Arnold Walk-Behind Lawn Mower Replacement Blade 21–22 in (490-100-0083) High-Carbon Mulch/Dethatch

Arnold 490-100-0083 is a universal replacement blade for 21-, 22- and some 23-inch walk-behind lawn mowers that cuts, mulches, dethatches and helps you finish mowing faster.

This single high-carbon steel blade is designed to replace worn or damaged blades on a wide range of consumer walk-behind mowers. It arrives with removable sizers to match common spindle center holes and features adjustable nylon lines that turn the blade into a multifunction tool for cutting, raking and mulching. The blade’s sharpened edge and robust profile aim to restore a cleaner cut and more efficient grass flow through the deck, which can reduce clumping and the number of passes you need during routine mowing.

Which mowers will this Arnold blade fit?

The 490-100-0083 blade is made to work with many 21-, 22- and some 23-inch consumer walk-behind models. It’s not universal for every brand, but the included hole adapters increase compatibility with common spindle sizes found on popular makes.

• Fits many Troy-Bilt, Bolens, AYP and Craftsman walk-behinds
• Also compatible with select Honda, Husqvarna, Murray and Toro models
• Includes sizers for 3/8 in., 7/16 in., and 5/8 in. spindle centers
• Confirm by matching blade length and spindle hole pattern to your mower manual

How does this blade improve cutting and lawn appearance?

The blade’s sharpened cutting lip slices grass cleanly rather than tearing, producing a neater finish and healthier-looking turf. Better airflow and material flow through the deck reduce striping and clumping, helping you finish a job faster and with fewer passes.

• Sharp edge for cleaner, more uniform cuts
• Deck flow design helps move clippings to bag or mulch chamber
• Reduces time spent re-cutting or re-raking clumped grass
• Balancing and profile reduce vibration for steadier mowing

What multifunction features does the blade offer?

This Arnold blade includes replaceable nylon lines and a profile that let it perform more than simple cutting. With small adjustments you can switch between mulching, light dethatching, raking and bagging modes, making it versatile for seasonal yard maintenance.

• Nylon line attachments for dethatching and light scarifying
• Profile supports mulching when reinstalled in the mulching position
• Works with a bagging setup when installed for maximum discharge
• One blade handles multiple tasks without swapping several blades

How do I install and maintain the replacement blade?

Installation requires lifting the mower, removing the old blade, choosing the correct sizer for your spindle, and torquing the mounting bolt to the mower manufacturer’s specification. Routine maintenance includes balancing, sharpening as needed, and inspecting the nylon lines and blade for wear or damage.

• Always follow mower manufacturer torque and safety guidelines
• Select the included center hole sizer that matches your spindle
• Sharpen or replace blade when cuts become ragged or inefficient
• Inspect nylon lines and replace when frayed for best performance

Who is this for: Homeowners and lawn care enthusiasts with 21–22-inch walk-behind mowers (and some 23-inch decks) who want a single, multi-capable replacement blade to restore cutting performance and add functions like mulching and light dethatching. Confirm deck size and spindle hole dimensions against your mower manual before purchasing to ensure proper fit and safe operation.