UC22008 Mower Blade Compatible with John Dee re 42" Mower Deck, Fit for John Dee re X350 X354 X370 Z335E Z335M Z345M Z345R, Replace M170642, 2 Pack

What It Is

The UC22008 is a 2-pack of replacement mower blades designed for 42-inch John Dee re lawn tractor and zero-turn mower decks. These blades are for cutting grass on residential or commercial turf, replacing OEM part M170642.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch deck (not 48 or 54 inch). UC22008 fits select John Dee re X300 series (X350, X354, X370) and Z300 series zero-turns (Z335E, Z335M, Z345M, Z345R). Not compatible with X500, X700, or Z900 series. Measure your existing blade: length 21 inches, width 2.5 inches, center hole 7/8-inch diameter, and 5-point star pattern. If your OEM blade number is M170642, it’s a direct swap. Always check deck underside for deck model stamp or measure blade length to avoid mismatch.

Key Things to Buy

• Quality: Aftermarket steel, typically lighter than OEM; may wear faster on sandy soil or frequent use. Rated 4.4/5, but some report balance issues—check with a blade balancer before install.
• Installation: Easy with a socket wrench and torque wrench (recommended 70-90 ft-lbs). Use thread locker on bolts. Ensure blade orientation (cutting edge faces rotation direction).
• Common Gotchas: These blades may not fit decks with offset spindle positions—verify bolt pattern matches your mower’s star drive. Some users note they are slightly thinner than OEM, reducing lift in wet grass.
• Compatibility Check: If your deck has a different bolt pattern (e.g., 6-point star or oval hole), skip this set.

Should You Buy It

Buy the UC22008 if you need a budget-friendly 2-pack for a 42-inch John Dee re X350, X354, X370, or Z300 series mower and your OEM blade is M170642. It’s a solid value for residential mowing on medium turf, but skip if you demand OEM durability or have a different deck size.