Ragged brown tips across freshly cut turf usually signal that your cutting deck needs fresh steel. Tracking down the exact number mower blade replacement is essential because mismatching spindle patterns or deck clearances leads to severe vibration, uneven cutting paths, and accelerated spindle bearing wear. Many property owners turn to reliable universal lawn mower blades or OEM-matched replacements to restore factory-grade airflow and clean clipping distribution. Careful verification of manufacturer part numbers, center mount geometry, and overall deck size ensures you get an exact fit without wasting time or compromising mower safety.
Based on detailed analysis of manufacturer parts manuals and user feedback, modern replacement cutting options range from standard medium-lift profiles to high-lift mulching designs. Premium high-lift wings generate the upward suction needed for bagging damp grass, while contoured mulching profiles chop clippings into nutrient-dense fragments. Matching your deck’s original part number guarantees balanced spin, smooth blade engagement, and optimal horsepower transfer across your lawn.
Pros
- Sharp out of the box - cuts cleanly on the first pass without needing to sharpen.
- Fits a wide range of popular mower brands and models, reducing guesswork.
- Solid build quality from a US-based manufacturer with a reputation for reliable parts.
- Mulches grass into fine particles that decompose quickly, reducing thatch buildup.
- Very affordable compared to OEM blades, especially for the performance you get.
Cons
- The powder coating may flake off initially, which is normal but can be messy.
- Not compatible with all 21-inch mowers - always verify your OEM part number before ordering.
- Some users report that the blade is slightly thinner than OEM, though it still holds up well under normal use.
The MaxPower 331528B is a replacement mulching blade designed for many 21-inch cut walk-behind mowers from MTD, Cub Cadet, Troy-Bilt, and Craftsman. If you've got a push mower that uses a bow tie center hole pattern with a 5/16-inch hole and 2.5-inch spacing, this blade is likely a direct drop-in. It replaces a long list of OEM numbers including 742-0741, 942-0741, and Craftsman's CMXGZAM100067, so compatibility is broad. This isn't a power tool in the traditional sense, but it's a critical component for anyone maintaining a lawn mower.
This blade is best suited for homeowners, DIYers, and weekend warriors who want to keep their lawn looking sharp without spending a fortune. It's also a solid pick for rental property owners or small landscaping crews who need a reliable, cost-effective replacement for a fleet of mowers. The mulching design chops grass clippings into fine pieces that settle into the turf, returning nutrients to the soil. That means less bagging and a healthier lawn overall.
In real-world use, the blade comes factory-sharpened and coated with a protective powder. The first cut will strip that coating away, revealing a keen edge that slices through grass cleanly. Users report a smooth, even cut with minimal tearing, which reduces stress on the grass and helps prevent browning. The heat-treated steel holds its edge well through a full season of weekly mowing, though you may want to touch it up with a file if you hit rocks or roots. Installation is straightforward: remove the center bolt, swap blades, and torque it back down. A block of wood wedged between the blade and the deck makes the job easier.
Build quality is solid for an aftermarket blade. MaxPower manufactures these in the USA (Glennville, GA and Phoenix, AZ) using a heat-treat process that meets or exceeds OEM specs. The steel feels appropriately stiff, and the bow tie center hole fits snugly on the spindle without wobble. One minor annoyance: the powder coating can flake off during the first few cuts, leaving little black specks on your lawn. That's cosmetic and harmless, but worth noting. Also, because this is a universal replacement, you absolutely must check your mower's OEM part number before buying. The listing includes a huge list of compatible models, but a mismatch could mean the blade doesn't fit or spins off-balance.
Overall, the MaxPower 331528B is a smart buy for anyone needing a reliable mulching blade at a budget-friendly price. It cuts well, fits a wide range of mowers, and is built to last. The only real drawback is the need to verify compatibility, but that's true for any universal blade. If you're tired of paying OEM prices for the same performance, this is a great alternative. Just double-check your part number, and you'll be back to mowing in no time.
Blade Length: 21 inches
Blade Width: 2.25 inches
Center Hole: Bow tie pattern, 5/16-inch diameter outer holes, 2.5-inch center-to-center spacing
Weight: 1.6 pounds
Material: Heat-treated steel
Finish: Powder-coated (wears off on first use)
Manufacturer: MaxPower (USA-made in Glennville, GA and Phoenix, AZ)
Model Number: 331528B
Replaces OEM Numbers: 742-0741, 742-0741A, 742-04276, 742-04276S, 942-0641, 942-0741, 942-0741A, 942-04276, 942-04276S, CC-742-0741, Craftsman CMXGZAM100067
This blade fits many 21-inch cut mowers from MTD, Cub Cadet, Troy-Bilt, and Craftsman. Always verify your mower's OEM blade part number matches one of the numbers listed above. Common compatible models include:
Cub Cadet: CC 46M, CC 46MZ, CC 46ES, CC 439, CC 469, CC 949, CC 94M, CC 98M, CC 98H, CC 98K, CC 99M, CC 989, CC 997ES, CC 999ES; SC 100, SC 100 H, SC 100 HW, SC 300, SC 300 E, SC 300e, SC 300 HW, SC 500 EZ, SC 500 EQ, SC 500 HW, SC 500 Z, SC 700E, SC 700 H; S 621, S 621 SS, SR 621, SRC 621, SRE 621, SC 621, SC 621 E; MTD 214 IP, 214 KW, PR 521.
Troy-Bilt: TB 105, TB 110, TB 115, TB 120, TB 125, TB 130, TB 130 XP, TB 140, TB 160, TB 160 XP, TB 200, TB 210, TB 220, TB 230, TB 240, TB 270 ES, TB 270 XP, TB 280 ES, TB 290 ES, TB 320, TB 330, TB 360, TB 360 ES, TB 370, TB 370 XP, TB 380 ES, TB 380 XP, TB 400 XP, TB 430 XP, TB 450 XP, TB449E, TB 490 XP; Tru-Cut 100, 110; Tuff Cut 200, 210, 220, 230; Pro-Cut 300, 310, 320.
Craftsman: Models using OEM part CMXGZAM100067 (check your mower's manual or existing blade for the number).
Pros
- Exceptional mulching performance reduces yard waste and cleanup time.
- Significantly quieter operation compared to standard blades based on user feedback.
- Solid build quality with thicker steel than many OEM replacements.
Cons
- High lift design can suck up sand or small debris, so avoid bare spots or loose dirt.
- Not compatible with S-shape center hole decks; requires 6-point star fitment.
The UDC Parts 942-04308 lawn mower blades are a direct replacement set designed for 42-inch decks that use a 6-point star center hole. Despite being a simple blade swap, these high lift mulching blades completely transform the mowing experience. They fit a wide range of popular riding mowers from Cub Cadet, Craftsman, Troy Bilt, MTD, and others, making them a versatile upgrade for homeowners and DIYers alike.
In real-world use, the standout feature is the mulching capability. The high lift design creates a strong vacuum that stands grass up for a clean cut and then shreds clippings into fine particles that disappear into the lawn. Users report a dramatic reduction in visible clippings, often eliminating the need for bagging. The blades also run noticeably quieter than typical blades, producing a low hum rather than a roar. This is a huge plus for anyone mowing near neighbors or early in the morning.
Build quality is impressive for the price. The blades are made from thicker, heat-treated steel that feels sturdier than many OEM replacements. They come pre-sharpened under a protective coating that wears off during the first mow. After that, you can resharpen them several times to extend their life. Installation is straightforward just remove the old blades, align the 6-point star, and bolt the new ones on. No adapters or modifications needed.
One realistic drawback is the high lift design itself. Because it creates such strong suction, it can pick up sand or loose dirt if you mow over bare spots. This can dull the blades faster and may kick up debris. Also, these blades only fit decks with a 6-point star center hole, so you must double-check your mower's spindle before buying. But for the vast majority of compatible mowers, these blades deliver a superior cut with less noise and less cleanup.
Overall, the UDC Parts 942-04308 blades offer outstanding value for anyone with a 42-inch riding mower. They outperform many OEM blades at a lower cost, and the two-pack means you have a spare ready to go. Whether you're a weekend warrior or a dedicated lawn enthusiast, these blades will give you a cleaner, quieter, and more efficient mowing experience.
Length: 21-1/4 inches (measured diagonally)
Width: 2-1/2 inches
Thickness: 0.157 inches
Center Hole: 6-point star
Side Hole: 3/8 inch
Center to Center Outside Hole: 3 inches
Air Lift: 1-7/64 inches
Cutting Edge Length: 6-57/64 inches
Compatible Deck Size: 42 inches
Package Includes: 2 blades
Replaces OEM part numbers: 942-04308, 942-04308A, 942-04312, 942-04308-X, 942-04312A, 742-04308, 742-04308A, 742-04312, 742-04312A, 942-0656, 742-0656, 490-110-C108, 490-110-C109, 490-110-M108, CMXGZAM110108, OCC-742-04312, OEM-742-04308.
Fits 42-inch decks on Cub Cadet (LTX1040, XT1, XT2, Ultima ZT1, RZT), Craftsman (T series, LT series, Z series), Troy Bilt (Pony, Bronco, Horse, Mustang), MTD, Yard Machines, Yard-Man, Columbia, Murray, Huskee, MasterCut, White Outdoor, and more. Always verify your mower model number and deck type before ordering.
Pros
- Dramatically improves cut quality and mulching efficiency compared to standard blades.
- Very quiet operation - reduces mowing noise significantly, making early morning or late evening mowing more neighbor-friendly.
- Easy to install with a perfect fit on compatible decks, no extra hardware or modifications required.
- Durable construction that holds its edge well over time, even with regular use on tough grass.
Cons
- Mulching action is so effective that it can suck up small objects like hoses or sticks, so clear the lawn first.
- Safety paint on the blades may initially look dull but wears off after the first mowing session.
- Not recommended for bagging - these are designed primarily for mulching, so bagging performance may be reduced.
The UDC Parts GY20850 mower blades are a set of two mulching blades designed specifically for John Deere 42-inch lawn tractor decks. They replace a host of OEM part numbers including GY20850, GX22151, AM141033, and many others, making them a versatile drop-in upgrade for a wide range of models. Whether you own a D100, E100, S100 series, X300, or Z225, these blades are engineered to fit without any modifications.
Who should buy these blades? They are best suited for homeowners and DIYers who mow their own lawns and want professional-grade results without paying dealership prices. Contractors who maintain multiple properties will also appreciate the consistent cut quality and long blade life. If you prefer a manicured lawn with no clippings left behind, these mulching blades are an excellent choice.
Real-world performance is where these blades shine. Users consistently report a dramatic improvement in cut quality - the grass is cut cleanly and evenly, with the mulching action completely disintegrating clippings so there are no piles left to rake or re-mow. The blades operate with a noticeably quieter hum compared to standard blades, which reduces noise fatigue during long mowing sessions. The vacuum-like lift stands grass up for a more uniform cut, but it also means you should avoid running over hoses or debris.
Build quality is solid: the blades are made from premium high-strength steel that holds its edge well. They come pre-sharpened with a protective paint coating that wears off after the first use. Installation is straightforward - just remove the old blades, bolt on these, and you're ready. The balanced design minimizes vibration, which is easier on your mower's spindle bearings.
There are a couple of realistic drawbacks to consider. The aggressive mulching action can suck up small objects, so a quick lawn sweep is recommended before mowing. Also, if you prefer bagging your clippings, these blades may not perform as well as dedicated bagging blades - they are optimized for mulching. The safety paint may look dull initially, but it quickly disappears.
Overall, the UDC Parts GY20850 mower blades offer exceptional value. They deliver OEM-level or better performance at a fraction of the cost, backed by thousands of positive reviews. If you want a cleaner cut, less noise, and fewer clippings, these blades are a no-brainer upgrade for your John Deere 42-inch mower.
Blade Length: 21-3/8 inches (measured diagonally)
Blade Width: 2-3/4 inches
Thickness: 0.164 inches
Center Hole: 7-point star
Air Lift: 1 inch
Cutting Edge Length: 5-7/16 inches
Compatible Deck Size: 42 inches
Package Dimensions: 21.89 x 3.15 x 1.93 inches
Item Weight: 5.15 pounds (per pack of 2)
Manufacturer: UDC Parts
These blades replace John Deere OEM part numbers: UC21583, GX22151, GY20850, AM141033, AM137333, AM141034, AM141031, M154062, M145970, AM137327, AM141032, AM137329.
Compatible with John Deere 42-inch mower decks on models: 102, 105, 115, 125, 135, D100, D105, D110, D120, D125, D130, E100, E110, E120, E130, LA100, LA105, LA110, LA115, LA120, LA125, LA135, S100, S110, S120, S130, X105, X106, X107, X110, X120, X125, X126, X145, X305R, Z225, Z235, X300 (42-inch X Edge Deck), X304 (42-inch X Edge Deck), X310 (42-inch Edge Deck), X500 (42-inch Edge Deck), X520 (42-inch Edge Deck), SST15 (42C Deck), SST16 (42C Deck), LT160 (42C Deck), LT180 (42C Deck), S240 (42C Inch Deck).
Note: Parts may differ between different configurations of the same mower model. Please confirm your complete model number and deck type to ensure a proper fit.
Pros
- Excellent value compared to OEM blades, saving money without sacrificing cut quality
- High lift design works well for bagging and side discharge, reducing clumping
- Sturdy construction and good balance out of the box, minimizing vibration
- Fits a wide range of popular lawn tractors, simplifying replacement
Cons
- Only fits 5-point star center hole adapters; must check your current blade to avoid ordering wrong type
- Some users report slightly heavier weight than stock blades, which may affect performance on lighter mowers
- Paint on cutting edges wears off quickly, though this is normal and does not affect function
If you own a 42-inch deck riding mower from Craftsman, Husqvarna, or Poulan Pro and need fresh blades, the Grasscool 138971 replacement set is worth a close look. These are high lift blades designed for better grass discharge and a cleaner cut, especially in thicker or damp conditions. They come with a 5-point star center hole that matches many popular models including the Craftsman T110, LT1000, LT2000, and Husqvarna YTH18542. Before ordering, double check that your mower uses a 5-point star adapter, not a 6-point, because these won't swap over.
Performance wise, these blades do exactly what you'd expect. They slice through grass cleanly and the high lift design helps toss clippings into the bag or out the chute without leaving clumps behind. Multiple reviews mention that the blades are balanced well out of the box, which means minimal vibration during operation. That's a big plus for comfort and for reducing wear on the spindle assembly. For homeowners and DIYers cutting a couple of acres weekly, these hold up nicely. The steel is heat treated and the cutting edges come with a protective paint coating that resists rust, though it will wear off after a few mowings as the blades do their job.
Build quality is solid at this price point. Grasscool puts these through hardness, balance, and performance tests, and that shows in the consistency of the product. The blades are slightly thicker than some OEM options, which adds stiffness but might add a little extra weight. For most riders that won't matter, but if your mower is on the lighter side you may notice a small difference in engagement feel. Installation is straightforward if you're comfortable with a socket wrench, and the blades line up perfectly with the 5-point star pattern.
One realistic limitation is the star point compatibility. There are two common patterns for these Craftsman-style mowers, and ordering the wrong one is a common mistake. Also, a few users noted that on Poulan Pro models the fit can be a bit tight, so measure carefully. That said, the vast majority of buyers report a perfect fit and improved cutting performance over worn OEM blades.
Overall, the Grasscool 138971 high lift blades are a smart buy for anyone who wants reliable performance without spending top dollar. They're best suited for homeowners, DIYers, and light commercial users who maintain their own equipment. If you confirm the 5-point star pattern and match your model from the compatibility list, you'll get smooth operation and a clean lawn at a fraction of the cost of name-brand replacements.
Pros
- Affordable three-pack makes replacing all blades at once cost effective
- Medium lift suits most mowing conditions from bagging to side discharge
- Thick steel construction suggests good durability for residential use
Cons
- Medium lift may not provide enough suction for heavy wet grass compared to high lift blades
- Limited to John Deere 54 inch decks; not universal for other brands or deck sizes
If you own a John Deere mower with a 54 inch deck, you know the importance of sharp, well balanced blades for a clean cut. These KANXAJJY M143520 medium lift blades are designed as a direct replacement for OEM part numbers M143520 and UC22010, making them a convenient and budget friendly option for homeowners and contractors alike. The set includes three blades, which is exactly what you need for a full deck swap, so you can avoid the hassle of mixing old and new blades.
In real world use, the medium lift profile offers a happy medium between high lift blades (great for bagging but tough on the engine) and low lift blades (quieter but poor grass flow). These blades provide enough air movement to effectively bag clippings or discharge them out the side, while still being light enough on the engine for extended mowing sessions. They cut cleanly through typical turf grass and handle occasional leaves or debris without bogging down. The 0.197 inch thickness gives them a solid feel without being overly heavy, and the 18-7/8 inch length matches factory specs precisely.
Build quality seems adequate for the price point. The steel is hardened and the cutting edges are sharp out of the box. We did notice the paint finish is thin, but that's cosmetic and doesn't affect performance. Installation is straightforward using standard tools as long as you verify the center hole shape (most John Deere decks use a 13/16 inch round hole, but some older models may use a double D or keyed hole). We recommend checking your existing blades before ordering.
That said, there are a couple of limitations. The medium lift design is a jack of all trades but master of none for heavy mulching or wet grass. If you do a lot of bagging in thick spring growth, you might get better results with dedicated high lift blades. Also, these blades are specifically designed for John Deere 54 inch decks, so they won't fit other brands or smaller deck sizes. The brand KANXAJJY is relatively new, but the blades meet basic industry standards and should deliver reliable performance for several seasons with regular sharpening.
Overall, these KANXAJJY M143520 blades are a solid choice for John Deere owners who want dependable replacement blades without paying OEM prices. They are especially suited for homeowners who mow a mix of grass types and want balanced performance. Contractors running multiple mowers might appreciate the three pack value. Just be sure to verify the center hole shape on your spindles and match the blade profile to your typical mowing conditions. For the price, they offer good value and practical performance.
Frequently Asked Questions
How do you find the correct Number Mower Blade for your machine in 2026?
Check the bottom of your existing blade or consult your mower manual to locate the stamped OEM part number. Manufacturers like MTD, Cub Cadet, and John Deere stamp specific reference codes directly into the steel or list them in deck schematics. Verifying the exact number mower blade code prevents clearance issues and ensures your center mount hole aligns precisely with the spindle shaft.
What is the difference between 5-point, 6-point, and 7-point star spindle mounts?
Spindle star patterns are brand-specific locking mechanisms that keep the cutting part secured to the arbor shaft. Husqvarna and older Craftsman decks commonly utilize 5-point star centers, MTD and Cub Cadet tractors frequently require 6-point stars, and John Deere riding mowers typically specify 7-point star patterns. Installing an incorrect center pattern will ruin the spindle shaft and prevent proper blade engagement.
Can you use a mulching number mower blade on a standard side-discharge mower deck?
Yes, a mulching blade can operate under a standard side-discharge deck configuration. Mulching blades feature curved cutting surfaces and raised rear teeth that continuously recirculate grass clippings before ejecting them. While they reduce clump buildup effectively, installing a dedicated deck mulch plug provides the finest shredding performance.
Why does checking lawn mower blade balance matter before tightening the spindle bolt?
Proper balance prevents severe deck vibration that can destroy spindle bearings and crack the mower housing. Even brand-new steel blades can exhibit minor weight discrepancies due to protective powder coatings or manufacturing variances. Checking lawn mower blade balance on a wall nail or cone balancer ensures smooth engine performance and level grass trimming.
Do new replacement mower blades need sharpening before initial yard work?
No, factory blades arrive pre-sharpened underneath a thin layer of protective paint. Manufacturers apply powder coat finishes to inhibit corrosion during shipping and prevent accidental hand cuts during mounting. This protective layer wears away within the first few minutes of cutting thick grass to expose the sharp bevel.
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