8TEN LawnRAZOR Mower Blade for Ariens 34 inch Decks Zoom Zero Turn Mowers 03971900 (Notched Medium Lift) 4 Pack

What It Is

The 8TEN LawnRAZOR mower blade is a notched, medium-lift blade designed for Ariens Zoom zero-turn mowers with 34-inch decks. It replaces OEM part 03971900 and is sold as a 4-pack, intended for users who need a balance of cutting performance and bagging efficiency on residential or light commercial properties.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: This blade fits only Ariens 34-inch Zoom decks (e.g., models ZT, ZX, and similar). It will not fit 36-inch, 42-inch, or other deck widths.
• OEM cross-reference: Confirmed replacement for Ariens part number 03971900. Check your owner’s manual or current blade for this number.
• Measurements: Blade length is 17.5 inches, center hole is 5/8-inch round, and the notch (gullet) depth is 1.25 inches. Measure your old blade’s length and hole size to be sure—if your deck uses a different hole shape or length, this won’t work.

Key Things to Know

• Quality vs. OEM: These are aftermarket blades, not Ariens OEM. They’re heat-treated steel with a painted finish; some users report they dull slightly faster than OEM but cost significantly less.
• Installation difficulty: Easy—remove the old blade, note the orientation (notch should face upward toward the deck), and torque to 70–80 ft-lbs. Use a blade removal tool for safety.
• Common gotcha: The “medium lift” design is good for mulching and bagging, but if you primarily side-discharge on thick grass, you may get less airflow than a high-lift blade. Also, the 4-pack means you’ll have a spare set; store extras dry to prevent rust.
• Balance: Check blade balance after sharpening using a blade balancer—unbalanced blades cause vibration and deck wear.

Should You Buy It

If you own an Ariens 34-inch Zoom zero-turn and want a budget-friendly 4-pack of replacement blades that offer decent cutting and bagging performance for regular residential mowing, this is a solid choice. Skip it if you need OEM durability for commercial daily use or if your deck requires a different blade length or hole shape.