Stens 325-735 Cub Cadet 759-3830 Mulching Blade,Black

What It Is

This is a 21-inch mulching blade designed to replace OEM Cub Cadet part 759-3830 (and Stens 325-735). It’s intended for use on Cub Cadet riding mowers and zero-turn mowers with 42-inch, 46-inch, or 50-inch decks that require a 21-inch blade—typically for fine grass clipping mulching rather than bagging or side discharge.

Fitment & Compatibility

Before buying, check three things:

• Blade length: Must be exactly 21 inches (center hole to cutting tip). Measure your old blade or confirm your deck model.
• Mounting hole pattern: This blade uses a 5-point star center hole (5/8-inch center hole with 5-point star shape). It will not fit round-hole or 4-point star spindles.
• Deck & model: Fits Cub Cadet LT, RZT, Z-Force, and XT series with 42", 46", or 50" decks. Also compatible with some MTD/Craftsman models using the same star pattern. Verify your OEM part number is 759-3830 or cross-reference with Stens 325-735.
• Other brands: Will fit select Husqvarna, Troy-Bilt, and John Deere models that use the same 21-inch star-pattern blade—but always measure first.

Key Things to Know

• Quality: Medium-carbon steel with a black powder coat. Good durability for residential use, but not as hard as OEM or high-end aftermarket blades for heavy commercial cutting.
• Installation: Easy bolt-on replacement—no special tools beyond a socket wrench and blade removal tool (or block of wood to stop the blade). Torque spindle bolts to 70–90 ft-lbs.
• Gotcha: This is a mulching blade only—it has a higher lift and curved design to recut clippings. Do not use it for bagging or side discharge; it will leave clumps.
• Sharpening: Can be sharpened at home with a file or grinder, but the coating will wear off quickly. Replace when nicked or worn beyond 1/8-inch edge loss.

Should You Buy It

If you own a Cub Cadet with a 42–50-inch deck and a star-pattern spindle, and you primarily mulch grass, this is a solid, budget-friendly replacement. It’s not for heavy commercial use or for those who bag or side-discharge—but for residential mulching, it performs well and matches OEM specs.