Caltric 30" 38" Deck Blade Compatible with John Deere STX30 STX38 STX46 / AM141040 M112991 M154158 AM137325 AM100991 AM137326 AM137326 M154159 Mulching

What It Is

This is a set of aftermarket mulching blades from Caltric, designed for 30-inch and 38-inch cutting decks on John Deere STX30, STX38, and STX46 lawn tractors. They are intended for mulching grass clippings (not bagging or side-discharge).

Fitment & Compatibility

• Deck size: Fits 30" and 38" decks only. Does not fit 46" decks (the STX46 uses a different blade pattern).
• Models: John Deere STX30, STX38, STX46 (check your deck measurement, not model number alone).
• OEM cross-references: Replaces John Deere AM141040, M112991, M154158, AM137325, AM100991, AM137326, M154159.
• Measure before buying: Blade length is 15.5 inches (center hole to tip). Center hole is 5/8" diameter. Check your existing blade’s length and hole size to confirm.
• Aftermarket note: These are not OEM John Deere blades. They are a universal-fit aftermarket option – fit may vary on older or non-standard decks.

Key Things to Know

• Mulching only: These blades have a curved, high-lift design for mulching. They will not perform well for bagging or side-discharge.
• Installation: Straightforward bolt-on replacement. Use a torque wrench to tighten to 50-60 ft-lbs. No special tools required.
• Build quality: Caltric blades are made from heat-treated steel, but some users report they dull faster than OEM blades under heavy use.
• Balance: Check blade balance after installation – some sets may need minor balancing to avoid vibration.
• Price vs. OEM: At $34, they are roughly half the cost of OEM John Deere blades, but you sacrifice some durability.

Should You Buy It

Buy these if you have a 30" or 38" deck on an STX30/STX38 and want an affordable mulching-only blade for light-to-moderate use. Avoid them if you need bagging performance, have a 46" deck, or prefer OEM longevity for heavy commercial mowing.