8TEN LawnRAZOR Blade for John Deere JS20 JS30 JS35 JS25 JS45 JS40 21" Walk Behind Mower GX22250 (Mulching)

What It Is

The 8TEN LawnRAZOR Blade is an aftermarket mulching blade designed for John Deere 21-inch walk-behind mowers in the JS20, JS30, JS35, JS25, JS45, and JS40 series. It replaces OEM part GX22250, optimized for fine grass clipping shredding rather than bagging or side-discharge.

Fitment & Compatibility

Before buying, measure your existing blade: the LawnRAZOR requires a 21-inch deck, a 3.25-inch center hole, a 0.50-inch center hole diameter, and a 0.16-inch blade thickness. It fits John Deere JS20, JS30, JS35, JS25, JS45, and JS40 models only—not other JD series. Cross-check your model number (e.g., JS35) on the deck sticker or manual. This is an aftermarket part, not OEM, so verify your blade’s length (21 inches) and mounting pattern match. If your mower uses a different OEM blade number (like GX22251), this won’t work.

Key Things to Know

• Mulching-only use: This blade lacks a high-lift wing for bagging; expect clumping or poor discharge if used for side discharge.
• Installation difficulty: Easy for DIYers—just a single bolt, but use a torque wrench to 40-50 ft-lbs. Don’t overtighten.
• Durability: Heat-treated steel holds up well against rocks and roots, but avoid hitting large debris to prevent bending.
• Balance check: Out of the box, it may need balancing. Use a blade balancer tool before mounting to avoid vibration.

Should You Buy It

If you own a compatible John Deere JS-series 21-inch walk-behind and primarily mulch grass clippings, this is a solid, affordable upgrade over worn OEM blades. It’s sharp, durable, and well-rated, but skip it if you need bagging or side-discharge performance.