Craftsman 42-Inch Mulching Blades Spec Breakdown & Compatibility Guide

Best for: Demanding lawns needing maximum blade thickness

Pros

• Wide 2-1/2-inch lifting surface
• Extensive OEM cross-compatibility

Cons

• Slightly shorter 20-7/8-inch length
• Requires proper 5-point alignment

Best for: Standard single-blade residential deck maintenance

Pros

• Balanced 3-in-1 cutting geometry
• Efficient 1-1/16-inch aerodynamic lift
• Fits extensive AYP model list

Cons

• Single blade pack requires ordering two
• Thinner 9/64-inch steel gauge

Best for: Heavy mulching on overgrown rough terrain

Pros

• Thick 13/64-inch steel construction
• High-lift curved toothed mulching edge
• Reduces deck discharge clogging

Cons

• Heavier rotational load on spindles
• Coating requires initial wear-in

The Grasscool 42 inch Deck Craftsman Mower replacement is built specifically for riding tractors utilizing a 5-point star spindle shaft. It functions as a direct replacement for common OEM numbers including Craftsman, AYP, Husqvarna, and Poulan 134149, 138498, 138971, 139775, 532138498, 532138971, 532127843, 532134149, and 532139775. If you operate a classic craftsman riding mower such as a T110, LT1000, LT2000, YS4500, or YT3000 equipped with a 42-inch deck, this blade directly replaces factory equipment while upgrading the cutting geometry.

This model is built with heavy-duty steel measuring 13/64 inches (5 mm) thick, 2-1/2 inches (63.5 mm) wide, and 21 inches (533 mm) long. The high 1-inch (25 mm) lift combined with curved mulching teeth sets it apart from standard flat blades. These teeth re-circulate clippings back across the cutting path multiple times. The listing states that this high-lift airflow geometry increases bagging capacity by 50% when a collector is installed, while also reducing the risk of grass clumping and deck clogging in damp conditions. The cutting edges come coated in protective paint to inhibit surface rust during storage and handling, which quickly wears away during initial use.

This blade suits property owners dealing with rough terrain, weedy pastures, or neglected grass that requires aggressive pulverization. Because of its 5.44-pound shipping weight and thick 5 mm cross-section, it provides superior impact resistance against small hidden debris compared to lighter factory stampings. However, if your mower utilizes an MTD-sourced spindle with a 6-point star, this blade cannot be mounted safely.

• Dimensions: 21 inches long, 2-1/2 inches wide, 13/64-inch (5 mm) steel thickness.
• Center Hole: 5-point star mounting interface with 1-inch lift profile.
• Blade Geometry: Toothed 3-in-1 design supporting mulching, bagging, and side discharge.
• OEM Interchange: Replaces Craftsman and AYP 134149, 138971, 138498, and 139775.

Best for: Precise OEM replacement on AYP tractors

Pros

• Exact fit for 917-series models
• Extended 7-1/16-inch cutting edge
• Generous 1-5/64-inch air lift

Cons

• Narrower 2-1/4-inch blade profile
• Not suited for MTD builds

The UDC Parts 532134149 Craftsman 42 Inch comes as a two-pack engineered for homeowners who prioritize strict OEM model verification. Sold under part reference 532134149, this set replaces factory numbers 134149, 138971, 532138971, 138498, 532138498, 422719, 532424752, 424752, 21546095, 532127843, 127843, 594892701, 532422719, 577616134, 531005085, CMXGZAM110021, and CMXGZAM110136. The manufacturer listing emphasizes that fitment depends on the full serial model number, providing exact confirmation for specific Craftsman 917-prefix model builds.

Dimensionally, each blade measures 21 inches diagonally, 2-1/4 inches wide, and carries an air lift height of 1-5/64 inches. A notable specification on this blade is its extended 7-1/16-inch sharpened cutting edge, which maximizes the contact area with standing grass blades on every spindle revolution. This model works seamlessly when paired with a dedicated craftsman mulch plug to keep clippings circulating beneath the deck until finely shredded. The total weight of the two-blade package sits at 3.79 pounds, maintaining a balanced rotational mass that avoids overloading smaller horsepower engines.

This pair suits tractor owners who maintain established turfgrass and demand a clean, manicured finish without extra engine strain. It fits extensive variations of the Craftsman LT1000, LT2000, YT3000, YT4000, DYS4500, YS4500, and DLT3000. It gives way to heavier toothed options when clearing untamed brush, but excels at regular residential yard maintenance across standard cutting cycles.

• Dimensions: 21 inches diagonal length, 2-1/4 inches width, 1-5/64-inch air lift.
• Cutting Edge: Extended 7-1/16-inch milled cutting zone for clean slicing.
• Mounting: 5-point star center pattern for AYP and Husqvarna tractor decks.
• Model Precision: Verified for Craftsman LT2000 models 917289100 through 917289106.

Best for: MTD-built Craftsman mowers needing 6-point stars

Pros

• Direct 6-point star hub fit
• Aggressive center-directed gator teeth
• Heavy-duty 0.157-inch steel plate

Cons

• Incompatible with 5-point star decks
• Specific 21-1/4-inch overall length

The 942-04308-X Mower Blades Fit for Cub addresses a completely separate segment of Craftsman 42-inch mowers. While most older Craftsman lawn tractors use 5-point star shafts, units manufactured on MTD chassis require this specific 6-point star mounting design. This two-pack serves as a direct 942 04308 x craftsman blade substitute, replacing OEM numbers 742-0616A, 742-0616, 942-04308-X, 942-04360, 742-04410, 942-04126-X, 742P04308-X, 742-0616B, and 942-04410-0684.

The physical specifications of these blades diverge from AYP patterns. Each blade measures 21-1/4 inches long, 2-3/8 inches wide, and 0.157 inches thick, with a package weight of 3.64 pounds. The center hub features a 1-inch diameter 6-point star center hole, flanked by 5/16-inch side holes spaced 2-1/2 inches apart center-to-center. Designed as a gator-style mulching blade, the uplift teeth are angled toward the center of the blade body to redirect aerodynamic currents inward, keeping clippings suspended directly over the cutting edges.

This blade set is built specifically for owners of MTD-engineered Craftsman tractors, including the 604G, LT-1500, LT-2000, and T1000 variants that utilize 6-point spindles. Attempting to force these blades onto a 5-point star spindle will result in severe spindle damage or blade ejection. If your tractor deck possesses 6-point star star hubs, this set delivers dependable high-lift mulching and rapid 10-minute bolt-on installation.

• Dimensions: 21-1/4 inches long, 2-3/8 inches wide, 0.157-inch steel thickness.
• Mounting Spec: 1-inch 6-point star center hole with 5/16-inch side positioning holes.
• Aero Profile: Gator-style inward-facing serrated teeth for active clipping redirection.
• Cross Compatibility: Fits MTD-built Craftsman, Cub Cadet, and Troy-Bilt 42-inch decks.

The Grasscool 42 inch Lawn Mower Mulching blade is offered as a single-unit replacement for homeowners looking to replace a damaged or worn blade on an AYP-built 42-inch mower deck. Cross-referenced directly to OEM part numbers 422719, 134149, 532134149, 424752, and 138971, it provides an exact mechanical interface for 5-point star spindle hubs found on popular Craftsman LT1000, LT2000, YT4000, DLT3000, and DYT4000 tractors.

Unlike heavy toothed alternatives, this model features a continuous 3-in-1 mulching profile without aggressive top-edge serrations. It measures 21 inches (533 mm) in overall length, 2-1/4 inches (56.5 mm) in width, and has a steel thickness of 9/64 inches (3.5 mm). The integrated air lift measures 1-1/16 inches (27.5 mm), creating steady vertical suction to pull grass upright for an even horizontal cut before directing clippings into a side chute, collection bag, or back into the turf canopy as mulch.

This blade is suited for DIY homeowners maintaining standard residential lawns that experience regular cutting schedules. Its 3.6-pound package weight ensures low rotational inertia, which promotes quick engine spool-up and puts minimal strain on electric PTO clutches. Because the package contains only one blade, shoppers overhauling an entire dual-blade 42-inch deck will need to purchase two units to complete the installation.

• Dimensions: 21 inches length, 2-1/4 inches width, 9/64-inch (3.5 mm) thickness.
• Hub Pattern: 5-point star pattern engineered for AYP and Husqvarna spindle assemblies.
• Aerodynamic Lift: 1-1/16-inch curved wing for balanced suction and clipping dispersal.
• Operational Mode: Standard 3-in-1 mulching, bagging, and side discharge capability.

Best for: Commercial-grade mulching on Husqvarna-built decks

Pros

• Wide 2-1/2-inch commercial profile
• Manufactured in the USA
• Protective powder-coated finish

Cons

• Excludes MTD-built Craftsman decks
• Noticeable initial paint shedding

The MaxPower 561713XB 2 Commercial Mulching Blade set is an American-made heavy-duty upgrade for 42-inch Craftsman lawn tractors manufactured by Husqvarna. Designed to replace OEM numbers 127843, 138498, 138971, 134149, 138971X431, 532138971, 532127843, 532138498, and CMXGZAM110136, this two-blade set brings commercial-grade steel standards to residential cutting decks. The manufacturer documentation explicitly states that this set fits Craftsman models manufactured by Husqvarna and does not fit Craftsman models manufactured by MTD.

Each commercial mulching blade measures 21 inches in length and features a wider 2-1/2-inch profile. The set weighs 5.2 pounds, reflecting a substantial mass of steel that resists nicking, dulling, and gouging when mowing sandy or abrasive soils. The 5-point star center hole ensures a tight, centered tolerance on the spindle, eliminating high-speed rotational imbalance. MaxPower sharpens these blades during manufacturing and applies an electrostatic powder coating over the cutting edge, which shields the bare steel from rust during transit and strips away naturally during the first mowing session.

This dual-blade package suits demanding operators who maintain extensive acreage or mow overgrown pasture transitions where standard residential blades bend. While battery-powered platforms like an ego lawn mower blade demand ultra-thin steel to conserve watt-hours, this gas-tractor blade leverages engine torque to maintain blade speed through tough turf. It gives way to lighter blades if your tractor engine is under 14 horsepower, but remains a benchmark for durability on Husqvarna-built Craftsman decks.

• Dimensions: 21 inches long, 2-1/2 inches wide with reinforced commercial steel stock.
• Center Hole: 5-point star hub pattern matching AYP spindle shafts.
• Manufacturing: Precision sharpened and powder coated in the USA.
• Platform Limit: Fits Husqvarna-built Craftsman decks; strictly excludes MTD decks.

The 42 Inch Deck Mulching Blades 134149 by SCBHWJ provides a heavy-gauge two-blade replacement set engineered for extensive OEM interchangeability. This set cross-references against Craftsman numbers 134149, 138971, 138498, and 127843, as well as Husqvarna 532138971, 532134149, 532138498, 532127843, AYP 127843, 139775, and Ariens 21546095. It mounts onto any 42-inch Craftsman tractor utilizing 5-point star spindle shafts, including YT3000, YT4000, LT1000, LT2000, YS4500, and DYT4000 models.

The combined package weight for the pair is 5.34 pounds. The slight reduction in length to 20-7/8 inches provides a tiny margin of extra clearance inside older tractor decks where warped shells or worn spindle bearings might cause standard 21-inch blades to contact the deck walls or baffle welds.

This set is an ideal choice for tractor owners who frequently encounter buried obstacles, exposed tree roots, or rocky soil that deform lighter-gauge stampings. For owners of standard lawns without debris risks, a lighter blade may spool up faster, but this heavy-gauge pair excels in demanding operational environments.

• Mounting: 5-point star center interface matching AYP and Husqvarna 42-inch decks.
• Total Mass: 5.34 pounds combined weight across the dual-blade configuration.
• Clearance Design: 20-7/8-inch length prevents deck shell rubbing on older tractors.