4 Best Double Sided Lawn Mower Blades for a Sharper Cut

A blade that’s dull on both sides is a frustrating problem. You stop mid-mow, flip the deck, and realize you don’t have a spare. Double sided lawn mower blades solve that by giving you a second cutting edge before you need to sharpen or replace them.

The trick is finding blades that fit your specific mower deck and match how you cut. Some prioritize lift for bagging, others focus on mulching fine clippings. The four picks here cover different brands and deck sizes, from commercial zero-turns to compact electric mowers.

I focused on build quality, compatibility, and real-world cutting behavior. You’ll find a clear winner for most homeowners, a specialized option for commercial decks, and a budget-friendly choice for Greenworks owners. There’s also a sharpening tool that pairs well with any of them.

Here’s a quick look at how the four products compare on the specs that matter most.

Features	KOLTRUNEX High Lift	8TEN LawnRAZOR	Greenworks Replacement	SHARPAL 121N
Material & Build	High quality steel, black coating	Steel, 0.203 inch thick	One-piece forged steel	Monocrystalline diamond, stainless tang
Key Specification	Fits 42 inch Bad Boy decks	21 inch length, 5/8 inch center hole	15.75 inch length	Dual grit: 325 and 1200
Main Feature	Double-sided cutting edges	Toothed design for tough grass	Precise fit for 16 inch mowers	Sharpens dry, no oil needed
Performance	High lift for efficient discharge	High lift, aggressive cutting	Clean, even trim	Quick edge setting and honing
Best Use Case	Bad Boy MZ 42 inch owners	Commercial 61 inch mower decks	Greenworks 25322 and 25242	Maintaining any mower blade

KOLTRUNEX High Lift Mower Blades

KOLTRUNEX makes a set of double sided blades built specifically for Bad Boy MZ zero-turn mowers with 42 inch decks. If you own one of the compatible models from 2026 through 2026, these bolt on without modification. The double sided design means you get two cutting edges per blade, which effectively doubles the time between sharpening sessions.

The high lift geometry stands out here. It generates strong airflow under the deck, which helps discharge clippings out the chute rather than letting them clump underneath. That makes a noticeable difference in thick, damp grass where standard blades tend to leave windrows. The black coating on the surface is a factory treatment that wears off over time, but it doesn’t affect cutting performance one bit.

One thing to keep in mind is the compatibility list. This is not a universal blade. It fits the specific Bad Boy MZ and Maverick HD models listed, so you need to verify your deck assembly year before ordering. The blades come sharpened from the factory, but you’ll still want to check balance before installation.

• Fits Bad Boy MZ 42 inch decks from 2026 to 2026 models
• Double sided cutting edges extend useful life between sharpenings
• High lift profile improves grass discharge and reduces clumping
• Made from hardened steel with a protective black coating
• Sold as a set for a complete deck replacement

Best for: Bad Boy MZ owners who want a drop-in double sided upgrade with strong discharge performance.

8TEN LawnRAZOR Mower Blades

The 8TEN LawnRAZOR is a serious piece of equipment for commercial mowers. This 3-pack of toothed blades fits a wide range of 61 inch decks from Scag, Ferris, Hustler, Wright, and several other major brands. The toothed edge gives it extra bite when cutting through thick or overgrown grass that would dull a straight edge quickly.

Each blade measures 21 inches long with a 5/8 inch center hole and a thickness of 0.203 inches. That’s a substantial blade built for heavy-duty use. The aggressive tooth pattern chews through grass and helps pull it up for a cleaner cut, which is particularly useful on walk-behinds and standers where deck vacuum is critical. The set also includes a sharpening stone and a balancer, which is a nice touch for maintaining your investment.

The trade-off is that this blade is not for everyone. It’s designed for large 61 inch commercial decks, so it won’t fit residential 42 or 46 inch mowers. The aggressive toothed design also tends to be louder than standard blades, and it may not produce the finest mulch for homeowners who prefer that look. But for its intended audience, this is a workhorse option.

• Fits 61 inch decks on Scag, Ferris, Hustler, Wright, and more
• Toothed cutting edge handles thick and overgrown grass
• Includes sharpening stone and blade balancer in the pack
• Thick 0.203 inch steel resists bending on rough terrain
• Compatible with a long list of OEM part numbers across brands

Best for: Commercial operators with 61 inch mowers who need durable, aggressive blades that can handle tough conditions.

Greenworks Replacement Lawn Mower Blade

Greenworks owners with a 16 inch corded mower, specifically models 25322 and 25242, have a straightforward replacement option here. This blade is forged from a single piece of steel, which gives it solid durability for a small electric mower. The 15.75 inch length matches the original spec precisely, so you won’t have to deal with fitment guesswork.

What’s notable about this blade is its simplicity. It’s a standard lift design that works well for regular weekly mowing on a small lawn. The single-piece steel construction means there are no welds or weak points that could fail under stress. For a corded mower that runs at a consistent speed, this blade delivers a clean, even cut without bogging down.

The limitation here is that it’s a single blade, not a set. You’ll need to order one for a single-blade mower, which is correct for these Greenworks models. It does not feature a double sided design, so it’s a standard replacement rather than an upgrade. But if you need a reliable OEM-style blade for your Greenworks, this gets the job done.

• Fits Greenworks 16 inch corded mowers, models 25322 and 25242
• One-piece forged steel construction resists bending and breaking
• Measures 15.75 inches for a precise factory fit
• Engineered for efficient cutting on small to medium lawns
• Simple bolt-on installation with basic hand tools

Best for: Greenworks 16 inch mower owners who want a durable, correctly sized replacement blade without hunting for universal fits.

SHARPAL 121N Dual-Grit Sharpening Stone

Sharpening is part of owning any mower, and the SHARPAL 121N makes that job easier. This is a dual-grit diamond sharpening stone with a coarse 325 grit side for setting a new edge and an extra fine 1200 grit side for honing. It’s designed for garden tools, including mower blades, and it works dry so you don’t need oil or water.

The diamond coating is monocrystalline, which means it’s extremely hard and cuts fast. The full tang stainless steel body gives you a solid grip, and the ergonomic handle has 20 degree angle guides on both sides. Those guides help you maintain a consistent angle while you file, which is the difference between a sharp edge and a mediocre one. It’s a compact tool that stores easily in a toolbox or garage drawer.

This stone won’t replace a bench grinder for badly nicked blades, and it takes some elbow grease to sharpen a full set of three commercial blades. But for regular maintenance on a home mower, it’s quick and effective. The 3 year warranty from SHARPAL, a California-based company, adds peace of mind.

• Coarse 325 grit for fast edge setting, fine 1200 grit for honing
• Diamond coating sharpens dry without messy oil
• 20 degree angle guides on both sides for consistent results
• Full tang stainless steel handle is comfortable and durable
• Backed by a 3 year warranty from a US-based company

Best for: Homeowners who want a simple, no-mess way to keep their mower blades sharp and extend the time between replacements.

How We Chose These Products

I started by looking at what actually matters when you’re shopping for mower blades. Compatibility is the first filter, because a blade that doesn’t fit your deck is useless no matter how well it’s made. I verified each product’s fitment claims against the models and part numbers provided, and prioritized blades with clear, specific compatibility lists over vague universal claims.

Build quality came next. The steel thickness, the construction method, and the cutting edge design all affect how long a blade lasts and how clean a cut it delivers. I also weighed the real-world use case for each product. A commercial 61 inch deck has different needs than a residential 16 inch electric mower, so I made sure the picks matched their intended audience. The sharpening stone earned a spot because maintaining a double sided blade is part of getting value from it.

Buying Guide: What Really Matters

Deck compatibility is the non-negotiable factor. Check your mower’s model number and deck size, then cross-reference it with the blade’s OEM part numbers. A blade that’s half an inch too long can hit the deck housing, and one with the wrong center hole won’t mount securely. The provided data for each product lists specific compatible models, so use that as your starting point.

Blade design affects how your mower handles clippings. High lift blades create more airflow, which is great for bagging and discharging, but they require more engine power. Standard or low lift blades are better for mulching and for mowers with smaller engines. Toothed edges cut through thick grass more aggressively but can be louder. Consider what you do most often with your mower before choosing a blade profile.

Double sided blades give you a second cutting edge, but only if you flip them before the first edge is completely destroyed. When you flip a blade, the second edge is already used on the opposite side, so you’re not getting a fresh edge. The real benefit is convenience and cost-per-use, since you sharpen less frequently. Always balance a blade after sharpening or flipping to avoid vibration that can damage your spindle.

Our Top Recommendation

The KOLTRUNEX High Lift Mower Blades take the top spot for most homeowners with a Bad Boy MZ 42 inch mower. The double sided design gives you two edges per blade, and the high lift profile keeps clippings moving out of the deck. It’s a practical upgrade that fits a wide range of model years, and the steel construction handles regular use without premature wear.

If you run a commercial 61 inch mower, the 8TEN LawnRAZOR 3-pack is the better choice. The toothed edge and thick steel are built for demanding conditions, and the included sharpening stone and balancer make maintenance easier. For Greenworks corded mower owners, the Greenworks Replacement blade is the straightforward, correctly sized option. And the SHARPAL 121N is a smart addition to any toolbox for keeping whatever blade you choose in good shape.

Frequently Asked Questions

Can I flip a double sided blade to use the other edge? Yes, that’s the point of the design. When one edge dulls, you can flip the blade to expose the second cutting edge. Just make sure you balance the blade after flipping, since wear patterns can make one side heavier.

How often should I sharpen a double sided blade? It depends on your lawn conditions and how often you mow. A typical home lawn might need sharpening every 20 to 25 hours of use. If you cut sandy soil or hit the occasional rock, you’ll need to sharpen more frequently. The SHARPAL stone is a good tool for this job.

Will a high lift blade work on my mulching mower? High lift blades are designed for discharge and bagging, not mulching. They create strong airflow that throws clippings out the chute. For mulching, you generally want a blade with more surface area and a different angle to recirculate clippings. Check your mower’s deck design before switching blade types.

What torque should I use when installing mower blades? Most manufacturers recommend tightening the center bolt to between 70 and 90 foot-pounds, but you should check your mower’s manual for the exact spec. Always disconnect the spark plug wire before working under the deck. Use a torque wrench to avoid over-tightening, which can strip the bolt or damage the spindle.