M170642 Mulching Blades Compatible with Jo-hn Deere X330 X350 X354 X370 X380 Z335M Z345M Z345R Z335E Blades Riding 42 Inch Mower Deck, Replaces for UC22008 (2 Pack)

What It Is

This is a set of two mulching blades designed for 42-inch riding mower decks, specifically for select John Deere X300-series lawn tractors and Z300-series zero-turn mowers. They chop clippings finely to return nutrients to the lawn, eliminating the need for bagging.

Fitment & Compatibility

Before buying, verify three things:

1. Deck size: These blades fit only 42-inch mower decks. Measure your deck cutting width to confirm.
2. Model compatibility: Fits John Deere X330, X350, X354, X370, X380, Z335M, Z345M, Z345R, and Z335E. Also fits older models like X300, X304, X320, X324 (check your deck size).
3. OEM cross-reference: Replaces John Deere part UC22008. Aftermarket blade; not OEM. Measure your existing blade length (likely 16.5 inches), center hole diameter (usually 1 inch), and offset/dish depth (typically about 0.5 inches) to confirm physical match.

Key Things to Know

• Mulching vs. standard blades: These have more curve and lift to recirculate clippings. They require mowing at a slower pace and with dry grass for best results.
• Installation: Straightforward on most models—remove the old blade, note orientation, torque to 45-55 ft-lbs. Use a blade removal tool to avoid slipping.
• Quality: Aftermarket blades may be slightly thinner or less balanced than OEM. Inspect for warping or dull edges before mounting. Balance them with a blade balancer.
• Common gotcha: These blades are not universal. They will not fit 48-inch or 54-inch decks, nor older John Deere models with different spindle bolt patterns.

Should You Buy It

If you own one of the listed John Deere models with a 42-inch deck and want a budget-friendly mulching option, this two-pack is a solid value. It works well for homeowners who mow weekly and prioritize a clean, mulched finish. For heavy-duty commercial use or if you prefer OEM precision, stick with the genuine UC22008.