438-0004-00 Mower Blades for Spartan 48 inch Deck, 16.54" Replacement for Spartan, Medium Lift Blades with 0.622" Circle Center Hole, Fits RZ and RZ HD Models

What It Is

This is a set of three medium-lift mower blades designed specifically for Spartan 48-inch zero-turn mowers. They are a direct replacement for OEM blades on RZ and RZ HD models, intended for residential and commercial grass cutting with standard bagging or side discharge.

Fitment & Compatibility

Before buying, verify these three points:

• Deck size: Must be a 48-inch Spartan deck. These blades are 16.54 inches long (three blades cover 48 inches).
• Center hole: 0.622-inch circle hole. Measure your existing blade’s center hole—most Spartan OEM blades use this size, but some aftermarket spindles may differ.
• Model check: Fits Spartan RZ and RZ HD series. Does not fit MZ, MR, or other non-RZ Spartan models. If you have a different brand (e.g., Husqvarna, Bad Boy), these will not fit without modification.

OEM cross-reference: Spartan part number 438-0004-00. These are aftermarket replacements, not OEM Spartan parts.

Key Things to Know

• Medium lift – good for general mowing with bagging or discharge, but not ideal for heavy mulching or wet, thick grass. Low lift would be better for longer grass.
• Installation difficulty: Easy (wrench, jack/ramp, safety glasses). Torque blade bolts to 70–80 ft-lbs. Check blade balance after installation—aftermarket blades sometimes need light filing to balance.
• Durability: Made from hardened steel, but not as thick as some OEM blades. Expect 1–2 seasons of residential use before sharpening or replacement.
• Common gotcha: The 0.622-inch center hole is slightly larger than some OEM hubs (0.625-inch). This can cause wobble if the spindle is worn. Check for play after tightening.

Should You Buy It

If you own a Spartan RZ or RZ HD with a 48-inch deck and want a budget-friendly, drop-in replacement that works well for regular mowing, this blade set is a solid choice. Skip it if you need heavy-duty mulching or have a different brand/model.