Ariens 3PK Genuine OEM Gravely Blades for Zoom 50 ZT50 50" Deck fits 03746500, 03971900, 3971900, 3746500, 13177

What It Is

This is a set of three genuine OEM replacement blades designed for Ariens and Gravely Zoom 50" ZT50 zero-turn mowers. They are purpose-built for cutting grass on residential and commercial turf with a 50-inch cutting deck.

Fitment & Compatibility

Before buying, confirm your mower’s deck size is exactly 50 inches (not 48" or 52"). These blades fit Ariens Zoom 50 and Gravely ZT50 models with deck part numbers 03746500, 03971900, 3971900, and 3746500. They also replace Ariens/Gravely OEM part 13177. Check the blade length (should be approximately 18.5 inches center-to-center) and the center hole size (usually 7/8" diameter). These are not compatible with aftermarket universal blades—only genuine Ariens/Gravely decks. Verify your spindle pattern matches the three-blade setup (some 50" decks use two blades).

Key Things to Know

• Quality & durability: These are OEM, so steel thickness and heat treatment are matched to the factory specs. Expect longer life than most aftermarket blades.
• Installation difficulty: Easy—just a socket wrench and jack stands or ramps. Use a torque wrench to tighten spindle bolts to 50-60 ft-lbs. Always replace all three at once for even cutting.
• Common gotcha: Blade orientation matters. The lift wing should point upward toward the deck. Installing upside down will cause poor cut and vibration.
• Sharpening: Can be sharpened 2-3 times before replacement. Balance after each sharpening to avoid spindle wear.

Should You Buy It

If you own an Ariens Zoom 50 or Gravely ZT50 with a 50" deck and want guaranteed fit, consistent cut quality, and maximum blade life, this three-pack is the right choice. It’s priced competitively for OEM quality and has strong user feedback. For budget builds or non-OEM decks, consider aftermarket alternatives, but you’ll sacrifice durability and fitment certainty.