(3 Pack) 355-101 20" Lawn Mower Blades, Replace for 2105300125A Lawn Mower Blades 20" Length, 1/8" Thickness, 2-1/4" Width, 1" x 3/4" Center Hole, Compatible with Hyper Tough Deck Lawn Mower

What It Is

This is a 3-pack of 20-inch replacement blades for walk-behind lawn mowers with 20" cutting decks. Designed as a direct replacement for OEM part 2105300125A, they are specifically marketed for Hyper Tough brand mowers but may fit other brands with the same spindle hole pattern.

Fitment & Compatibility

Before buying, verify these three things:

• Deck size: Your mower must have a 20-inch cutting deck. Measure from blade tip to blade tip if unsure.
• Center hole: The hole is 1" x 3/4" (oblong). This fits spindles with a 1" round shaft and a 3/4" flat side. Measure your current blade’s center hole; if it’s round-only or a different size, these won’t fit.
• Blade dimensions: Length 20", width 2-1/4", thickness 1/8". Compare to your old blade. Thinner or narrower blades can reduce cutting performance and may not clear the deck.

These are aftermarket, not OEM. They are confirmed compatible with Hyper Tough models using the 2105300125A blade. For other brands (e.g., MTD, Yard Machines, Craftsman) with the same hole pattern, measure first.

Key Things to Know

• Quality: At $44.99 for three blades (~$15 each), they are priced competitively. The 1/8" thickness is standard for residential mowers but may wear faster than thicker (3/16") commercial blades.
• Installation: Easy for anyone comfortable with a socket wrench. Use a blade removal tool or wedge a block of wood against the blade to prevent spinning. Torque bolts to 30-40 ft-lb.
• Common gotcha: The oblong hole orientation matters. The 1" side aligns with the spindle shaft; the 3/4" flat side must match the spindle’s flat edge. Install wrong and the blade will wobble or loosen.
• Balance: Aftermarket blades may not be pre-balanced. Check balance on a blade balancer before installing to avoid vibration and spindle wear.

Should You Buy It

Buy these if you have a Hyper Tough 20" mower and want a cost-effective 3-pack for multiple seasons of replacement without paying OEM prices. Skip them if your mower uses a different hole pattern, a thicker blade, or if you need commercial-grade durability—these are built for light to medium residential use.