UDC Parts 42" John Deere Replacement Mower Blades, 7-Point Star Centre, 2-Pack — 21-3/8" Mulching Blades

UDC Parts replacement blades for 42" John Deere decks are heavy-duty 7-point star mounting mower blades designed to restore cutting performance and support mulching on compatible John Deere lawn tractors.

These two-pack mower blades are engineered to match the fit and cutting profile of John Deere OEM numbers such as GY20850, GX22151 and AM141033, giving you an economical way to renew a 42-inch cutting deck. Each blade measures 21-3/8" diagonally with a 2-3/4" width, a 1" air lift, and a 7-point star center hole that fits many John Deere spindle housings. Before ordering, confirm your deck size and that your spindle uses the 7-point star pattern, as parts can vary between models and production runs.

Will these blades fit my specific John Deere lawn tractor?

These blades are designed to replace multiple John Deere OEM part numbers and to fit many 42-inch decks across D-series, X-series, LA-series, and other models listed by John Deere. Fit depends on your deck type and spindle mounting — the 7-point star center is the critical compatibility detail. Verify your tractor model, deck size, and spindle pattern before purchasing to ensure a correct match.

• Compatible OEM references: GY20850, GX22151, AM141033 and more.
• Designed for 42" decks with a 7-point star center mounting pattern.
• Check model lists: D105/D110/D130, X300/X310 (42" X Edge only), LA105/LA115/LA125, Z225, and others.
• Confirm deck serial range or spindle type when in doubt.

How do these blades affect cutting and mulching performance?

The blade geometry includes an air lift and extended cutting edge to promote grass lift and improved clippings circulation for a cleaner cut and better mulching action. They are shaped to replicate the airflow and cut zone of the OEM parts, helping distribute clippings and reduce scalping. Properly balanced blades also lower vibration and stress on spindle assemblies.

• Air lift height: 1" to encourage upward grass lift.
• Cutting edge length: 5-7/16" optimized for a 42" deck profile.
• Balanced for reduced vibration and consistent cut quality.
• Mulching-style geometry for finer clipping distribution.

What are the exact dimensions and hardware details I should know?

Each UDC Parts blade measures 21-3/8" diagonally (end-to-end) and is 2-3/4" wide at the broadest point. The center hole matches the 7-point star pattern used by many John Deere 42" decks. These physical specs are essential to confirm before installation to avoid fitment problems.

• Overall length (diagonal): 21-3/8".
• Width: 2-3/4"; cutting edge length: 5-7/16".
• Center mount: 7-point star; air lift: 1".
• Sold as a 2-pack for replacing both blades on twin-blade 42" decks.

What warranty or product support comes with these replacement blades?

UDC Parts provides one year of product support for manufacturing defects and product-related issues to give you confidence in your purchase. Support covers defects in materials and workmanship, though normal wear and damage from improper use are excluded. Keep your purchase details and appliance information for any support claims.

• One-year product support for manufacturing defects.
• Keep model and purchase information for faster assistance.
• Not a replacement for routine sharpening or damage from misuse.

Who is this for: These replacement blades are aimed at homeowners and groundskeepers who maintain John Deere lawn tractors with 42" decks that use the 7-point star spindle mounting. If your mower’s OEM number matches those listed or your deck requires a 42" blade with the same dimensions, this two-pack offers a cost-effective way to restore cutting quality and mulching capability. If you’re unsure about fit, verify your tractor’s model, deck type and spindle pattern before ordering to ensure compatibility.