 18.5 in. Length and 2 in. Width.
- Compatibility: RYOBI RY40180/RY40108 through RY40LM30/RY40LM03.
Pros:
- Tungsten carbide edge for extreme durability.
- Customizable sharpness since it ships unsharpened.
- Powder-coat finish adds protection.
- Ideal choice for maximizing blade life.
Cons:
- Ships unsharpened, requiring initial preparation.
- It is not designed for CrossCut dual-blade systems.
4. Foifatt AC04020 20in Blade – Best Mulching Performance
The Foifatt AC04020 replacement blade is a mulching powerhouse engineered to optimize the performance of Ryobi’s 20-inch 40V brushless mowers.
This sturdy steel, non-original aftermarket blade is designed with an extended cutting surface and an aerodynamic shape that excels at finely chopping and managing grass clippings.
It also features a tungsten carbide coating for a hard, durable cutting surface that resists dulling. In practical use, this blade enhances the mower’s mulching ability by effectively preventing grass from clumping inside the mower deck.
The 18.5-inch blade length is an optimal fit for models like the RY40180 and RY401120, and its design is optimized for cordless mowers, helping to improve cutting efficiency and extend battery runtime.
The powder coating adds durability against rust. This blade is sharpened and ready for immediate installation, making it the premier choice for users prioritizing top-tier clipping management and lawn health.
Key Features:
- Material: Sturdy steel with powder coating.
- Dimensions: 18.5 in. L and 2 in. W.
- Coating: Tungsten carbide coating for durability.
- Function: Improved grass clippings management and superior mulching.
Pros:
- Superior mulching performance.
- Helps extend battery runtime in cordless mowers.
- Reduces grass clumping inside the mower deck.
- Ready for immediate installation (sharpened).
Cons:
- It is an aftermarket part.
- Only available as a single blade.
5. 2 Pack 16in Half-Moon Blade – Best Multi-Pack Option
This two-pack of 16-inch replacement blades offers unbeatable convenience and value, making it the smart choice for proactive homeowners who need a spare on hand.
These hardened steel blades are non-original aftermarket parts designed as direct replacements for OEM part 639180003. They fit popular Ryobi 16-inch mowers such as the RY40104, P1100, P1120, and RY40140.
The multi-functional design provides excellent mulching capabilities, enabling users to nourish their lawn while they mow.
The main advantage is having an immediate, sharp spare available; if one blade becomes dull or damaged mid-season, you can swap it out quickly without any downtime.
Each 15.75-inch blade is built for durability and optimized for cordless efficiency, ensuring a clean cut that prevents overtaxing the mower’s battery.
This multi-pack provides a backup blade and enhanced mulching features for a highly competitive investment, ensuring your mower stays in peak condition all season long.
Key Features:
- Quantity: Two-pack for immediate replacement.
- Size: 15.75″ Length, 1.97″ Width, .10″ Thickness.
- Material: Hardened steel construction.
- Function: Provides enhanced mulching capability.
Pros:
- Excellent value proposition.
- Includes a spare blade to eliminate downtime.
- Enhanced mulching features over standard blades.
- Durable hardened steel construction.
Cons:
- Aftermarket quality control may vary.
- Requires purchasing in bulk.
6. Foifatt 2 Pack 20in Blade – Best 2-Pack for 20in Mowers
The Foifatt 2 Pack 20in Blade is the ultimate maintenance kit for owners of Ryobi’s popular 20-inch 40V brushless mowers. This set provides two high-quality, multi-functional blades made from sturdy, wear-resistant steel.
They are designed to excel at mulching, ensuring you always have a sharp replacement readily available.
These aftermarket 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 on hand eliminates mowing downtime caused by a damaged or dull blade, ensuring your lawn consistently receives a perfect cut.
Optimized for mulching, these blades finely dice clippings to act as a natural fertilizer. This convenient two-pack is the most cost-effective solution for keeping your 20-inch Ryobi mower (including models like RY40180 and RY401120) operating at peak efficiency throughout multiple seasons.
Key Features:
- Quantity: 2-pack.
- Material: High-quality steel.
- Function: Multi-functional design optimized for mulching.
- Compatibility: RYOBI 20-inch models (e.g., RY40180/RY40108, RY401120/RY401012).
Pros:
- Incredible long-term value and practicality.
- Guarantees you always have a spare blade ready.
- Great mulching design for healthier lawns.
- Durable construction built for tough conditions.
Cons:
- Aftermarket fit needs careful verification.
- Requires storage space for the spare blade.
7. AC04024 21in Dual Blade Set – Best for Cross-Cut Mowers
Specifically engineered for Ryobi’s advanced Cross-Cut mowers, the AC04024 blade set is essential for achieving a precision cut on dual-blade models like the RY401150.
This is not a single blade but a dedicated OEM system designed to work in tandem. Made from hardened steel, these blades guarantee the perfect fit and synchronized operation required by the complex 21-inch Cross-Cut deck.
The dual-blade system creates a powerful vortex that lifts grass for a clean, even cut before chopping the clippings into near-powder-fine mulch.
This significantly improves bagging efficiency and overall lawn health. Attempting to use a single blade on these machines is not possible and would cause damage, making the AC04024 set the definitive, non-negotiable component required for proper function and achieving the signature Cross-Cut finish.
Key Features:
- Size: 21 inches.
- Blade Type: Dedicated CROSS-CUT Multi-Blades (dual set).
- Material: Hardened steel.
- Function: Superior cutting, bagging, and mulching via tandem operation.
- Compatibility: RY401150/RY401015 through RY401220/RY401022.
Pros:
- Required for proper function of Cross-Cut mowers.
- Superior mulching performance.
- Enhanced bagging efficiency.
- Genuine OEM parts ensure perfect fit.
Cons:
- Only fits dual-blade mowers (highly specific fit).
- Involves a higher replacement cost due to the set.
8. Ryobi 16 Inch Lawn Mower Blade – Best Budget Friendly
The standard Ryobi 16 Inch Lawn Mower Blade provides reliable cutting performance and is often the best choice for budget-conscious consumers who prioritize basic functionality.
This blade is made from steel and is compatible with 16-inch Ryobi mowers, including models like P1102, P1100, and RY40104. Standard blades are ideal for regular mowing and are best suited if you primarily rely on bagging your clippings.
While aftermarket options like Foifatt provide enhanced mulching, this standard OEM or standard replacement blade offers a clean cut and is a straightforward solution to replace dull or damaged parts.
Always ensure the blade matches your mower’s 16-inch deck size and mounting specifications, which typically include a 7/8 inch center hole.
Choosing this standard option ensures compatibility and maintains cutting efficiency without the added cost of specialized mulching features.
Key Features:
- Size: 16 inches in length.
- Type: Standard blade (best for regular mowing and bagging).
- Material: Steel construction.
- Compatibility: P1102, P1100, RY40104.
Pros:
- Best budget-friendly option.
- Provides a reliable, clean cut.
- Ideal for efficient bagging and discharge.
- Genuine Ryobi component available.
Cons:
- Does not offer specialized mulching capability.
- May not be made of hardened or tungsten steel.
Detailed Buying Guide: How to Choose the Right Ryobi Lawn Mower Replacement Blade
Selecting the correct Ryobi lawn mower replacement blade is crucial for achieving clean cuts, ensuring optimal mower performance, and extending the life of your equipment.
When browsing options—whether OEM or trusted aftermarket brands like Foifatt and Ketofa—it is important to focus on key factors that align with your specific mower model and lawn care routine.
1. Match Your Mower Model and Size
The most critical factor is compatibility. Ryobi mowers come in 16″, 20″, and 21″ deck sizes, and these blades are not interchangeable across sizes.
- Check the Model Number: Always reference your mower’s model number (e.g., RY40104, RY40180, RY401150) to guarantee the blade will fit.
- Size Examples: 16″ blades fit models like P1102 and RY40104, while 20″ blades are designed for 40V brushless models like RY40180.
- Avoid Damage: Using the wrong size can significantly reduce cutting efficiency or potentially damage your mower.
2. Choose the Right Blade Type
Different blades are engineered to offer different cutting actions based on your preferred mowing style.
- Standard Blades: These blades provide a clean cut and are best for regular mowing and efficiently bagging clippings.
- Mulching Blades: Blades from Foifatt and Ketofa are examples of mulching blades. They are designed to cut grass into fine clippings that decompose quickly, acting as natural fertilizer to promote lawn health. If you prioritize low maintenance and healthier grass, a mulching blade is the best choice.
- Dual-Blade Sets: Used for specialized CrossCut mowers (like the AC04024 set), these systems enhance mulching, bagging, and overall cutting performance.
3. Prioritize Blade Material and Durability
The material determines the blade’s longevity and how often you will need to sharpen or replace it.
- Hardened Steel/Tungsten Carbide: High-quality materials like hardened steel or tungsten carbide-coated blades (seen in some Ketofa models) resist wear and require less frequent sharpening.
- Powder Coating: A powder-coated finish helps prevent rust and corrosion, further extending the blade life.
- Aftermarket Value: Aftermarket options often provide comparable durability and performance to OEM parts but at a lower cost.
4. Check Mounting Specifications
Ensure the physical connection points match your mower’s spindle for a proper, safe installation.
- Center Hole: The center hole size is typically 7/8″ for Ryobi push mower decks.
- Fitment: An improper fit, including incorrect center hole size or blade shape, can cause dangerous vibration, uneven cuts, and safety hazards.
5. Consider Value and Quantity
For frequent users, quantity can offer long-term savings.
- Multi-Packs: If you mow often, a 2-pack (like the Foifatt 16″ or 20″ options) offers excellent value, providing a spare blade ready to go immediately.
- OEM vs. Aftermarket: OEM blades guarantee reliable, perfect compatibility but usually cost more. Aftermarket brands provide performance at a better value for budget-conscious buyers.
Always replace your blade when it becomes dull or damaged to maintain cutting efficiency and protect your mower’s motor.