John Deere UC21583 Mower Blade 42" Decks LA100 LA125 S240 D100 E130 X125 X145 Tractors 2-Pack

What It Is

This is a 2-pack of John Deere OEM mower blades designed for 42-inch cutting decks on select John Deere lawn tractors. They are intended for residential mowing, providing a clean cut for grass and light debris.

Fitment & Compatibility

Before buying, confirm your deck is exactly 42 inches (measured from blade tip to tip). These blades fit models including LA100, LA125, S240, D100, E130, X125, and X145. They are OEM John Deere parts (part number UC21583), which ensures exact dimensions and bolt patterns. Check your current blade’s length (21 inches typically) and center hole size (usually 1 inch). Aftermarket blades may vary, so stick with OEM for guaranteed fit.

Key Things to Know

• Quality: OEM blades are heat-treated and balanced for durability and consistent cutting. They may cost more than aftermarket but last longer.
• Installation: Requires a socket wrench and a block of wood to jam the blade. Torque the bolt to 40-50 ft-lbs. No special tools needed.
• Common Gotchas: Blades may ship with a protective coating—remove it before use. Always replace blades in pairs for balanced cutting. Check for deck damage before installing.
• Safety: Disconnect the spark plug before working under the deck. Wear gloves to avoid cuts.

Should You Buy It

If you own one of the listed John Deere tractors with a 42-inch deck and want a reliable, drop-in replacement, this 2-pack is a solid choice. It’s ideal for routine seasonal maintenance or replacing dull or nicked blades, and the OEM fitment eliminates guesswork.