7 Best Craftsman 21 Lawn Mower Blade Replacements to Buy in 2025

Delivering an uncompromising factory-spec fit, the CRAFTSMAN CMZMW21 blade is the definitive choice for brand loyalists seeking pristine performance. This isn’t just a replacement part; it’s a restoration of your mower’s original cutting capability, engineered to the exact specifications of your machine. For anyone frustrated with ill-fitting aftermarket parts, this blade eliminates guesswork and ensures a perfectly balanced, clean cut that promotes a healthier, greener lawn.

In real-world testing, the blade’s performance is immediately noticeable, providing a sharp, even cut across various grass types without tearing the blades. Its durable steel construction holds an edge well through several mows, handling typical residential lawn debris with ease. The 21-inch cutting path is precisely maintained, and its aerodynamic lift is optimized for efficient bagging and mulching, preventing clumps and ensuring a manicured finish every time you mow.

While aftermarket options like the budrash 942-0741A offer a two-pack, the CRAFTSMAN CMZMW21 is tailored for the owner who prioritizes quality and a guaranteed fit over sheer quantity. It’s the ideal craftsman 21 lawn mower blade replacement for those who refuse to compromise on the integrity and performance of their equipment. The assurance of an official part provides a level of quality and longevity that many value-focused alternatives simply can’t match.

Precision-engineered for exceptional mulching performance, the MTD Genuine Parts 942-0741A blade is a powerhouse for those who prefer to nourish their lawn with fine clippings. Its unique curved design creates a powerful vortex under the deck, recutting grass into minuscule particles that decompose quickly. This blade is the solution for homeowners battling clumpy discharge or uneven mulching, offering a factory-quality upgrade for a wide range of MTD-family brands, including many Craftsman models.

On the turf, this blade truly shines when tackling dense or slightly damp grass, where lesser blades might bog down or leave trails. The star-shaped center hole provides a secure, slip-free mount on compatible spindles, ensuring consistent power transfer and a smooth, vibration-free operation across its 21-inch path. Its robust build quality suggests it can handle the rigors of a full mowing season without a significant drop in performance.

Compared to a universal option like the Stens 300-121RT-STN, the MTD blade offers the peace of mind of an OEM-level part designed for a specific family of mowers, ensuring optimal aerodynamics and fit without adapters. For owners of compatible Troy-Bilt, Craftsman, or Yard Machines mowers, this blade represents a superior mulching experience over generic replacements. It provides a specialized function that elevates lawn care beyond a simple cut.

Representing the pinnacle of affordability, the wyevee 331737B mulching blade makes lawn mower maintenance accessible to everyone. This blade is engineered as a direct, budget-friendly replacement for a vast number of AYP, Craftsman, and Husqvarna models, solving the problem of a dull blade without a significant financial outlay. Its construction from carbon steel, enhanced with a protective coating, aims to deliver a sharp, clean cut right out of the box.

During use, the wyevee blade performs admirably for its cost, offering a noticeably cleaner cut than a worn-out original. With dimensions of 21-1/4″ in length and a 5/8″ round center hole, it’s crucial to verify your mower’s spindle before purchase for a proper fit. While it capably handles standard weekly mowing, its thinner 0.157″ profile may not withstand impacts from rocks or thick roots as robustly as premium OEM blades.

This blade is the ideal choice for homeowners with straightforward yards who need a functional, low-cost solution. In contrast to the GYZJ two-pack, the wyevee offers the absolute lowest entry cost for a single blade replacement, perfect for a quick fix before selling a home or for infrequent mowing needs. It delivers a revitalized cutting experience that far outweighs its minimal investment.

Maximizing value without sacrificing functionality, the budrash 942-0741A two-pack is a strategically smart purchase for any homeowner. Getting two blades in one package means you’re prepared for the entire season, with a fresh blade ready for a mid-summer swap to maintain peak cutting performance. This 3-in-1 blade is designed for versatility, effectively handling bagging, side-discharging, and mulching for a wide array of Craftsman, Troy-Bilt, and MTD mowers.

These blades demonstrate impressive versatility in the yard, easily transitioning from mulching dry leaves in the fall to bagging lush spring growth. The bow-tie center hole and 2-1/2″ center-to-center outer holes ensure a secure fit on compatible models, delivering a stable and efficient 21-inch cut. The pre-sharpened edges get you mowing immediately, providing a clean, healthy cut that helps prevent grass disease.

The primary appeal here is the undeniable value proposition. While the single CRAFTSMAN OEM blade promises a perfect factory fit, the budrash pack provides two functional blades, effectively doubling the service life for a comparable investment. For the pragmatic homeowner managing a typical suburban lawn, this two-pack is the most economical and forward-thinking craftsman 21 lawn mower blade replacement available.

Unleashing ultimate versatility, the Stens 300-121RT-STN is the problem-solver for those with older mowers or uncertainty about their exact model specifications. This blade’s genius lies in its universal design, which includes a comprehensive set of washers and adapters to fit the vast majority of walk-behind mowers with a 21-inch deck. It single-handedly eliminates the frustrating search for obscure or discontinued parts, offering a reliable 3-in-1 solution for nearly any machine.

In practice, the installation requires a few extra minutes to select the correct adapter, but the result is a surprisingly secure and well-balanced fit. The blade’s performance is solid across bagging, mulching, and side-discharge functions, providing a consistent cut that revives an older mower’s effectiveness. Its strength is not in being the absolute best at any single task, but in being dependably good at all of them, regardless of the mower brand.

Unlike the MTD Genuine Parts blade which is tailored for a specific family of mowers, the Stens blade is the jack-of-all-trades, making it the perfect item to have on hand in a workshop or for a landscaping professional. It offers a trade-off of hyper-specialized performance for near-limitless compatibility. For anyone struggling to find a specific craftsman 21 lawn mower blade replacement, this universal blade is the definitive answer.

Engineered as a premium aftermarket alternative, the KEDAKEJI 21-inch blade brings robust materials and precision manufacturing to the replacement market. This blade stands out with its claims of high-strength, heat-treated steel, designed to offer superior wear resistance and a longer-lasting sharp edge. It is a direct replacement for the popular 942-0741A part number, making it a compelling choice for owners of compatible Troy-Bilt, Cub Cadet, and Craftsman mowers seeking durability.

The blade’s performance is defined by its clean, crisp cut, a result of the rigid, heat-treated construction that resists flexing even in thick grass. Its mulching capabilities are excellent, with a 1-1/8″ lift that helps circulate clippings effectively under the 21-inch deck. The painted cutting edges are a thoughtful touch, preventing rust during shipping and protecting hands during installation, though this coating wears away with the first use as intended.

When compared to the budrash two-pack, the KEDAKEJI blade positions itself as a higher-quality single-blade option. The focus here is on material science and longevity rather than quantity, appealing to the user who would rather buy one superior blade than two standard ones. For those prioritizing a long-lasting, sharp edge in their craftsman 21 lawn mower blade replacement, this is a top-tier contender.

Offering an unbeatable combination of quantity and compatibility, the GYZJ two-pack is a fantastic value for owners of Craftsman, Husqvarna, and Poulan mowers. This set provides a full season’s worth of sharp blades, ensuring your mower is always ready to deliver a clean, healthy cut without a last-minute trip to the store. With an extensive list of compatible part numbers and a 5/8″ round center hole, it is a versatile solution for a huge segment of the market.

These blades perform reliably, matching the cutting quality of many factory originals right out of the box. The 21 1/16″ length and 2 1/4″ width are standard dimensions that ensure proper fit and deck clearance on compatible models. For homeowners who mow large properties or encounter rougher conditions that dull blades more quickly, having an immediate, identical replacement on hand is a significant advantage.

This GYZJ two-pack directly competes with single-blade budget options like the wyevee 331737B by offering double the product for a marginally higher investment. It is the perfect purchase for the forward-thinking homeowner who values both economy and preparedness. It ensures you get a great cut today and have a sharp solution ready for tomorrow.