Mower Blades M170642 for John Deere 42-Inch Deck

Overview

These aftermarket Mower Blades M170642 for John Deere 42-Inch Deck are replacement mulching mower blades for select John Deere mower deck applications using the listed replacement blade number path.

Use this listing when your original blade number matches M170642 / S220 / S240 / X330 or another replacement number listed below, and your deck uses the same blade length, center-hole style, blade count, deck size, and blade layout.

Key Features

• Aftermarket mower blade set for select mower deck applications
• Available pack quantities: 2-Pack
• Replacement path: M170642 / S220 / S240 / X330 / Z315 / 350R / X350 / X354
• Common deck size: 42 inch
• Blade style: Mulching
• Use the original blade number and physical measurements to confirm fitment

Compatible Brands & Model Series

This blade set is used on select John Deere mower deck applications with 42 inch decks.

Source fitment examples:

• John Deere: S220 200 Series Tractor 42-inch deck
• John Deere: S240 Sport Lawn Tractor (880001 - ) 42-inch deck
• John Deere: Lawn and Garden Tractor 42-inch deck
• John Deere: X330, X350, X350R, X354X370, X380ZTrak Mower 42-inch deck
• John Deere: Z315E, Z320R, Z335EZ335M, Z345M, Z345R

Fitment note: Model names, deck sizes, and serial ranges are provided as fitment clues. Match the original blade number, blade length, center-hole style, blade count, deck size, and mower model before ordering.

Replaces OEM Part Numbers

• M170642
• S220
• S240
• X330
• Z315
• 350R
• X350
• X354
• X370
• X380
• Z315E
• Z320R
• Z335
• Z345

Blade Specifications

• Blade thickness: 0.2 inch
• Common deck size: 42 inch
• Blade type: Mulching

Common Symptoms of Worn Mower Blades

• Uneven cut quality
• Grass tearing instead of cutting cleanly
• Visible blade wear, cracks, bends, or rounded cutting edges
• Deck vibration from bent or unbalanced blades

Quick Ship Fulfillment

This item may ship directly from one of our trusted U.S. distribution partners to help reduce transit time. Packaging, labeling, or warehouse origin may vary, but the part will match the replacement numbers, fitment notes, and specifications shown in this listing.

Why Buy From PTO Direct USA

• Focused replacement parts for mower deck and PTO repair
• Part-number-first listings to help reduce fitment mistakes
• Clear replacement numbers and fitment notes before you order
• Fast, practical support if you need help checking compatibility

Need Help Confirming Fitment?

If you are not sure whether this blade set fits your mower, send us your mower model number, deck size, and the part numbers from your original blades. We can help you compare them before you order.

FAQ

Will this fit all 42 inch decks?

No. This blade set fits select applications only. Match your original blade number, blade length, center-hole style, deck layout, and mower model before ordering.

Which package quantity should I choose?

Choose the pack quantity that matches your deck blade count and the number of complete blade changes you want to keep on hand.

What should I check before installing?

Compare blade length, center-hole pattern, lift style, deck layout, and original blade number against your mower or OEM diagram. Stop installation if the blades do not match your original setup.