2 Pack Replacement Lawn Mower Blade Compatible with Ryobi RY40180, RY40190, RY401110, RY401120, RY40LM30 20 Inch 40V Brushless Mowers, Replaces AC04020 Review

Overview

If you own one of Ryobi’s popular 40V brushless 20-inch mowers (like the RY40180, RY40190, RY401110, RY401120, or RY40LM30), this 2-pack replacement blade set is the factory-style drop-in you’ll need when your original blades get dull or damaged. Designed to replace Ryobi part AC04020, these blades are built for homeowners who want a quick, no-modification swap to keep their battery mower cutting cleanly through the season.

Who Should Buy This

Homeowners with a Ryobi 40V 20-inch mower from the list above – If you already own one of these models, this is the no-brainer replacement. No measuring, no filing, no adapter plates. Just unbolt your old blade, bolt this one on, and go.

Owners who mow a standard suburban lawn (¼ acre or less) – These blades are optimized for the lighter-duty cutting you’ll do on a typical battery mower. They’re not for heavy brush or overgrown pastures, but for weekly maintenance cuts on fescue, bluegrass, or Bermuda, they’re perfectly matched.

Budget-conscious buyers who want a spare on hand – The 2-pack means you get a fresh blade now and a backup for next season (or for when you hit that hidden rock). At roughly $17.50 per blade, it’s cheaper than buying singles from the dealer.

DIYers who prefer OEM-equivalent parts – These are aftermarket blades that match the factory specs. If you want the exact same cutting performance and balance your mower came with, this set delivers that without the Ryobi-branded markup.

Key Features Breakdown

20-inch cutting width – This matches the deck size of your Ryobi mower exactly. A blade that’s too short leaves uncut strips; one too long can hit the deck or cause dangerous vibration. This is the right size.

Replaces AC04020 – That’s the OEM part number for Ryobi’s 20-inch 40V mowers. Cross-reference it before buying. This set is confirmed for RY40180, RY40190, RY401110, RY401120, and RY40LM30. If you have a different model, measure your blade first.

2-pack design – Practical for anyone who mows a lot. You can swap a fresh blade mid-season without ordering again, or keep one sharpened and one in reserve. The pack also makes it easy to replace both blades if your mower uses a twin-blade system (most Ryobi 40V 20-inch models use a single blade, but you’ll have a spare).

Steel construction with painted finish – Standard carbon steel with a black or silver coating. Nothing fancy, but adequate for residential grass. The coating helps resist rust between mows, though it will wear off at the cutting edge after a few uses.

Universal fit for Ryobi 40V brushless mowers – The center hole pattern and offset are designed to match the factory blade. No wobble, no need to rebalance. Just torque to the spec in your manual (usually 35-45 ft-lbs).

Pros

Drop-in fit with zero modification – No filing, no drilling, no adapter rings. It’s the exact same shape and hole pattern as the OEM blade. You can swap it in under 10 minutes with a socket wrench.

Cost-effective 2-pack – At $35 for two blades, you’re paying less per blade than a single Ryobi-branded replacement at most hardware stores. The savings are real.

Good for light- to medium-duty mowing – On standard turf, these cut cleanly and don’t leave ragged tips. They hold an edge reasonably well for a few mows before needing a touch-up.

Lightweight design – The blades are lighter than some heavy-duty aftermarket options, which means less strain on your mower’s electric motor and battery. That translates to slightly longer runtime per charge.

Works across multiple Ryobi models – If you own more than one compatible mower (or upgrade later), you can use the same blade. It’s a nice flexibility.

No balance issues out of the box – Most users report these are well-balanced from the factory. No need to spend time on a balancer unless you hit something hard.

Cons

Not for tough or wet grass – These blades dull faster than premium high-lift or mulching blades. If you regularly mow thick, damp St. Augustine or let your grass get tall, you’ll lose cutting efficiency quickly.

Coating wears off fast – The paint or powder coating chips off after a few mows, especially near the cutting edge. It doesn’t affect performance, but the blade will look rusty after a season.

No mulching or bagging optimization – These are standard lift blades. If you want a dedicated mulching blade (with more curve and a serrated edge) or a high-lift bagging blade, this isn’t it. They’re a solid all-rounder but not specialized.

Inconsistent quality control – With a 3.5-star average and 53 reviews, there are a handful of reports about blades arriving slightly bent or with off-center holes. Inspect yours immediately—if it’s defective, return it. Most are fine, but it’s not perfect.

Bottom Line

This 2-pack replacement blade set is a practical, cost-effective choice for anyone who owns a compatible Ryobi 40V 20-inch mower and wants a simple, factory-style swap. It’s not a performance upgrade—it’s a reliable, drop-in replacement that keeps your mower cutting like new. If you’re mowing a standard lawn and don’t need specialized mulching or high-lift blades, this is the best value you’ll find. I recommend buying a set to have a spare on hand, but inspect each blade before installation and be prepared to sharpen them more often than premium options. For the price, it’s hard to beat.

Frequently Asked Questions

Will these blades fit my Ryobi RY40180?
Yes. This set is specifically designed for the RY40180, RY40190, RY401110, RY401120, and RY40LM30. All use the same AC04020 blade pattern. If you have a different model, remove your blade and measure the center hole diameter (should be 1 inch) and overall length (20 inches) to confirm compatibility.

Do I need to balance these blades before installing?
Most come well-balanced from the factory, but it’s good practice to check. Place the blade on a cone balancer or a nail hammered into a board. If one side dips, file the heavy side slightly. It’s rare with these, but worth the 30-second check for a vibration-free mow.

How often should I replace these blades?
For a typical ¼-acre lawn m