A dull blade on a 42-inch Craftsman deck doesn’t just shred grass, it stresses the whole machine. Uneven cuts brown out within a day, the deck works harder to pull thick grass through, and your weekend stretches another hour. For anyone mowing a half-acre or more, fresh blades are the cheapest performance upgrade you can make, but the wrong part number means a blade that won’t seat on the spindle at all. The list below maps nine solid aftermarket options to the specific Craftsman, Husqvarna, and John Deere decks they actually fit, so you spend less time squinting at model numbers and more time mowing.
The Essentials At A Glance
Terre 2-Pack High Lift Blades for John Deere 42″ Decks
Grasscool 138971 42″ Deck Craftsman Bagging Blades
Grasscool 42″ Deck Mulching Blades for Craftsman 422719
Oregon 42 Inch Lawn Mower Blades for John Deere
Grasscool 42″ Craftsman Mower Mulching Blades 134149
Grasscool 942-04308 Blades for Troy Bilt Cub Cadet 42″
Caltric 2-Set 42″ Blade for Husqvarna YTH Models
ILONPA 138971 5-Star Mulching Blades 2-Pack
Geosiry 942-04308 42″ Mower Blades for Troy Bilt
More Details On Our Top Picks
The Terre 2-Pack lands first because high-lift blades are what bagging and side-discharge decks crave: more sail area on the wing pulls grass straight up before cutting, which sends clippings cleanly out the chute instead of matting under the deck. Each blade measures 21-1/4 inches long with a 2-3/4-inch width and a 0.157-inch thickness, riding a 7-point star center hole that fits John Deere 42-inch decks on models like the LT180, X300, and X304.
Replacing both at once keeps the deck balanced, and the matched pair helps the spindle bearings last longer because neither side fights the other. Owners with very thick, wet spring grass tend to see the biggest improvement, since high-lift blades throw clippings aggressively instead of letting them clump under the shell.
A Strong Showing
- High-lift sail profile creates strong suction for tall spring growth
- 0.157-inch thickness resists bending when you hit a hidden root
- Sold as a matched pair, so both sides of the deck wear at the same rate
- 7-point star mounting matches common John Deere spindle hardware
- Length of 21-1/4 inches fits the standard 42-inch cut geometry
Things To Consider
- Not a Craftsman fit by default, so confirm your deck’s spindle pattern before ordering
- High-lift blades can bog down small engines on slopes; throttle up before engaging
- Steel will dull faster than premium alloys in sandy soil
Key Specs
Who Will Love This
John Deere owners with 42-inch decks who bag regularly or push through tall fescue and Bermuda in spring growth.
Look Elsewhere When
You run a Craftsman LT1000, since the Grasscool 138971 blade is built specifically for that 5-point star spindle.
If your Craftsman is an LT1000, LT2000, or T110 with a 5-point star spindle, the Grasscool 138971 lands as the closest thing to a direct OEM swap without paying dealer prices. The blade pattern matches the original 138971 spec, which Craftsman and Husqvarna have shipped on these decks for years, so installation is the usual deck-raise, pull-the-pin, swap routine.
The 5-point star center hole is the deciding factor here, and the listing goes out of its way to remind shoppers about it. A 6-point star blade looks identical at a glance, so check the hole shape on your existing blade before clicking order. For bagging-heavy yards, the lift profile gets clippings moving toward the chute instead of recirculating under the shell.
Noteworthy Benefits
- Direct 138971 spec replacement for Craftsman LT series decks
- 5-point star mounting fits OEM spindle hardware
- Bagging-friendly lift throws clippings into the chute
- Also fits many Husqvarna YTH and Poulan Pro models
Worth Noting
- Check your existing blade for a 5-point star, not a 6-point star, before ordering
- Bagging profile produces more dust in dry conditions
Made For
Craftsman LT1000, LT2000, and T110 owners who bag clippings and want an OEM-spec blade without the OEM price.
A Better Fit Elsewhere
You prefer mulching over bagging, since the Grasscool 422719 mulching blade is purpose-built to recirculate fine clippings back into the lawn.
Mulching blades aren’t just high-lift blades with extra curves; the sail profile is tuned to keep clippings circulating under the deck until they’re cut three or four times, which is what produces the fine, soil-feeding pieces you actually want. The Grasscool 422719 follows that curved-tooth pattern and replaces Craftsman part numbers 422719, 134149, 532134149, 424752, and 138971 across LT1000, LT2000, YT4000, DLT3000, and DYT4000 riding mowers.
The 5-point star mounting is the same as the bagging Grasscool blade above, so your deck swap is straightforward. For homeowners who skip the bag entirely and mow often enough that clippings stay short, this blade returns nutrients to the turf without the visible clumps that turn a clean cut into a mess.
Strengths Worth Knowing
- Curved mulching tooth profile recirculates clippings for a finer cut
- Covers five OEM part numbers for broad Craftsman compatibility
- 5-point star mounting fits LT, YT, and DYT series decks
- Returns nitrogen-rich clippings back to the soil
Trade Offs
- Performs best when you mow frequently and never let grass get too tall
- Wet, heavy grass can clog under the deck until the blades clear it
Feature Snapshot
Right Fit For
Homeowners who mow weekly, skip the bag, and want clippings returned to the lawn as natural fertilizer.
Reach For A Different Pick When
You mostly bag or side-discharge tall fescue, in which case the Grasscool 138971 bagging blade handles heavy lift better.
Oregon has been in the cutting-tool business long enough that their mower blades tend to carry heavier steel than the typical aftermarket pack. This 42-inch replacement uses 21-3/8-inch blades with a 2.5-inch width and a 0.203-inch thickness, which is meaningfully thicker than most competitors in this category. That extra material is the difference between a blade that survives a hidden stump and one that folds on contact.
The fit list targets John Deere 100-series decks (102, 115, 125, 135) and replaces OEM part numbers GX22151, AM137328, AM141033, GY20850, and UC21583. If your yard includes tree roots, stray rocks, or an apple tree that drops debris, the heavier steel earns its keep over a season.
What Pays Off
- 0.203-inch blade thickness, heavier than most competitors
- Replaces five OEM John Deere part numbers
- 7-point star center hole matches 100-series spindles
- Steel gauge handles minor debris without folding
Honest Caveats
- Heavier steel demands slightly more engine torque on startup
- Designed for John Deere spindles; Craftsman fit will not match
Best Suited To
John Deere 100-series owners with rough yards, tree debris, or rocky soil who want blades that survive contact.
Swap It Out When
You run a Craftsman LT2000 or similar AYP-built deck, since the Grasscool 138971 blade matches that 5-point star spindle.
For shoppers who run a mixed fleet, or who aren’t sure which of two adjacent Craftsman models they actually own, the Grasscool 134149 mulching set covers a wide compatibility list. The 5-point star mounting fits Craftsman LT1000, LT2000, T110, T210, T300, plus Husqvarna YTH18542, YTA18542, YTH1542XP, LTH1342, and a long list of Poulan Pro decks.
The mulching teeth recirculate clippings under the deck until they’re chopped fine, which works well for weekly-cut lawns and turns the bagging attachment into optional equipment. Where the listing earns its keep is the cross-brand coverage, which means you can stock one set for two different mowers without measuring center holes twice.
The Upside
- Cross-brand fit for Craftsman, Husqvarna, and Poulan 42-inch decks
- Mulching profile produces fine clippings for soil return
- 5-point star mounting matches the most common Craftsman pattern
- Helpful for households running two different mower brands
Points To Note
- Verify your deck uses a 5-point star, not a 6-point star, before ordering
- Mulching blades can struggle in very tall or wet grass
Spec Overview
Who Should Grab It
Mixed-fleet households that own a Craftsman alongside a Husqvarna or Poulan and want one blade SKU to cover both.
Consider Something Else When
You need a dedicated bagging blade, in which case the Grasscool 138971 bagging set is purpose-built for chute discharge.
The MTD family of decks (Cub Cadet, Troy-Bilt, MTD Gold, Bolens, Yard Machines, Yard-Man, Huskee) shares one of the most common 42-inch spindle layouts on the market, and the 942-04308 part number has been the OEM spec since 1997. Grasscool’s version targets the riding mower, RZT, lawn tractor, and zero-turn mower crowd across that whole brand family, including Cub Cadet XT1 and ZT1 decks.
The listing spells out model-level fit for Troy-Bilt Pony 42, Super Bronco 42 Hydro, Bronco 42 Auto, and TB1942, plus their Cub Cadet siblings. If your deck is an MTD-built unit, the center hole shape and length have stayed consistent for nearly three decades, which means the aftermarket supply chain is mature.
Practical Pluses
- Targets the entire MTD brand family on a 42-inch deck
- Compatible with Cub Cadet XT1 and ZT1 zero-turn models
- Fits riding, lawn tractor, and zero-turn configurations
- Mature aftermarket means broad availability
Things To Consider
- MTD deck layout means Craftsman fit only when the deck is MTD-built
- Verify the center hole shape against your existing blade
At A Glance
Best Suited To
Cub Cadet XT1, ZT1, or Troy-Bilt Pony and Bronco owners with a 42-inch deck built by MTD.
Where A Sibling Pick Shines
You run a Craftsman LT1000, where the Grasscool 138971 bagging blade matches the AYP spindle pattern instead.
Caltric ships a two-blade set in one box, which is exactly how 42-inch decks expect their blades to arrive: balanced, matched, and ready to install as a pair. The fit list targets older Husqvarna riding mowers including LS 2042, LT 140, LT 16542, LT 18542, LTH 1342, YTH 18542, YTH20B42T, and YTH20F42T, covering a generation of AYP-built decks that share spindle geometry.
For homeowners with a 2000s-era Husqvarna that’s due for a fresh cut, the two-blade pack saves the hassle of ordering two single-blade SKUs separately. The blade geometry leans toward standard lift, which works fine for side-discharge mowing without the aggressive sail of a bagging blade.
Notable Upsides
- Two-blade set ships ready to install on both sides of the deck
- Broad Husqvarna fit including LS, LT, LTH, and YTH series
- Standard lift profile suits side-discharge mowing
- Cost-effective option for older Husqvarna decks
Where It May Fall Short
- Standard lift produces less suction than bagging-optimized blades
- Older Husqvarna fit list; verify against your operator manual
Whose Shelf It Belongs On
Owners of older Husqvarna riding mowers with LS, LT, LTH, or YTH model numbers who want a matched two-blade set.
Skip It When
You need mulching performance, in which case the Grasscool 134149 set delivers the curved tooth design for finer clippings.
ILONPA’s 138971 5-star set covers an unusually long cross-reference of OEM part numbers, including 138971, 532138971, 127843, 532127843, 138498, and 532138498, plus Ariens 21546095 and Snapper 704429. The 5-point star mounting lands it on Craftsman LT1000, LT2000, T110, T210, T300, Husqvarna YTH22V42, YTH18542, YTA18542, and the Poulan 42-inch deck family.
The mulching tooth profile recirculates clippings for a fine cut, which suits homeowners who skip the bag and mow on a regular cadence. For shoppers running both a Craftsman and a Husqvarna, or who inherited a deck and aren’t sure of its origin, the cross-reference list is the deciding factor.
Well-Handled Touches
- Cross-references a dozen OEM part numbers across multiple brands
- 5-point star mounting fits Craftsman, Husqvarna, Poulan, Ariens, and Snapper decks
- Mulching tooth profile produces fine clippings for soil return
- Two-pack means balanced installation on both sides of the deck
Things To Keep In Mind
- 5-point star only, so verify your existing blade before ordering
- Mulching blades need regular mowing to perform at peak
Perfect Match For
Shoppers with a deck of uncertain origin who need a blade that crosses multiple OEM part numbers within the AYP family.
Where Another Pick Suits Better
You need high-lift bagging performance, in which case the Grasscool 138971 bagging blade delivers stronger chute airflow.
Geosiry targets the same MTD 942-04308 spec that Grasscool covers above, but it cross-references a slightly different OEM part list: 742-04308, 742-04308A, 942-04308A, 742-0656, 942-0656, 742-04312, 942-04312, 490-110-M108, and OCC-742-04312. If your operator manual lists one of the older prefix numbers, this blade is the one to match.
The fit covers Troy-Bilt Pony, Bronco, Mustang, and zero-turn models alongside Cub Cadet decks, which means it lands on the same MTD-built 42-inch deck family. For shoppers whose deck is older or whose paperwork lists a 742-prefix part number, the Geosiry listing reads as the most direct cross.
Useful Highlights
- Cross-references both 742 and 942 prefix OEM part numbers
- Fits Troy-Bilt Pony, Bronco, Mustang, and Cub Cadet decks
- Targets the long-running MTD 42-inch spindle spec
- Useful for older decks with paperwork in hand
Some Limits To Know
- MTD spindle only, so Craftsman and Husqvarna fit will not apply
- Standard lift produces less chute suction than bagging blades
Built With In Mind
Troy-Bilt Pony, Bronco, and Mustang owners with older decks whose operator manuals list a 742-prefix part number.
Not Your Match When
You run a Craftsman LT1000, since the Grasscool 138971 blade matches the AYP 5-point star spindle instead.
What Matters Most When Choosing Replacement Blades
Center Hole Pattern Is The First Filter
The single most common reason a 42-inch blade doesn’t seat on the spindle is a wrong star count. Craftsman, Husqvarna, and Poulan decks built by AYP use a 5-point star, while John Deere 100-series and many Cub Cadet decks use a 7-point star. Pull your existing blade and count the points before ordering, since a 6-point star blade can look identical to a 5-point at a glance.
High-Lift Versus Mulching Profile
A high-lift blade has more aggressive sail curvature on the wing, which pulls grass up vertically and throws clippings forcefully out the chute. That profile is what bagging and side-discharge mowing want, especially in tall or wet grass. A mulching blade has more curve and longer cutting edges, which keep clippings circulating under the deck until they’re chopped several times. That profile is what homeowners who skip the bag and mow often want, since the fine clippings drop back into the turf as natural fertilizer.
Steel Thickness And Yard Conditions
Blade thickness is the spec that separates budget steel from blades built for rough yards. A 0.157-inch blade handles normal residential mowing. A 0.203-inch blade (Oregon’s spec, for instance) survives the occasional hidden root or rock strike without folding. For sandy soil or rocky yards, the extra gauge pays for itself across a season.
Two Blades Per Deck Means A Two-Pack
Every 42-inch deck uses two blades that counter-rotate to balance the spindle. Replacing one blade at a time is a false economy, since the older blade dulls faster and forces the newer blade to work harder. A two-pack lets you swap both at once, which keeps the deck balanced and the spindle bearings happier over time.
Smart Choices Across The Category
Where Shoppers Go Wrong
The biggest misstep is trusting deck size alone. Two mowers can both have 42-inch cutting decks and still use different spindle patterns, so ordering a blade by “fits 42-inch Craftsman” without checking the center hole shape is the fastest path to a blade that won’t seat. Always pull the existing blade and count the star points, or measure center-to-center on the mounting pattern, before clicking order.
What Separates Premium From Basic
Premium blades spend the extra money in three places: thicker steel for impact resistance, harder heat treatment for edge retention, and tighter tolerance on the center hole so the blade seats true on the spindle. For homeowners mowing a small, clean lawn every week, basic blades perform fine. For anyone mowing rough ground, thick spring growth, or sandy soil, premium blades earn their keep by staying sharp longer and surviving the occasional contact with a hidden obstacle.
Frequently Asked Questions
How Do I Know If My Craftsman Has A 5-Point Or 6-Point Star?
Pull the existing blade and look at the center hole where it mounts to the spindle. A 5-point star has five distinct lobes around the opening, while a 6-point star has six. The Craftsman LT1000, LT2000, and T110 decks typically use the 5-point star pattern, which is what the Grasscool 138971 and ILONPA 138971 blades match.
Can I Use Mulching Blades Without A Mulching Kit?
Yes. The blades themselves do most of the work by keeping clippings circulating under the deck. A dedicated mulching kit adds a baffle that further restricts clippings from escaping, which produces slightly finer pieces, but the blades alone get you most of the benefit on a stock deck.
How Often Should I Replace Lawn Mower Blades?
Most homeowners sharpen blades once per season and replace them every two to three seasons, depending on yard conditions. Sandy soil and rocky lots dull edges faster, while clean turf can stretch the interval. A quick visual check is the easiest guide: if the cut edges look rounded rather than crisp, it’s time to sharpen or replace.
Will High-Lift Blades Work Better For Bagging?
Generally yes. The extra sail area on a high-lift blade pulls more air up under the deck, which throws clippings forcefully into the bagging chute. For homeowners who bag every mow, a high-lift profile is usually worth the slight engine load tradeoff, especially in tall or wet spring grass.
Do Aftermarket Blades Void My Warranty?
In most cases, using aftermarket replacement blades does not void a mower warranty, since the Magnuson-Moss Warranty Act allows aftermarket components unless the manufacturer can prove the part caused the failure. Always retain your purchase records and inspect the blade before installation to confirm fit.
Closing Thoughts
The right blade comes down to three checks: confirm your deck’s center hole pattern, decide whether you want bagging lift or mulching recirculation, and replace both blades as a matched pair. With those in place, any of the nine options above will restore the clean cut your Craftsman, Husqvarna, or MTD-built deck was designed to deliver.