Does your lawn look patchy, even after you’ve just mowed? A dull or wrong-sized blade can turn a simple chore into a frustrating battle against uneven grass. For many homeowners, the 21-inch mower is the workhorse of the yard, but choosing the perfect blade for it feels surprisingly complicated. You worry about fit, cutting quality, and how fast the blade will wear out.
Selecting the correct 21-inch lawn mower blade is crucial. The wrong blade tears the grass instead of slicing it cleanly, stressing your mower engine and leaving your lawn looking ragged. It’s a small part that makes a huge difference in your yard’s health and appearance. We understand this headache, and that’s why we’ve cut through the confusion.
Inside this guide, you will learn exactly how to match the best blade type—whether standard, mulching, or high-lift—to your specific machine and grass type. By the end, you will confidently choose a blade that delivers a professional, clean cut every single time. Let’s dive in and get your lawn looking its absolute best.
Top 21 Inch Lawn Mower Blade Recommendations
- 21 Inch Troy Bilt Mower Blade Replace number Troy Bilt MTD 942-0741A 942-0741 742-0741 742-0741A 742-04100 490-100-C089 742-04276 742-04276S 942-04276 942-04276S CC-742-0741 OEM-742-0741
- 942-0741A Mulching Blade Compatible with Troy-Bilt TB110 TB240 TB230 TB130 TB200 TB160 TB210 TB280ES TB320 TB115 TB220 TB360 TB105 TB120 TB125 TB130XP TB140 TB160XP TB270ES TB270XP TB290ES TB330 TB360ES TB370 21" Deck Walk Behind Push Mower
- BLADE SPECIFICATION: Length: 20 7/8″(531.5mm), Width: 2-1/4"(57mm), Thickness: 9/64"(3.4mm), Center Hole Shape: Bow Tie, For Deck Size: 21", Lift: 1-1/8"(28mm), Mower Blade Type: Mulching Blade.
- FIT TOUGH MOWING TASKS: The blade is very suitable for cutting overgrown weeds or clearing rugged terrain. You can sharpen the blade if you want to maintain a neat, even cut for normal lawns. The cutting edges are painted to prevent rust and protect your hands during installation. The paint will wear off as you mow the grass.
- 3-IN-1 BLADE: Serves 3 purposes (mulching, bagging, and side discharging) at the same time. Featuring numerous curves that cuts and re-cuts grass to smaller pieces, and recycles them back into the soil as nutrients to promote healthy lawn growth. Additionally, its high-lift increases the bagging capacity by 50%.
- Includes 1 mulching blade for many 21 in. cut MTD, Cub Cadet, Troy-Bilt, and Craftsman mowers. Must Match Current Blade OEM Number to insure exact fit.
- Replaces OEM #'s: 742-0741, 742-0741A ,742-04276, 742-04276S, 942-0641, 942-0741, 942-0741A 942-04276, 942-04276S, CC-742-0741; Craftsman CMXGZAM100067
- Fits Cub Cadet Models: CC Series- 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 Series- 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, and SC 700 H; S/SR/SRC/SRE Series: S 621, S 621 SS, SR 621, SRC 621, SRE 621, SC 621, SC 621 E; and other models- MTD 214 IP, 214 KW, and PR 521.
- Fits Troy-Bilt Models: 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.
- CENTER HOLE: Bow Tie Center Hole Pattern. Diameter of Outside Hole is 5/16". Center to Center of outside Hole is 2.5"
- Fits For Troy Bilt Tb110 Blade, Replace number Troy Bilt Cub Cade Craftsman MTD 942-0741A 942-0741 742-0741 742-0741A 742-04100 490-100-C089 742-04276 742-04276S 942-04276 942-04276S CC-742-0741 CMXGZAM100067 OEM-742-0741.
- Fits For Troy Bilt 21 Inch Mower Blade, Compatible with Troy-Bilt TB110 TB240 TB230 TB130 TB200 TB160 TB210 TB280ES TB320 TB115 TB220 TB360 TB105 TB120 TB125 TB130XP TB140 TB160XP TB270ES TB270XP TB290ES TB330 TB360ES TB370; Craftsman M250 M110 M230 M140 M210 M100 M260 M105 M270 M115 M320 M310 Lawn Mower.
- AVOID MISTAKES: This 942-0741A blade is ONLY compatible with a Bow Tie spindle. Please check that your center hole pattern matches before purchasing to avoid installation issues.
- BLADE SPECIFICATION: Length: 21"(533mm), Width: 2-1/4"(57mm), Thickness: 9/64"(3.4mm), Center Hole Shape: Bow Tie, For Deck Size: 21", Lift: 1-1/8"(28mm), Mower Blade Type: Mulching Blade.
- FIT TOUGH MOWING TASKS: The blade is very suitable for cutting overgrown weeds or clearing rugged terrain. You can sharpen the blade if you want to maintain a neat, even cut for normal lawns. The cutting edges are painted to prevent rust and protect your hands during installation. The paint will wear off as you mow the grass.
- Replaces OEM Part: MTD, Troy Bilt 942-0741A, 742-0741, 742-0741A, 742-04100, 942-0741, 942-04276S, 942-04276, 742-04276S, 742-04276, 01002810, 490-100-C089, 490-100-M084, 942-0641, CC-742-0741, OEM-742-0741, DXGX100084, Craftsman CMXGZAM100067
- Dimensions: Length 21", Width 2-1/4", Center Hole Bow-Tie, Side Hole 5/16", Center to Center Outside Hole 2-1/2", Air Lift 1-7/64", Cutting Edge Length 6-7/64", Compatible Deck Size 21". The length of the blade is measured diagonally from one end to the other
- Long-Term Durability: Made from premium, high-strength steel that keeps the cutting edge sharp and stable, ensuring long-lasting performance and extended blade life even under heavy use.
- 942-0741A Troy Bilt 21 Inch Mower Blades Compatible with TB100, TB105, TB105B, TB110, TB115, TB120, TB120B, TB125, TB125B, TB130, TB130XP, TB140, TB160, TB160XP, TB200, TB210, TB210B, TB220, TB220BXP, TB230, TB230XP, TB230BXP, TB240, TB240KXP, TB270ES, TB270XP, TB280ES, TB290ES, TB320, TB320XP, TB330, TB330XP, TB360, TB360XP, TB360ES, TB370, TB370XP. Please confirm the complete model number to ensure a proper fit. For a more detailed list of compatible models, check the description below
- 942-0741A Troy Bilt 21 Inch Mower Blades Compatible with TB380, TB380ES, TB380XP, TB400XP, TB430XP, TB450XP, TB490XP, TB449E, Tru-Cut 100, Tru-Cut 110, Tuff-Cut 200, Tuff-Cut 210, Tuff-Cut 220, Tuff-Cut 230, Pro-Cut 300, Pro-Cut 310, Pro-Cut 320, 12ALC35S766, 12ALC35S711, 12ALC35S066, 12AKD3AQ766, 12AKC35U711, 12AI869G211, 12AI869F066, 12AI869F011, 12AI832Q766, 12AI832Q711, 11A-54K3066, 11A-549C766, 11A-546N711, 11A-426A066, 12A-446A066, 11A-426A011, 11A-426A711, 11A-426C211, 11A-426C266
- Replaces OEM Part Numbers: AYP/Husqvarna/Poulan/Craftsman: 165833, 165833B, 175064, 189028, 406712, 176135, 159267, 008020, 175052, 406706, 406712X431, 531300765, 532 17 50-52, 532159267, 532165833, 532175064, 532176135, 532189028, 532406712, 539111878, 917175064, 917175064PB, 917176135, 917532165833, 917532175064, 917532176135, PP23020
- Compatible with: Husqvarna: 5521, 6021, 6521, 7021, 87521, W21SKC, W53SEK, XT721F Walk Behind Mowers with 21" Mower Decks; Poulan: PO550R, PP725N21RH, PR500N21SH, PR550, PR550H, PR675N21RH3, PR65Y21C Walk Behind Mowers with 21" Mower Decks; Craftsman: 917375940, 917375950, 917378494;
- Compatible with: AYP: PH65Y21RHP, PO500N21R, PO500N21RH, PO500N21RHX, PO500N21RH3, PR160N21CHC, PR160Y21RDP, PR160Y21RPC, PR173Y22RP, PR550N21R, PR550N21RH3, PR550N21RX, PR600N21RH, PR600N21RHC, PR600N21RHX, PR600Y21RDP, PR600Y21RHP, PR600Y21RHPX, PR600Y21RP, PR600Y21RPX
- High Quality: The Blades are made of high-grade steel, ensuring its durability and long-lasting use. The powder coating on the lawn mower blade prevents rust and makes cutting more efficient.
- Package Includes: 2 x Lawn Mower Blades. Blade Length: 21-1/16", Blade Width: 2-1/4", Thickness: 0.138", Center Hole: 5/8", Outer Hole 3/8". Deck Dize: 21". Please verify the center hole shape before your order.
- REPLACEMENT OEM: MTD/Cub Cadet 742-04100, 742-0741, 742-0741A, 942-0741, 942-0741A, 742-04276, 742-04276S, 942-04276, 942-04276S, CC-742-0741, 490-100-C089; Craftsman CMXGZAM100067
- COMPATIBLE WITH 21 INCH DECK MOWER: CUB CADET: CC469, CC989, CC997ES, PR521, S621, S621SS, SC621, SC621E, SR621, SRC621, SRE621, CC439, CC949, CC94M, CC98M, PR521, CC46M, CC46MZ, CC94M, CC999ES, SC 100 H, SC 100, SC 100 HW, SC 700 H, SC 700, CC46ES, CC99M, CC98, CC98H, CC98K, 5521, 214 IP, 214 KW
- 942-0741A MOWER BLADE SPECIFICATIONS: Length: 20-30/32"(531.5mm), Width: 2-3/16"(55mm), Thickness: 9/64"(3.5mm), Air lift: 26/32"(20mm), Center Hole Shape: Bow Tie, Blade Type: Mulching Blade
- 3-IN-1 MOWER BLADE: Supports mulching, bagging, and side-discharging modes.The advanced multi-curve design finely chops grass clippings into nutrient-rich mulch, promoting a healthier lawn. Meanwhile, the integrated high-lift wing optimizes airflow to significantly improve bagging efficiency for a cleaner cut and easier collection
- Precision Cutting Performance: Our blades are meticulously crafted from 40MnB steel and rigorously tested to ensure consistent, precise cutting. Designed for effortless operation, they deliver a smoother, more efficient mowing experience. The cutting edge features a rust-resistant coating that protects hands during installation; this coating wears off naturally during use
- Replaces OEM #: 108-0954-03, 116-4500, 1164500S, 1350413S
- Fits 21" cut Toro, Exmark and lawn Boy mowers
- Size: 20-27/32" x 2-1/4" with a 7/16" center hole
- Package contains 1 blade and Made in the USA
- To ensure a proper fit, please check your owner's manual to verify the proper replacement blade number and be sure that it matches one of the OEM numbers listed in our description. We make our best effort to ensure all replacement OEM numbers are detailed in our product description.
- REPLACEMENT OEM: MTD/Cub Cadet 742-04100, 742-0741, 742-0741A, 942-0741, 942-0741A, 742-04276, 742-04276S, 942-04276, 942-04276S, CC-742-0741, 490-100-C089; Craftsman CMXGZAM100067
- COMPATIBLE WITH 21 INCH DECK MOWER: Troy-Bilt Models: TB110, TB230, TB240, TB130, TB210, TB320, TB220, TB280ES, TB115, TB200, TB160.
- 942-0741A MOWER BLADE SPECIFICATIONS: Length: 20-30/32"(531.5mm), Width: 2-3/16"(55mm), Thickness: 9/64"(3.5mm), Air lift: 26/32"(20mm), Center Hole Shape: Bow Tie, Blade Type: Mulching Blade.
- 3-IN-1 MOWER BLADE: Supports mulching, bagging, and side-discharging modes.The advanced multi-curve design finely chops grass clippings into nutrient-rich mulch, promoting a healthier lawn. Meanwhile, the integrated high-lift wing optimizes airflow to significantly improve bagging efficiency for a cleaner cut and easier collection.
- Precision Cutting Performance: Our blades are meticulously crafted from 40MnB steel and rigorously tested to ensure consistent, precise cutting. Designed for effortless operation, they deliver a smoother, more efficient mowing experience. The cutting edge features a rust-resistant coating that protects hands during installation; this coating wears off naturally during use.
The Ultimate Buying Guide for Your 21-Inch Lawn Mower Blade
Choosing the right 21-inch lawn mower blade makes a huge difference in how your lawn looks. A good blade cuts cleanly. A dull or wrong blade tears the grass. This guide helps you pick the best one for your needs.
Key Features to Look For
When you shop for a new blade, look closely at these important parts:
1. Blade Type
- Standard/High-Lift Blades: These are common. They lift the grass up high before cutting. This creates a nice vacuum effect. They work well in normal conditions.
- Mulching Blades: These blades have curves or extra cutting edges. They chop the grass clippings into tiny pieces. These small pieces fall back into the lawn as natural fertilizer.
- Bagging Blades: These also lift the clippings well. They push the cut grass toward the discharge chute so you can bag it easily.
2. Center Hole Shape
The hole in the middle of the blade must match your mower’s spindle exactly. Mower spindles come in different shapes. Common shapes include Star, Bowtie, or Round. Measure or check your old blade carefully. A bad fit means the blade wobbles and won’t attach safely.
3. Overall Length
While you need a 21-inch blade, measure your old one just to be sure. Most 21-inch mowers use blades that are exactly 21 inches from tip to tip. Always confirm the exact measurement.
Important Materials and Quality Factors
The material of the blade affects how long it lasts and how sharp it stays.
1. Steel Quality
- High-Carbon Steel: Most good blades use this. It holds a sharp edge longer than softer metals. It resists bending when hitting small rocks or sticks.
- Thickness: Thicker blades generally last longer and resist warping. Check the gauge (thickness) if the seller lists it.
2. Coating and Finish
Some blades have special coatings (like paint or powder coating). These coatings help prevent rust when the blade sits unused during winter. Rust weakens the metal over time.
Factors That Improve or Reduce Quality
- Improved Quality: Blades made from heat-treated steel offer better toughness. Look for blades with balanced construction; this means they spin smoothly without vibration.
- Reduced Quality: Cheap, thin metal blades dull very fast. They might also bend easily if they strike a hard object. Poorly balanced blades cause your mower engine to shake, which can cause damage over time.
User Experience and Use Cases
Your yard conditions decide which blade you should buy.
For Thick, Tall Grass
If you often let your grass grow too long, you need a blade with high lift. A high-lift blade creates a strong airflow to stand the grass up before cutting. This prevents the mower from bogging down.
For Frequent Mowing (Lawn Health)
If you mow every week, a mulching blade works best. It keeps the clippings small. This feeds your lawn nutrients naturally. You will spend less time bagging clippings.
For Yards with Debris
If your lawn sometimes has small sticks or acorns, you need a tough, thick blade. A strong blade handles these hits better. Always stop the mower and check for debris before you start cutting.
10 Frequently Asked Questions (FAQ) About 21-Inch Mower Blades
Q: How often should I replace my 21-inch blade?
A: You should replace it at least once a year, or sooner if you notice ragged cuts. Sharpening is an option, but replacement offers better performance.
Q: Can I use a mulching blade if I want to bag my grass?
A: Yes, most mulching blades work fine for bagging too. They just chop the clippings a bit more before they exit the chute.
Q: What is “blade lift”?
A: Blade lift is how much air the blade moves. More lift means the grass stands up taller for a cleaner cut, especially in thick grass.
Q: Does the center hole shape really matter?
A: Yes, it is very important. If the hole does not match your mower spindle, the blade will not attach securely. This is dangerous.
Q: How do I know if my current blade is dull?
A: Look at the tips of your cut grass. If the tips look white, frayed, or brown the day after mowing, your blade is dull and needs attention.
Q: Is it safe to use a blade slightly longer than 21 inches?
A: No. Using a blade that is too long can cause it to hit the sides of the mower deck, which can cause serious damage or injury.
Q: What is the best time of year to buy a new blade?
A: Springtime is busy. Buying your spare blade in late winter lets you swap it out easily before the heavy cutting season starts.
Q: How do I safely remove the old blade?
A: Always disconnect the spark plug wire first for safety. Then, block the blade from spinning and use the correct wrench to loosen the center bolt.
Q: Are universal blades a good idea?
A: Universal blades fit many mowers. However, an OEM (Original Equipment Manufacturer) blade or a blade made specifically for your model usually offers the best fit and performance.
Q: What material is best for cutting wet grass?
A: Wet grass is tough on blades. A strong, high-carbon steel blade that is kept very sharp cuts wet grass better than a soft, dull one.