587125201 Spindle Replaces Husqvarna 587125201 Mandrel Assembly, Husqvarna 532174356, 539107515, 532174358, Craftsman 174356, 174358 for Husqvarna Z246, RZ4623, RZ5424, RZ46I Lawn Tractors

What It Is

The 587125201 spindle (also called a mandrel assembly) is the rotating hub that drives your mower blade. It’s designed for residential/commercial zero-turn and lawn tractors, specifically Husqvarna and Craftsman models with 46–54 inch decks.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Fits 46-inch, 48-inch, and 54-inch decks on Husqvarna Z246, RZ4623, RZ5424, RZ46I, and compatible Craftsman models. Check your deck’s stamped model number.
• OEM cross-references: Replaces Husqvarna 587125201, 532174356, 539107515, 532174358, and Craftsman 174356, 174358. If your original part number isn’t listed, measure the spindle shaft diameter (typically 1 inch) and bolt pattern (3-bolt, 4-inch spacing).
• Physical check: Measure the overall spindle height (usually about 4.5 inches) and pulley bore size (commonly 0.625 or 0.75 inch). Aftermarket units may vary slightly—compare to your old spindle before installing.

Key Things to Know

• Quality: At $23.99, this is a budget-friendly aftermarket option. Expect basic steel construction; may not last as long as OEM on heavy commercial use, but fine for homeowner duty.
• Installation difficulty: Moderate. Requires removing the deck, belt, and pulley, then unbolting the old spindle. You’ll need a socket set, a puller for the pulley, and thread-locker on bolts.
• Common gotcha: The included bearings may be pre-greased but not sealed as well as OEM. Grease them before installation, and check for wobble after 10 hours of use.
• Return policy: Since fitment varies by deck revision, buy from a seller with easy returns. Measure twice, install once.

Should You Buy It

If you own a Husqvarna or Craftsman zero-turn or lawn tractor with a 46–54 inch deck and need a quick, affordable spindle replacement for residential mowing, this is a solid choice. Skip it if you’re running a commercial operation or need exact OEM tolerances—spend the extra $20–30 for a genuine Husqvarna unit.