Oregon 18-inch Universal Dethatcher Blade — OEM-style with Mounting Hardware, Made in USA

Oregon 690-618-0 is an 18-inch universal dethatcher blade kit that loosens and lifts dead grass to help new seed and turf establish.

If your lawn has a layer of thatch or compacted dead grass, this OEM-style Oregon dethatcher blade provides a straightforward mechanical solution. The blade is designed to fit many 18" dethatcher and bagger assemblies and ships with the washers, bolt and adapters needed for installation. It’s manufactured in the United States and sized to the specifications commonly required by consumer dethatchers.

What are the blade’s key dimensions and fit details?

The Oregon 690-618-0 measures 18 inches overall with mounting dimensions that accommodate most universal dethatcher spindles. Outer mounting hole spacing is 3/8" by 1-1/2", center-to-center spacing is approximately 3/14", the working thickness is 0.149" and the blade lift is 1/2". Offset is 0" so it sits flush with standard carriers.

• Length: 18 inches
• Outer mounting: 3/8" x 1-1/2"
• Center-to-center: 3/14" (manufacturing spec)
• Thickness: 0.149" (W/T noted 2.25/.149")
• Lift: 1/2", Offset: 0"

How does this blade help improve lawn health?

By mechanically cutting through and lifting dead grass and accumulated debris, the dethatcher blade clears space for air, water and seed to reach the soil more easily. Removing thatch before planting or overseeding encourages stronger root contact with fresh seed and reduces the barrier between soil and nutrients. Use in spring before the first mow or in autumn for best timing with lawn recovery.

• Removes dead grass and thatch buildup
• Allows water and seed to penetrate the soil surface
• Prepares turf for overseeding and fertilizing

What’s included and how easy is installation?

The package includes the dethatcher blade plus the necessary mounting hardware: washers, a bolt and adapters tailored to fit common dethatcher assemblies. Installation is typically straightforward for anyone comfortable with basic mower or garden tool maintenance; follow the machine manufacturer’s safety instructions and torque specs when tightening fasteners.

• One universal 18" dethatcher blade (Oregon 690-618-0)
• Washers, bolt and adapter pieces included
• Fits many standard consumer dethatcher/bagger spindles

When should I dethatch and how often will I need this blade?

Dethatch once your lawn shows a noticeable thatch layer (generally over 1/2 inch) or when grass fails to absorb water and nutrients properly. Common practice is to dethatch in early spring before the first mowing or in early fall when the grass can recover. Blade life depends on soil conditions and frequency of use; replace when edges dull or damage appears.

• Recommended timing: early spring or early fall
• Inspect blade after each season for wear or bending
• Replace when cutting edges are worn or mounting holes elongate

Who is this for: Homeowners and small-property caretakers who use consumer dethatchers or bagger attachments and need a replacement or upgrade blade. It’s well suited to do-it-yourself lawn maintenance, garden tool repair shops and anyone seeking a U.S.-made, universal 18" dethatcher blade with included installation hardware.