Husqvarna 577864603 Knife Carbon Extra Strong (Pack of 9) Blister Pack

What It Is

This is a pack of 9 extra-strong carbon steel replacement blades for Husqvarna robotic mowers. Designed for heavy-duty cutting in tall, dense, or tough grass, they’re a direct OEM upgrade over standard steel blades.

Fitment & Compatibility

• Deck size: Fits all Husqvarna Automower models with a standard blade disc (most models from 2010 onward, including 305, 315, 430X, 450X, and Ceora series).
• Check before buying: Verify your mower’s blade disc diameter (typically 20–30 cm) and that it uses the classic triangular blade shape. Measure the blade’s center hole diameter (usually 6.5 mm) and overall length (around 60 mm).
• OEM vs aftermarket: This is a genuine Husqvarna part (577864603) – not a third-party knockoff. Fits only Husqvarna robotic mowers, not other brands like Worx or Robomow.
• Pack contents: 9 blades in a blister pack; each blade is individually wrapped for storage.

Key Things to Know

• Installation difficulty: Very easy – snap old blades off the disc, push new ones on. No tools required. Replace all 3 blades at once (the pack covers 3 full disc swaps).
• Durability: “Extra strong” means thicker carbon steel than standard blades – lasts 2–3x longer in abrasive soil, sand, or rocky lawns.
• Common gotcha: If your mower has the older plastic disc, these thicker blades may cause slight vibration. Check disc condition – replace if cracked or warped.
• Performance: Cuts cleanly, but slightly louder than standard blades due to added stiffness. Not ideal for very fine, manicured lawns (can shred delicate grass tips).

Should You Buy It

Buy this if you have a Husqvarna robotic mower in a tough lawn (tall weeds, sandy soil, heavy thatch) and want fewer blade changes. Skip it if you only mow a clean, short lawn and prefer quieter operation – standard blades will be cheaper and quieter.