04265400 Mower Blades Compatible with Gravely 42" ZT Zero Turn Mower Decks, Fit for A riens Zoom 915159 915171, Replace 1134-9210-01, 3 Pack

What It Is

This is a 3-pack of 18.5-inch mower blades designed for 42-inch Gravely ZT Zero Turn decks and compatible with select Ariens Zoom models. They replace OEM part 1134-9210-01 and are intended for medium-duty residential mowing.

Fitment & Compatibility

Before buying, verify your deck is exactly 42 inches and that your mower is one of these models: Gravely ZT 42, ZT HD 42, or ZT X 42. Also fits Ariens Zoom 915159 and 915171. Measure your current blade length—must be 18.5 inches from tip to tip. Check the center hole diameter (typically 7/8-inch) and the oval drive hole pattern. Aftermarket blades may have slightly different steel thickness or coating compared to OEM Gravely blades, so compare the mounting hole alignment closely. Not for 48-inch or 54-inch decks.

Key Things to Know

• Quality: At $31.99 for three, these are budget-friendly. Expect adequate sharpness out of the box but may dull faster than OEM or premium aftermarket blades.
• Installation: Straightforward swap using a socket wrench and blade removal tool. Torque to 70-90 ft-lbs. No special adapters needed.
• Gotcha: Double-check the blade orientation—the lift wings must face up toward the deck. Some users report needing to balance these blades before first use to avoid vibration.
• Durability: Fine for 1-2 acres of normal grass. Avoid heavy mulching or thick wet grass to extend edge life.

Should You Buy It

Buy this set if you have a 42-inch Gravely ZT or compatible Ariens Zoom, want a low-cost replacement for routine blade changes, and are comfortable with minor prep like balancing. Skip it if you need heavy-duty mulching, longer-lasting edge retention, or guaranteed OEM fit—invest in Gravely-branded blades instead.