6PK Lawn Mower Blades Replacement for Kubota K5647-34330 K5647-34340 60" ZD326S ZD21F-60P

What It Is

This is a set of six aftermarket lawn mower blades designed to replace OEM Kubota part numbers K5647-34330 and K5647-34340. They fit 60-inch mower decks on Kubota ZD326S and ZD21F-60P zero-turn mowers, used for cutting grass on commercial or large residential properties.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Your mower must have a 60-inch cutting deck. These blades are not compatible with 48-inch or 72-inch decks.
• Model number: Confirmed fit for Kubota ZD326S and ZD21F-60P. Check your machine’s serial plate under the seat or on the frame for exact model. Not guaranteed for other Kubota ZD series models.
• Blade measurements: Each blade is 20.5 inches long, with a 1-inch center hole and 0.25-inch thickness. Measure your current blade length and hole diameter to confirm. OEM equivalents are Kubota K5647-34330 (left) and K5647-34340 (right) – this set includes both.

Key Things to Know

• Quality vs OEM: These aftermarket blades are generally comparable to OEM in thickness and material, but some users report slightly faster dulling. Inspect after 10 hours of use.
• Installation difficulty: Moderate. You’ll need a 9/16-inch socket and a torque wrench (spec: 80-100 ft-lbs). Use threadlocker on blade bolts to prevent loosening. Always disconnect the spark plug first.
• Common gotcha: Blades may be slightly heavier than OEM, which can affect spindle bearing wear over time. Check for balance before installing – if one side is heavier, it can cause vibration and poor cut.
• Lift and cut: These are standard lift blades, not mulching or high-lift. Best for bagging or side-discharge. Avoid for fine mulching.

Should You Buy It

This set is a solid value if you need a full 6-blade replacement for a Kubota 60-inch ZD deck and want to save roughly 30% over OEM. It’s best for commercial users who replace blades frequently and don’t need premium edge retention. If you’re a homeowner using a ZD326S for a few acres, it’s a fine choice, but expect to sharpen more often than with OEM. Not recommended if you require exact OEM balance or run in heavy, wet grass regularly.