BlueStars

What It Is

The BlueStars part is a replacement lawn mower blade, designed to fit most standard walk-behind mowers with a 21-inch cutting deck. It’s a universal aftermarket blade for routine blade swaps on gas or electric mowers.

Fitment & Compatibility

Before buying, measure your existing blade length—this BlueStars blade fits 21-inch decks specifically. Check the center hole diameter (usually 1-inch or 5/8-inch) and the blade’s thickness (typically 0.2 inches). It’s compatible with most Craftsman, Husqvarna, Toro, Troy-Bilt, and Murray models, but always verify your mower’s OEM blade part number against BlueStars’ fitment list. Avoid assuming it fits all 21-inch decks—some mowers require specific blade shapes or offsets.

Key Things to Know

• Quality is decent for the price, but some users report the blade is slightly thinner or lighter than OEM—fine for light-duty mowing, less ideal for thick or wet grass.
• Installation is straightforward: remove the spark plug wire, tilt the mower, use a socket wrench to swap the blade, and tighten to manufacturer torque specs (usually 30-50 ft-lbs).
• Common gotcha: the blade may need balancing before first use—use a blade balancer or check by hanging it on a nail to avoid vibration.
• Aftermarket blades like this often don’t include a bolt or washer kit, so reuse your old hardware or buy separately.

Should You Buy It

This is a solid budget pick for homeowners with a common 21-inch mower who need a quick, cheap replacement for normal cutting. Skip it if you mow heavy-duty turf, want OEM longevity, or need a specific blade shape for mulching or bagging.