Husqvarna 21" 4-in-1 Lawn Mower Blade 580258102 — OEM Replacement, Balanced Hardened Steel

Genuine Husqvarna 580258102 21" 4-in-1 lawn mower blade — an OEM replacement blade engineered to restore cutting performance, mulching, side-discharge, and bagging function for compatible 21-inch decks.

Replace a dull or damaged blade with this factory-original Husqvarna part designed for 21-inch decks. Part number 580258102 is built to the same specifications as the original equipment, so it maintains blade balance, cutting geometry, and attachment fit for machines that call for this part. It’s compatible with multiple brands produced by Husqvarna’s manufacturing lines, including AYP, Craftsman, Jonsered, McCulloch, Poulan, Poulan Pro, RedMax, Sears, and Weed Eater—provided your mower’s model and serial number list this specific part number.

How will this blade change cutting performance?

Swapping to a sharp, correctly balanced OEM blade returns even, consistent cuts and reduces scalping or tearing. The 4-in-1 design is shaped to support multiple mowing modes—bagging, mulching, side discharge, and single-blade cutting—so you get cleaner clippings and improved yard appearance.

• Precision-manufactured edge for uniform grass shearing
• Balanced weight distribution to minimize vibration
• Design supports bagging, mulching, and side discharge
• OEM tolerances preserve deck clearance and blade-to-deck alignment

Will this fit my mower model?

Fit is determined by part number and your mower’s model/serial, not by visual similarity. This blade fits machines that specify Husqvarna part #580258102; it also fits some models from Husqvarna-manufactured brands listed above. Always verify compatibility against your mower’s owner’s manual or the model/serial plate.

• Check your mower’s parts list or owner’s manual for 580258102
• Compatible across selected Husqvarna-produced brands when the part number matches
• Not all 21" blades use the same center hole size—confirm before ordering

How do I install and maintain this blade?

Installation follows the manufacturer’s recommended procedure: disconnect spark plug, secure the mower, remove the old blade, and torque the new blade to the specified value. Routine maintenance keeps the blade cutting well—inspect for nicks, sharpen as needed, and replace if bent or cracked.

• Always disconnect spark plug before blade removal
• Use correct bolt and torque per your mower’s specs
• Sharpen periodically; replace if excessive wear or damage
• Balance after sharpening to avoid vibration

What materials and build quality can I expect?

This OEM blade is made from hardened steel and finished to resist corrosion and wear during normal use. Because it’s a factory part, machining, hole placement, and cutting geometry match original equipment tolerances to preserve mower balance and deck performance.

• Hardened steel construction for durable edge retention
• Factory-drilled center hole and mounting features for exact fit
• Finish improves rust resistance and longevity
• Engineered to OEM balance specifications

Who is this for: This replacement blade is aimed at homeowners, lawn care enthusiasts, and service technicians who need a direct OEM swap for a 21-inch mower deck that calls for part #580258102. Choose this blade if you want a genuine Husqvarna component that preserves your mower’s original cutting behavior and fits machines across several Husqvarna-manufactured brands—be sure to confirm compatibility by model and serial number before purchasing.