3 Pack Blade Bolt Fits Kubota Mowers K5651-34372 K5651-34370 ZD321 ZD326S

What It Is

This is a 3-pack of replacement blade bolts designed for Kubota ZD-series zero-turn mowers, specifically to secure the mower blades to the spindle assembly. Each bolt matches OEM part numbers K5651-34372 and K5651-34370.

Fitment & Compatibility

Before buying, verify your mower model and deck size. These bolts fit Kubota ZD321 and ZD326S models with 60-inch or 72-inch decks. Measure your existing bolt: these are 3/8-inch diameter, 1.5 inches long, with a 5/8-inch hex head. They are aftermarket replacements for OEM Kubota bolts—check that your current bolts match these dimensions. Not compatible with ZD331 or other Kubota series without cross-referencing the part numbers.

Key Things to Know

• Quality: Made from hardened steel to handle high torque; reviews indicate they hold up well under normal use, but some report slight variance in thread finish compared to OEM.
• Installation: Straightforward—use a torque wrench to 50-60 ft-lbs. Over-tightening can strip threads; under-tightening risks blade detachment.
• Gotcha: The 3-pack covers a single spindle set (one bolt per blade). If your deck has three blades, you need exactly one pack. For two-blade decks, you’ll have a spare.
• Gotcha: Always apply anti-seize compound to prevent corrosion and seizing in the spindle, especially if you mow in wet or humid conditions.

Should You Buy It

Buy this if you own a Kubota ZD321 or ZD326S and need a cost-effective, reliable replacement for worn or lost blade bolts. It’s a good value for the price, but if you prefer exact OEM fitment or have a different Kubota model, stick with genuine Kubota parts to avoid thread issues.