Caltric 42" Deck Mulching Blade Compatible with John Deere 102 105 115 125 135 107H S100 S110 S120 S130 D100 D105 D110 D120 D125 D130 E100 E110 E120 E130 100 Series

What It Is

This is a 42-inch deck mulching blade set from Caltric, designed to replace OEM blades on select John Deere 100 Series lawn tractors. It’s for mulching grass clippings into fine particles to return nutrients to the lawn.

Fitment & Compatibility

Before buying, verify your mower deck is exactly 42 inches (measured blade tip to blade tip). This blade fits John Deere models: 102, 105, 115, 125, 135, 107H, S100, S110, S120, S130, D100, D105, D110, D120, D125, D130, E100, E110, E120, E130, and all 100 Series tractors with a 42" deck. It replaces OEM part numbers: GY20785, GY20866, GY21072, and GY21140. Measure your current blade length (21 inches typically) and center hole diameter (usually 1 inch). Confirm the blade’s thickness (around 0.25 inches) matches your spindle. If your deck is 48 inches or larger, this blade won’t fit.

Key Things to Know

• Quality: Caltric blades are aftermarket, often made of hardened steel. They’re generally durable but may not match OEM blade balance or edge retention.
• Installation: Straightforward if you have a socket set and jack stands. Always disconnect the spark plug first. Torque blade bolts to 40-50 ft-lbs.
• Common Gotcha: Mulching blades have a curved, serrated edge—they won’t bag or side-discharge well. Use only with a mulching kit or plug in place.
• Check Deck Compatibility: Some 42" decks use a different blade offset or thickness. Measure your existing blade’s center hole diameter and overall length to avoid returns.

Should You Buy It

If you own one of the listed John Deere models with a 42-inch deck and want an affordable mulching blade set for fine clippings, this Caltric option is a solid value. It’s best for DIY users who don’t mind aftermarket parts and want to save over OEM blades. Skip it if you need bagging or side-discharge performance, or if you prefer OEM-specific fit and finish.