Arnold 490-100-0111 16-Inch Detatching Replacement Mower Blade

What It Is

The Arnold 490-100-0111 is a 16-inch universal replacement cutting blade designed for detaching (removing the grass bagging system) on many walk-behind mowers. It’s intended as an aftermarket alternative to OEM blades for standard residential mowing.

Fitment & Compatibility

Before buying, check three things: deck size, blade measurement, and mounting pattern. This blade is 16 inches long (center hole to tip), so it fits mower decks that accept a 16-inch blade—common on many 20-22 inch deck mowers, but not all. Measure your old blade’s length and center hole diameter (typically 1 inch or 5/8 inch). The Arnold 490-100-0111 uses a standard 1-inch center hole. It’s a universal aftermarket blade, so it may not match OEM shapes or lift profiles exactly. Confirm compatibility with your mower brand and model by checking Arnold’s online fitment guide or your owner’s manual. Common fits include many MTD, Troy-Bilt, Cub Cadet, and Craftsman models, but always verify.

Key Things to Know

• Quality vs. OEM: Rated 4.1/5 stars. Users report it cuts well but may not last as long as OEM blades, especially on tough grass or debris. It’s a budget-friendly option.
• Installation: Easy to install with a socket or wrench. No special tools needed, but always disconnect the spark plug and wear gloves. Torque the blade bolt to manufacturer specs (typically 30-50 ft-lbs).
• Balance: Aftermarket blades may require balancing before use. Use a blade balancer—an unbalanced blade causes vibration and poor cut.
• Detaching use: Designed for mowing without the bagger (side discharge or mulching). Not intended for bagging—the lift shape is less aggressive.

Should You Buy It

Buy this blade if you need a cheap, widely compatible 16-inch replacement for basic detaching mowing and don’t mind slightly shorter lifespan than OEM. Skip it if you require exact OEM fit, high durability for heavy use, or a blade optimized for bagging or mulching.