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Selecting a replacement lawn mower blade troy operators can rely on requires balancing cutting deck diameter, blade aerodynamics, and spindle hub compatibility. Troy-Bilt mower platforms primarily split into walk-behind units with 21-inch decks and riding tractors or zero-turn mowers equipped with 42-inch decks. A single walk-behind blade prioritizes versatile airflow to support mulching, side discharge, and rear bagging from a single under-deck chamber. In contrast, dual-blade assemblies on 42-inch platforms require high-lift air foils that generate significant upward draft, forcing grass clippings across a broad cutting deck and into discharge chutes or collection hoppers.
This manufacturer compatibility lineup is organized around two specific original equipment manufacturer patterns: the 942-0741A walk-behind specification and the 942-04308 riding deck specification. Walk-behind 21-inch blades in this group use a bow-tie center mount designed to lock onto walk-behind motor spindles, while the 42-inch tractor blades utilize a 6-point star center hole that fits riding tractor spindle shafts. Understanding this troy bilt lawn mower blade comparison ensures you match your machine’s physical mount and horsepower profile to the cutting edge best suited for your turf conditions.
This guide by the numbers
9.4/10
Best rated model
Our highest score in this line-up
5
Models on file
Models in this guide that have a stored product record
3
Brands involved
Distinct brand names on the product records used here
Prices and specifications come from the stored Amazon listing data for the products in this article. Scores are out of 10, based on listed specifications and buyer feedback.
Troy-Bilt Lawn Mower Blades Lineup at a Glance
| Product Name | Deck Size | Center Hole Shape | Blade Purpose | Material |
|---|---|---|---|---|
| Grasscool 942-0741A Troy Bilt 21 inch | 21 Inch | Bow Tie | 3-in-1 Mulching, Bagging, Side Discharge | 40MnB Steel |
| Maxpower 331528B USA MADE 21″ Cut | 21 Inch | Bow Tie | Mulching | Steel (USA Made) |
| Grasscool 942-04308 High Lift Blades | 42 Inch | Riding Deck Pattern | 2-in-1 Bagging and Side Discharge | 40MnB Steel |
| GICOOL 942-0741A 21 inch Mulching Mower | 21 Inch | Bow Tie | 3-in-1 Mulching, Bagging, Side Discharge | 40MnB Steel |
| GICOOL 942-04308 Mower Blades for Troy | 42 Inch | 6-Point Star | 2-in-1 Bagging and Side Discharge | 40MnB Steel |
The Models in Detail
01
Grasscool 942-0741A Troy Bilt 21 inch
Grasscool 942-0741A Troy Bilt 21 inch
Buyer favouriteScored 9.2+/10
Best for: Troy-Bilt 21-inch push mowers tackling mixed grass
Pros
- Durable 40MnB alloy steel
- Versatile 3-in-1 cutting profile
- High 1-1/8 inch lift height
Cons
- Sold as single unit only
- Limited to bow tie spindles
The Grasscool 942-0741A Troy Bilt 21 inch is engineered specifically for homeowners operating walk-behind, push, and self-propelled mowers equipped with 21-inch decks manufactured from 1995 onward. Built from heavy-duty 40MnB steel, this replacement measures 20 7/8 inches in length, 2-1/4 inches in width, and 9/64 inches in thickness. It features a specialized bow-tie center hole pattern flanked by outer locating holes set at an outside diameter of 5/16 inch to provide a snug, secure fit on factory spindle adapters. The blade weighs 1.75 pounds and incorporates an integrated 1-1/8 inch lift curve designed to drive airflow under the mower deck.
According to the product specifications, this blade functions as a 3-in-1 cutting accessory that accommodates mulching, bagging, and side discharge. The wing geometry generates enough vacuum to handle debris-filled yards with twigs and leaves, damp or dewy grass without clogging, and weedy turf by lifting and severing seed heads. Its broad equipment compatibility spans Troy-Bilt models including the TB105, TB110, TB120, TB130, TB160, TB200, TB210, TB230, TB240, and TB270 ES, along with classic series like Tru-Cut, Tuff-Cut, and Pro-Cut. If you manage an alternative setup alongside your primary mower, evaluating options such as PowerSmart lawn mower blades compared shows how walk-behind deck geometry dictates cutting edge curvature.
This model is ideal for residential property owners who use a single walk-behind mower for seasonal cleanups, damp morning cuts, and routine mulching. However, because it is sold as a single unit with a bow-tie center hole, it cannot be mounted to larger lawn tractors or zero-turn mowers that require multi-blade sets with star-shaped mounting spindles.
02
Maxpower 331528B USA MADE 21″ Cut
Maxpower 331528B USA MADE 21″ Cut
Buyer favouriteScored 9.2+/10
Best for: Walk-behind operators prioritizing domestic manufacturing quality
Pros
- Manufactured in the USA
- Protective powder-coated cutting edge
- Meets or exceeds OEM specifications
Cons
- Requires initial cut to expose edge
- Listing omits steel grade spec
The Maxpower 331528B USA MADE 21″ Cut delivers a domestic manufacturing option designed to replace factory OEM numbers 742-0741, 742-0741A, 942-0741, and 942-0741A on 21-inch cut machines. The blade measures 21 inches in overall length and 2-1/4 inches in width, weighing in at 1.6 pounds. To ensure seamless alignment with standard walk-behind spindle assemblies, it incorporates a bow-tie center hole design with outside holes measuring 5/16 inch in diameter, spaced 2.5 inches center-to-center. The manufacturer specifies that all blades are sharpened during production and then treated with a protective powder coating.
This powder coating protects the sharpened edge during shipping and handling, and the listing notes that the layer wears away cleanly during the first cut to expose the precision cutting edge beneath. Built to meet or exceed OEM specifications, this blade provides dependable mulching performance on an extensive range of Troy-Bilt walk-behind mowers, including the TB 105, TB 115, TB 125, TB 130 XP, TB 140, TB 160 XP, TB 220, TB 270 XP, TB 280 ES, TB 330, TB 360, TB 370 XP, and heavy-duty TB 400 XP platforms. It is tailored to process grass blades repeatedly within the deck cavity to return fine clippings to the soil.
This model is best for hobbyists who favor American manufacturing standards and straightforward mulching duty on dry to lightly damp turf. It gives way to aggressive high-lift blades when an operator moves from a push mower to a riding tractor, as its 21-inch bow-tie layout cannot provide the high-velocity discharge necessary for large multi-blade riding mower decks.
03
Grasscool 942-04308 High Lift Blades
Grasscool 942-04308 High Lift Blades
Buyer favouriteScored 9.2+/10
Best for: Troy-Bilt 42-inch tractor owners using collection baggers
Pros
- Tough 40MnB steel composition
- Strong high-lift collection airflow
- Replaces common 942-04308 part numbers
Cons
- Not designed for fine mulching
- Listing omits detailed blade dimensions
The Grasscool 942-04308 High Lift Blades are built specifically for homeowners running lawn tractors, riding mowers, and zero-turn platforms fitted with 42-inch cutting decks built from 1997 to the present. Forged from 40MnB alloy steel, this product package weighs 3.4 pounds and functions as a direct replacement for OEM part numbers 942-04308, 942-04308A, 742-04308, 742-04308A, 742-04312, and 942-0656. The listing highlights a heavy-duty design intended to withstand abrasive debris, rough terrain, and high-rpm blade spindle operation.
Functioning as a 2-in-1 blade set, this design is optimized exclusively for side discharging and rear bagging collection systems. The trailing blade edges feature elevated high-lift wings that generate a powerful air vortex beneath the deck, propelling clippings cleanly through the discharge chute and deep into grass catchers with minimal chute clogging. Property owners who operate a dedicated Troy-Bilt bagger attachment will find that this high-lift airflow is essential for packing collection bags efficiently and preventing clumps on the lawn. Compatible machines include Troy-Bilt Pony 42 7-Speed, Pony 42X, Super Bronco 42 Hydro, Bronco 42 Auto, TB42, TB1942, TB2142, Colt XP, Mustang XP 42, Range Rider, and RZT 42.
This package is the ideal match for operators of 42-inch Troy-Bilt riding mowers who demand maximum collection efficiency and tall-grass side discharge. It is not suitable for walk-behind mowers, nor is it intended for fine lawn mulching where clippings must stay suspended under the deck rather than being ejected through the chute.
04
GICOOL 942-0741A 21 inch Mulching Mower
GICOOL 942-0741A 21 inch Mulching Mower
Best for: Walk-behind owners needing verified mounting measurements
Pros
- Full published dimension specifications
- Rust-resistant edge coating
- Triple-function multi-curve geometry
Cons
- Lower 26/32 inch air lift profile
- Single blade configuration only
The GICOOL 942-0741A 21 inch Mulching Mower blade is a precision replacement part crafted for 21-inch walk-behind decks across the Troy-Bilt catalog. Manufactured from 40MnB steel with a rust-resistant coating on the cutting edge, this blade features exact dimensional specifications: length of 20-30/32 inches (531.5 mm), width of 2-3/16 inches (55 mm), thickness of 9/64 inches (3.5 mm), and a cutting edge length of 6-3/16 inches (157 mm). It utilizes a standard bow-tie center hole alongside two 5/16-inch (8 mm) side holes spaced 2-1/2 inches (63.5 mm) center-to-center. The blade produces an air lift profile of 26/32 inches (20 mm) and weighs 1.75 pounds.
The multi-curve wing design gives this blade true 3-in-1 utility, supporting fine mulching, side discharging, and grass collection bagging. Its balanced aerodynamic profile generates steady airflow to reduce clippings into fine particles that quickly decompose, while maintaining sufficient lift to push clippings out the side chute or back into a grass catcher without bogging down the engine. It covers extensive Troy-Bilt walk-behind fitments, including the TB 105, TB 110, TB 115, TB 120, TB 125, TB 130, TB 140, TB 160, TB 200, TB 210, TB 220, TB 230, TB 240, TB 270 ES, TB 320, TB 360, TB 370 XP, and TB 400 XP. Those exploring compact walk-behind options might compare this blade’s dimensions against a Greenworks 16-inch lawn mower blade to see how blade mass and lift heights vary between deck widths.
This blade suits detail-oriented homeowners who want verified dimensional specs for their walk-behind push or self-propelled mower. It gives way to riding deck models when you are outfitting a tractor, as its 21-inch bow-tie profile cannot mount to 42-inch deck spindles.
05
GICOOL 942-04308 Mower Blades for Troy
Best for: Troy-Bilt 42-inch zero-turn and tractor owners
Pros
- Heavy-duty 5/32 inch blade thickness
- Tall 1 inch air-lift wing
- Direct-fit 6-point star center hole
Cons
- Lacks dedicated mulching serrations
- Heavier 4.55-pound shipping weight
The GICOOL 942-04308 Mower Blades for Troy package provides a dual-blade high-lift configuration built for 42-inch riding tractors and zero-turn mowers. Fabricated from thick 40MnB alloy steel with a rust-resistant finish, each blade measures 21-3/16 inches (538 mm) in length, 2-3/8 inches (60 mm) in width, and an extra-sturdy 5/32 inches (4 mm) in thickness. The blades feature a 6-point star center hole with a 5/8-inch (16 mm) diameter, engineered to mate directly to 6-point star spindle shafts. The overall shipping weight for the set is 4.55 pounds.
Designed as a 2-in-1 high-lift blade assembly, these units generate a prominent 1-inch (25.5 mm) air lift. This tall wing geometry produces a high-velocity air stream that excels in demanding conditions such as overgrown turf or morning-damp grass, lifting flattened blades for an even cut and driving heavy clippings into a collection hopper or across a wide side-discharge pattern. The listing indicates direct OEM replacement for numbers 742-04308, 742-04308A, 942-04308, 942-04308A, 742-0656, 942-0656, 742-04312, and 942-04312. It fits Troy-Bilt 42-inch platforms such as the Pony, Bronco, and Super Bronco series, as well as compatible zero-turn units.
This model is the ideal choice for riding tractor operators dealing with heavy turf growth, tall weeds, and bagger-dependent collection routines. It is not compatible with walk-behind mowers requiring bow-tie hubs, nor should it be selected for closed-deck mulching where high air velocity could cause premature grass buildup against the deck baffles.
Matching a Model to Your Setup
- For maintaining standard residential lawns with a Troy-Bilt TB110 or TB130 walk-behind mower while switching between mulching and bagging, choose the Grasscool 942-0741A Troy Bilt 21 inch for its balanced 1-1/8 inch lift and 40MnB steel build.
- For operators who prefer American-made replacement parts on their 21-inch push mowers, select the Maxpower 331528B USA MADE 21″ Cut to achieve reliable mulching with factory powder-coated edge protection.
- For powering through thick turf with a Troy-Bilt Pony 42 or Super Bronco riding tractor connected to a grass collection bagger, install the Grasscool 942-04308 High Lift Blades for their debris-clearing air velocity.
- For owners of walk-behind Troy-Bilt models who need exact, published measurement tolerances and rust-resistant coatings on their cutting edges, select the GICOOL 942-0741A 21 inch Mulching Mower.
- For tackling heavy, overgrown, or damp turf on a 42-inch riding mower with 6-point star spindles, mount the GICOOL 942-04308 Mower Blades for Troy to utilize their rigid 5/32-inch thickness and 1-inch high-lift wings.
Before You Buy
When reviewing these replacement blade options, take note of what the listings do not include. None of these product packages supply mounting hardware, such as spindle nuts, blade bolts, belleville washers, or spindle lock washers. You must reuse your existing factory hardware or purchase new fasteners separately. Furthermore, the listings do not supply mechanical torque specifications for tightening the spindle bolts; operators must consult their original equipment owner’s manuals to determine the exact foot-pounds required for safe operation.
Dimensional clarity also varies across the product listings. While the GICOOL models provide complete metric and imperial measurements for length, width, thickness, and air lift, other listings omit specific physical dimensions such as wing height or exact blade thickness, listing only package dimensions and total shipping weights. Always inspect your existing blade’s center hole pattern—verifying whether your machine requires a bow-tie shape or a 6-point star—and cross-reference your tractor or push mower part manual before purchasing to ensure proper mechanical fitment.
FAQ
What is the difference between a bow-tie center hole and a 6-point star center hole?
A bow-tie center hole features a specialized rounded shape with two flattened, flared lobes designed specifically for Troy-Bilt walk-behind and push mower spindle adapters. A 6-point star center hole features six distinct points engineered to fit over the splined spindle shafts found on 42-inch riding lawn tractors and zero-turn mowers. These two mounting styles are not interchangeable.
Can I install a 42-inch high-lift blade on a 21-inch push mower?
No. A 42-inch riding deck uses two blades that each measure approximately 21 inches in length, but they are built with different center mounting holes, heavier blade stock, and aggressive high-lift wings that require the horsepower of a riding tractor engine. Walk-behind mowers require a single blade with a bow-tie mount engineered for lower-horsepower push mower engines.
Why do some replacement blades have a painted or powder-coated cutting edge?
Manufacturers apply powder coating or rust-resistant treatments to protect the sharpened steel edge from corrosion and oxidation during warehouse storage and shipping. The Maxpower listing specifically notes that this coating is designed to wear away naturally during your first mowing session, exposing the precision-sharpened cutting edge underneath.
What is the advantage of 40MnB steel in mower blades?
The Grasscool and GICOOL listings specify 40MnB steel, which is an alloy steel formulated with manganese and boron. This metallurgical composition provides enhanced hardness, wear resistance, and impact toughness, allowing the cutting edges to withstand contact with twigs, coarse turf, and tough terrain better than untreated carbon steel.
Are 2-in-1 blades capable of mulching fallen leaves and grass?
The 42-inch 2-in-1 blades in this guide are engineered specifically for bagging and side discharge. While they will chop coarse debris as they rotate, their high-lift wing design drives air upward to eject clippings through the chute, rather than circulating them under the deck for the multiple cuts required by dedicated mulching blades.
