Hipa 2-Pack GY20850 Medium Lift Mower Blades 7-Point Star Set for D110 D105 D130 S100 E100 42 Inch Deck Zero Turn Lawn Mower Riding Mower Models Replace GX22151 GY20850X (Mulching Blades)

What It Is

This is a 2-pack of medium-lift mulching blades designed for 42-inch cutting decks on select John Deere and other riding mowers. They replace OEM part numbers GX22151 and GY20850X, and are intended for mulching grass clippings rather than side-discharge or bagging.

Fitment & Compatibility

Before buying, confirm three things:

• Deck size: These blades fit only 42-inch decks. Measure your deck width if unsure.
• Blade pattern: The 7-point star center hole fits John Deere D100/D105/D110/D130/S100/E100 series and compatible zero-turn models. It will not fit standard round-hole or 5-point star spindles.
• OEM cross-reference: Replaces GX22151 and GY20850X. Check your current blade part number or look up your mower’s OEM blade specs.
• Dimensions: Each blade is roughly 21 inches long, 2.5 inches wide, and 0.2 inches thick. Measure your old blade length and thickness to confirm.

Key Things to Know

• Medium lift: Balances cutting with reduced engine load. Good for flat lawns with moderate grass height. Not ideal for thick, wet, or tall grass.
• Mulching focus: These blades have a curved, serrated design to chop clippings finer. They won’t throw clippings far for bagging or side-discharge.
• Installation is straightforward: Use a socket wrench and torque to 70-90 ft-lbs. Mark the blade orientation before removal—sharp edge should lead the cut.
• Check spindle condition: A worn or bent spindle will cause vibration and uneven cut. Inspect and replace if needed before installing new blades.

Should You Buy It

If you have a 42-inch John Deere D100/E100 series or compatible zero-turn mower, and you primarily mulch grass in dry, moderate conditions, this is a solid, affordable replacement set. It’s not for heavy-duty bagging or rough terrain—stick with OEM or high-lift blades if that’s your use case.