34" 50" Deck Mower Blades Fit for Ariens Zoom 34 Zoom 50 Zero Turn Mowers Replaces OEM 03971900 (Notched Medium Lift) 2 Pack

What It Is

This is a 2-pack of notched medium-lift mower blades designed for 34-inch and 50-inch decks on Ariens Zoom 34 and Zoom 50 zero-turn mowers. They replace OEM part 03971900 and are intended for cutting grass with efficient airflow for bagging or side discharge.

Fitment & Compatibility

Before buying, confirm your deck size is exactly 34" or 50" (measure from blade tip to blade tip across the deck). These fit Ariens Zoom 34 and Zoom 50 zero-turn models only—not other Ariens series or brands. Verify your current blade’s center hole is round (not oval) and the notch pattern matches the spindle. Measure your existing blade length: 34" decks use ~17-inch blades; 50" decks use ~20-inch blades. Check that the blade thickness is similar to OEM (usually ~0.25 inches). If your spindle uses a different bolt pattern or offset, these won’t fit.

Key Things to Know

• Quality: Aftermarket blades at a budget price; 5-star rating based on 1 review, so durability and balance are unproven long-term.
• Installation: Medium difficulty—requires lifting the mower, removing the bolt (likely 5/8" or 15/16" socket), and torquing to spec (~70-90 ft-lbs). Use a blade lock or block the deck.
• Common gotcha: Notched blades are for specific spindle designs; if your OEM blade is solid (no notch), these won’t mount correctly. Check the notch depth and alignment before tightening.
• Performance: Medium lift is a compromise—good for most grass types but may struggle in wet, thick grass compared to high-lift blades.

Should You Buy It

Buy these if you have an Ariens Zoom 34 or Zoom 50 with a notched spindle and want an affordable replacement for basic residential mowing. Skip them if you need commercial-grade durability, a different lift type (e.g., high-lift for mulching), or if your deck uses a different blade pattern.