Ryobi 20-Inch Mower Blades: Which Replacement Fits Your Deck?

Best for
DIYers wanting custom edges on AC04020 decks

The AC04020 Blades for RYOBI 20-inch Deck provides an exact match for Ryobi’s ubiquitous AC04020 specification. Manufactured by GardTok under model number PG629-US, this single blade is designed explicitly for Ryobi 40V brushless models including the RY40180 (RY40108), RY40190 (RY40109), RY401110 (RY401011), RY401120 (RY401012), and the RY40LM30 (RY40LM03) series. The center mounting interface features a reinforced design combining a half-moon indexing cutout with a round mounting hole. This precise geometry prevents slippage, bowing, or plastic deck bracket warping during high-torque startup sequences.

In terms of cutting performance, this ryobi 40V mulching blade incorporates a high-lift trailing wing profile that generates substantial updraft inside the 20-inch mowing chamber. By lifting grass blades erect before the extended cutting edge strikes, it slices clippings into fine particles that settle quickly into turf soil as natural fertilizer. The listing notes that the blade arrives unsharpened with a heavy-duty powder-coat finish designed to prevent corrosion during shipping and storage. This design choice suits DIY users who prefer grinding their own cutting bevel to match particular turf varieties, but it gives way to pre-sharpened options if you lack grinding equipment.

• Engineered to replace OEM part number AC04020 across RY40180, RY40190, RY401110, and RY40LM30 platforms
• Reinforced center hole with a half-moon and round mounting interface to eliminate bracket distortion
• High-lift aerodynamic profile with an extended cutting edge for thorough mulching and clipping breakdown
• Ships with an unsharpened safety edge protected by a rust-resistant powder-coat finish

Best for
Homeowners wanting ready-to-mow two-pack convenience

The SummerCool AC04020 2 Pack Mower Blades addresses the primary complaint of aftermarket blade maintenance by delivering two pre-sharpened replacement blades in a single package. Designed for 20-inch Ryobi 40V brushless platforms, these blades directly service models RY40180, RY40190, RY401110, RY401120, and RY40LM30. SummerCool measures each blade at 19.25 inches in length, 1.97 inches in width, and 0.106 inches in thickness, with a standard round center mounting hole measuring 0.886 inches. The heavy-duty steel build provides dependable structural rigidity when powering through thick, overgrown grass patches.

Because these blades arrive pre-sharpened from the factory, they eliminate the preparation step required by unfinished safety edges. You can unbox one blade, bolt it to your Ryobi spindle using standard shop gloves, and keep the second unit on a workshop shelf for mid-season rotation. Note that this blade utilizes a standard circular mounting interface and is explicitly not compatible with CrossCut dual-blade decks or spindles requiring an opposed half-moon and square mounting pattern. If your deck utilizes multi-brand legacy hardware patterns, this setup yields to multi-hole alternatives.

• Dual-blade pack provides a ready spare for quick mid-season maintenance rotations
• Pre-sharpened cutting edge allows for immediate installation without grinding tools
• Standard 0.886-inch circular center mounting hole tailored for single-blade AC04020 decks
• Double-suction mulching geometry lifts grass clippings efficiently for clean bagging or mulching

Best for
Owners of older multi-hole cordless mowers

The Belleone Mulching Mower Blade Compatible with Ryo focuses on expansive cross-compatibility across older Ryobi models and related cordless yard tools. Sized at an overall length of 18 3/4 inches (with listing dimensions of 19.21 by 1.97 inches and a 0.12-inch thickness), this blade serves as an aftermarket replacement for Ryobi part numbers 635373 and 33120BDB, as well as OEM 514061-49. Deck fitment includes Ryobi models RY40190, RY401110, and RY401120, alongside select CM and MM electric mower decks.

The distinguishing feature of this ryobi 20 inch mower blade replacement is its multi-hole arbor plate. The interface incorporates a primary circular center hole, an outer half-moon alignment cutout, and an additional small locating pin hole. This layout guarantees positive mechanical indexing on older spindle hub styles where single-hole blades might slip under load. Belleone designed the cutting curve to deliver a smooth cut that minimizes deck turbulence, splash, and operating noise. The manufacturer advises checking blade balance periodically and sharpening the cutting surfaces regularly to maintain optimum motor efficiency.

• Replaces legacy OEM part numbers 514061-49, 635373, and 33120BDB
• Multi-hole mounting design featuring a central circular hole, half-moon cutout, and small alignment hole
• Engineered blade curvature minimizes deck splash, operating vibration, and motor noise
• Compatible across Ryobi RY40190, RY401110, and RY401120 cordless walk-behind mowers

Best for
Annual refresh on PBLLM05 brushless decks

Best for
Operators of newer square-hub 40V mowers

The first Foifatt AC04029 20-Inch Lawn Mower Blade Compatible listing is built specifically for Ryobi’s updated 40-volt brushless architecture. Mowers within this family—including the PBLLM05, RY401170 (RY401017), and RY401180 (RY401018)—do not accept older AC04020 blades. Instead, they require the specialized AC04029 pattern, which incorporates a distinctive half-moon plus square center mounting cutout. This configuration locks onto the redesigned Ryobi motor arbor to prevent rotational play under heavy cutting resistance.

Constructed from hardened steel, this replacement blade resists impact deformation from hidden lawn debris and maintains structural integrity across dense grass conditions. Foifatt engineered the blade geometry to promote cleaner clipping discharge, helping prevent grass clumps from gathering under the deck dome. Note that the listing specifications cite dimensions of 16 by 2 by 0.1 inches with a 1.08-pound weight, so shoppers should double-check their mower’s physical deck clearance and existing blade profile before finalizing an order. This unit gives way to the AC04020 options if your mower utilizes round alignment pins.

• Directly replaces part number AC04029 on newer Ryobi 40V brushless mowers
• Features the mandatory half-moon and square center mounting hole interface
• Fabricated from hardened steel to provide reliable durability during routine turf maintenance
• Designed to reduce underside grass accumulation for smoother mulching and bagging flow

Best for
Heavy-duty mowing on classic three-hole decks

The Foifatt AC04020 20 Inch Lawn Mower Blade returns to the traditional AC04020 standard, serving machines like the RY40180, RY40190, and RY401110. Foifatt includes an explicit fitment warning on this model: it is engineered strictly for single-blade decks requiring a distinct three-hole mounting configuration. This arrangement consists of a small round alignment hole, a large round central mounting hole, and an opposed half-moon alignment hole. It will not mount to dual-blade CrossCut systems or square-arbor decks.

Weighing in at 2.1 pounds with listing dimensions of 18.5 by 2 by 0.1 inches, this replacement exhibits substantial heft that assists in carrying rotational inertia through thick patches of grass. The multi-functional blade profile efficiently chops clippings into fine mulch to return organic matter to the soil. Crucially, the listing states that this blade ships with an unfinished safety edge. Buyers must sharpen the bevel and balance the blade on a錐 cone balancer before mounting it to the mower, ensuring smooth operation without high-frequency motor vibration.

• Exact three-hole mounting configuration: small round hole, large center hole, and half-moon alignment hole
• Directly compatible with Ryobi RY40180, RY40190, and RY401110 single-blade mowers
• Substantial 2.1-pound high-quality steel construction offers strong cutting momentum
• Arrives with an unfinished safety edge requiring sharpening and balancing before initial use