JYLEYJ 42" Mulching Blades for John Deere 42" Deck — 2-Pack Rolled-Mulch, Heat-Treated Steel

These JYLEYJ 42" mulching blades are a two-blade replacement set engineered to restore mulching performance for John Deere 42" decks, matching OEM fit and cutting geometry.

Swapping worn blades for the correct replacement restores cut quality, mulch dispersion and bagging performance on zero-turn and lawn tractor models. This 2-pack from JYLEYJ is sized to fit John Deere 42" mower decks used on a range of X- and Z-series machines, and it follows the OEM bolt pattern and rolled-mulch profile to keep airflow and grass clippings consistent.

Will these blades fit my John Deere model?

Yes — these blades are manufactured to replace OEM part numbers UC22008, M170642, M170639 and GY20683 and are sized for 42" decks. They fit multiple John Deere machines that use the same 42" deck mounting and center hole spacing.

• Compatible models: X330, X350, X354, X370, X380, Z335E, Z335M, Z345M, Z345R and S220 when equipped with a 42" deck
• Blade length: 21 3/8" (21.375") for correct deck clearance
• Center hole circle diameter: 13/16" (0.803") for proper hub alignment

How do these blades affect mowing performance?

The rolled mulching profile improves clipping circulation under the deck so grass is cut multiple times and discharged finer, which promotes faster decay. Properly shaped blades help preserve airflow for consistent cutting height across the deck.

• Rolled-mulch design encourages finer clipping reduction
• Durable edge retention keeps cuts cleaner between sharpenings
• Balanced geometry reduces vibration and protects spindles

What are the physical specifications and materials?

Each blade in this JYLEYJ set is produced from high-quality steel with dimensions matching OEM expectations to ensure safe, lasting use. Thickness and width are specified to maintain rigidity while allowing proper lift and mulching action.

• Length: 21.375 inches; Width: 2.756 inches; Thickness: 0.197 inches
• Center hole circle: 0.803 inches to match original mounting hardware
• Construction: heat-treated steel for durability and wear resistance

How easy is installation and what after-sales support is offered?

Installation follows standard blade change procedures: remove old blades, verify blade orientation, and torque mounting hardware to factory specs. JYLEYJ backs the product with customer support and a warranty so you can replace blades confidently.

• Comes as a 2-pack to replace both left and right blades on a 42" deck
• Easy drop-in fit for matching OEM bolt pattern and hole spacing
• 24-month after-sales warranty and customer support within 24 hours

Who is this for? Landscapers, homeowners with large lawns and service technicians who operate John Deere lawn tractors and zero-turn mowers that use 42" decks will benefit most from this JYLEYJ blade set. If your machine lists any of the compatible part numbers or models and you want to restore mulching efficiency, this OEM-matched 2-pack provides a direct, economical replacement engineered to meet factory-fit dimensions and performance expectations.