2 Pack GY20850 Lawn Mower Blades with Blade Nuts for John Deere D100 D105 D110 D130 E100 E120 E130 S100 S120 S130 LA105 LA115 Replaces John Deere 42 Inch Mower Blades GX22151 UC21583 AM141033

What It Is

This 2-pack of 42-inch mower blades (with blade nuts included) is designed for side-discharge or mulching on select John Deere lawn tractors. Each blade measures roughly 21 inches long, with a center hole and offset lift for standard cutting performance.

Fitment & Compatibility

Before buying, confirm your deck size is exactly 42 inches (measured blade tip to tip). This kit fits John Deere D100, D105, D110, D130, E100, E120, E130, S100, S120, S130, LA105, and LA115 models. It replaces OEM part numbers GX22151, UC21583, and AM141033. Measure your existing blade length (21 inches) and center hole diameter (about 7/8 inch). Also check that the blade nuts (5/8-inch hex) match your spindle. If your deck is 48 or 54 inches, this set won’t work.

Key Things to Know

• Quality: Aftermarket blades at this price are usually stamped steel—adequate for residential use but may dull faster than OEM or heat-treated options.
• Installation: Use a torque wrench to tighten blade nuts to 40–50 ft-lbs. Over-tightening can warp the blade or strip threads.
• Common gotchas: The included blade nuts might be slightly thinner than OEM; reuse your original washers if they fit better. Always check blade balance before installing—unbalanced blades cause vibration and deck damage.
• Pack size: Two blades cover one deck change; buy two packs if you want a full spare set.

Should You Buy It

If you own one of the listed John Deere 42-inch deck tractors and need a budget-friendly replacement for routine residential mowing (not heavy-duty commercial use), this 2-pack with nuts is a convenient, well-rated option. For thicker grass or frequent use, consider paying more for OEM or hardened blades.