(2PCS) UC22008 Lawn Mower Blades - Replace OEM John Deere M170642 - Fits X330 X350 X354 X370 Z335E Z335M Z345M Z345R - for 42 Inch Deck Lawn Mower

What It Is

This is a set of two aftermarket 42-inch deck lawn mower blades designed to replace OEM John Deere part M170642. They are intended for residential mowing on John Deere X300 and Z300 series tractors and zero-turn mowers, as well as select Z500 series models.

Fitment & Compatibility

Before buying, verify three things:

1. Deck size: These blades only fit a 42-inch deck. Measure your deck width if unsure.
2. Model match: Confirmed fit for John Deere X330, X350, X354, X370, Z335E, Z335M, Z345M, Z345R. Also fits Z530M and Z535M with 42-inch decks. Do not assume they fit other X300 or Z500 series mowers without checking your deck.
3. OEM cross-reference: Replaces John Deere part numbers M170642, M155244, M160825, and UC22008. If your current blade has a different OEM number, measure center hole diameter (must be 15/16-inch) and overall length (should be 21.5 inches). These are standard for 42-inch Deere decks.

Key Things to Know

• Material: Made of 10-gauge steel with a hardened edge; durable for residential use but not designed for commercial or heavy-duty conditions.
• Installation: Straightforward—remove the single center bolt per blade. Torque to 70–90 ft-lbs. No special tools needed.
• Common gotcha: These blades are not mulching blades; they are standard 2-in-1 (bag/discharge) design. If you need mulching, look for a dedicated mulching blade set.
• Balance: Each blade is pre-balanced from the factory, but check with a blade balancer after installation for safety.

Should You Buy It

If you own a compatible John Deere 42-inch deck model and need a solid, budget-friendly replacement for standard cutting, this set is a good value. It matches OEM specs, has strong reviews, and costs less than dealer blades. Skip it if you need mulching blades or have a 48- or 54-inch deck.