UC22008 High Lift Mower Blades Kit Compatible with 42" Deck John Dee-re X350 X330 X350R Z315E Z320M Z320R S220 S240 Lawn Mowers，Replace M170642, 2 Pack

What It Is

This is a 2-pack of high-lift mower blades designed to replace OEM part M170642 on select John Deere lawn tractors and zero-turn mowers with a 42-inch cutting deck. High-lift blades create stronger upward airflow, improving grass clipping discharge and bagging performance, especially in thick or tall grass.

Fitment & Compatibility

Before buying, confirm your mower has a 42-inch stamped deck (not a 42-inch fabricated deck). Compatible models include: X330, X350, X350R, Z315E, Z320M, Z320R, S220, S240. Also fits some older 42" Deere decks on L100/L110/L120/L130 series (check your deck part number). Critical measurements: blade length = 21 inches, center hole = 7/8-inch hex, blade thickness = 0.203 inches. These are aftermarket replacements for OEM part M170642. They will not fit 42" decks from other brands (e.g., Craftsman, Husqvarna) without verifying measurements.

Key Things to Know

• Installation difficulty: Easy – requires a socket wrench and possibly a blade removal tool. Torque bolts to 40-50 ft-lbs.
• Lift vs. standard: High-lift blades increase suction but also put more strain on the engine and deck belt. Avoid using them if you primarily mulch or mow in dusty conditions – they’ll kick up more debris.
• Balance check: Always balance new blades before installing. Even slight imbalance causes vibration and bearing wear.
• OEM vs. aftermarket: These are slightly cheaper than genuine Deere blades ($40-50/pair) but use hardened steel similar to OEM. Reviews are limited (3 reviews), so verify fitment carefully.

Should You Buy It

If you own a compatible 42" Deere deck and want improved bagging or side-discharge performance in heavy grass, this kit is a solid, budget-friendly upgrade. Skip it if you mulch or mow in dry, dusty conditions – standard lift blades will be smoother and more efficient.