ZALANA Mulching Blades for John Deere 42" Deck — M170642/UC22008 Compatible (2-Pack), Heavy‑Duty Stamped Steel

ZALANA M170642 mulching blades are heavy-duty replacement blades designed to retrofit 42-inch John Deere riding mowers and Z-Trak zero-turn models so you can restore cutting performance and produce finer clippings.

If your mower’s cutting quality has diminished or the original blades are bent, dull, or missing, these two ZALANA blades match the M170642/UC22008 OEM profile and the 42" deck footprint. They’re built from thick stamped steel with a reinforced profile for mulching, helping grass clippings recut and disperse evenly when installed correctly. The set includes two blades sized for many common John Deere X and Z series machines.

Which John Deere machines will these blades fit?

These blades are created to be compatible with multiple 42-inch John Deere models. They follow the OEM hole pattern and overall dimensions so they mount where the factory blades attach. Always compare your mower’s blade measurements before buying to ensure proper fit.

• Compatible with 42" decks on X330, X350, X354, X370, X380 riding mowers
• Compatible with 42" Z-Trak models Z335E, Z335M, Z345M, Z345R
• Center mounting hole and overall length match M170642/UC22008 specifications

How do these blades improve mulching and cutting?

The blades’ shape and edge geometry are optimized to create an updraft and multiple cutting passes, which helps shred clippings into smaller pieces. Smaller clippings decompose faster and spread more uniformly across the lawn, improving appearance without changing mowing technique.

• Mulching profile encourages repeated recutting of clippings
• Stamped-steel construction retains edge longer than thin aftermarket blades
• Balanced length and width maintain deck airflow for even discharge

What are the exact dimensions and material details?

Each blade in the pair follows precise measurements so installation and performance match the original equipment. The blades use heavier-gauge metal to resist bending and tolerate repeated sharpening, extending service life under normal use.

• Overall length: 21-3/8" (approx.)
• Width: 2-3/4"; thickness: 0.197" for added durability
• Center mounting hole: 51/64" to align with factory spindles

How do I install and maintain these replacement blades safely?

Installation follows the standard blade-replacement steps—park on level ground, disconnect the spark plug, and use appropriate tools to remove and replace blades. Regularly check blade bolts for torque and inspect edges; sharpening keeps cut quality high while damaged blades should be replaced without delay.

• Always disconnect spark plug and wear gloves when handling blades
• Torque blade bolts to manufacturer specifications after mounting
• Sharpen edges periodically and replace if bent, cracked, or excessively worn

Who this is for: These ZALANA M170642 mulching blades suit owners of 42" John Deere X and Z series mowers who want an OEM-style replacement without sourcing factory parts. They’re a practical option for homeowners and groundskeepers aiming to restore cutting performance, improve clipping dispersion, and extend the usable life of their deck with a thicker, more durable aftermarket blade set.