MTD 719-0329 Flail Blade 4-Pack

What It Is

This is a set of four OEM flail blades for MTD lawn tractors and zero-turn mowers equipped with a flail-style mowing deck. Flail blades use a series of Y- or T-shaped cutters attached to a rotating drum, designed for heavy-duty mulching, shredding leaves, and cutting tall or wet grass.

Fitment & Compatibility

Before buying, confirm your deck has a flail system—not a standard rotary blade. Check the blade’s mounting hole size (typically 5/16” or 3/8”) and ensure it matches your spindle. This part fits many MTD models with 38”, 42”, 46”, and 50” decks, but verify via your machine’s model number on the manufacturer’s site or parts diagram. It is OEM MTD, so it’s a direct replacement for original equipment; aftermarket equivalents may have slight dimension differences. Measure your current blade’s length (these are roughly 5.5” long) to confirm.

Key Things to Know

• Quality: OEM build with hardened steel—holds an edge longer than many aftermarket flails, but still dull faster than rotary blades due to impact cutting.
• Installation difficulty: Moderate. You’ll need a socket or wrench to remove the old blades and a torque wrench to tighten to spec (typically 30–40 ft-lbs). Wear gloves—edges are sharp.
• Common gotcha: Flail blades must be replaced in sets to maintain balance and cutting performance. Mixing old and new can cause vibration and uneven wear.
• Deck inspection: While replacing, check the drum bearings and belt for wear. A seized bearing can quickly ruin new blades.

Should You Buy It

This is the right choice if you need a direct OEM replacement for a worn-out flail set on an MTD tractor or ZTR with a flail deck. It’s overkill for a standard rotary mower—buy only if your deck is specifically designed for flails. At $111.60 for four blades, it’s a premium price, but the fit and durability justify it for heavy-use owners who want to avoid aftermarket trial-and-error.