OEM vs Aftermarket Robotic Mower Blades — What's Actually Different?

A pack of three OEM Husqvarna blades retails around €12–€15. A pack of three quality aftermarket blades is €4–€6. People assume the OEM version must be using better steel — but the answer is more nuanced.

What's the same

• Shape and pivot geometry (they have to fit the same disc)
• Weight class (±0.05 g, otherwise the disc vibrates)
• Mounting hole — universally 4.2 mm for Husqvarna-pattern, 4.5 mm for Worx

What's actually different

1. Steel hardness

Genuine Husqvarna blades are typically 54–56 HRC (Rockwell hardness). Cheap no-brand blades drop to 48–50 HRC — softer, dulls in days. Quality aftermarket (Nordic Mow included) matches OEM at 54+ HRC.

2. Edge finish

OEM blades use a double-bevel grind. Lowest-tier knockoffs use a single bevel that loses its edge after the first heavy stick. Mid-tier aftermarket use double-bevel matching OEM.

3. Quality control

OEM weighs every blade. Cheap blades are picked from the batch. This matters because mismatched blade weights vibrate the cutting disc and wear the bearing inside the motor.

The bottom line

Pay attention to steel hardness (54+ HRC), double-bevel edge, and weight matching — those three specs are what separates a blade that lasts 4 weeks from one that lasts 4 days. The Husqvarna logo on top is the cheapest of those three to fake.

If a pack costs €1.50 for three blades, it isn't matching OEM on hardness. Real aftermarket lives between €4 and €7 per pack.