Oregon 690-618-0 Universal 18" Dethatcher Blade

What It Is

The Oregon 690-618-0 is a universal 18-inch dethatcher blade designed to replace the standard cutting blade on select walk-behind mowers, converting them into a dethatching machine to remove thatch buildup from lawns.

Fitment & Compatibility

• Deck size: Fits mowers with an 18-inch cutting deck. Measure your deck width before buying.
• Universal design: Intended to work with many brands (EGO, Toro, Honda, etc.), but fitment is not guaranteed for all models.
• OEM vs aftermarket: This is an aftermarket part; check your mower’s manual for OEM blade part numbers and compare hole pattern (center hole and pin holes).
• Critical measurements: Center hole must be round (not star-shaped) and typically 5/8" diameter. Pin holes (for anti-scalp pins) vary—measure your existing blade’s hole pattern precisely. The blade offset and thickness also need to match.
• EGO-specific: Many EGO mowers use a proprietary offset and pin pattern; this blade often does NOT fit EGO models despite the brand tag. Confirm with EGO’s official compatibility list or measure your OEM blade.

Key Things to Know

• Quality: Mixed reviews—some report it works well for light thatch, others note it wears quickly or bends on rocks/roots. Not for heavy-duty or commercial use.
• Installation: Moderate difficulty. Requires removing the mower blade, installing this dethatcher blade, and re-torquing the bolt to manufacturer specs (typically 50-70 ft-lbs). No adapter or hardware included.
• Common gotchas: The blade may cause excessive vibration if not perfectly balanced. Always balance after installation. It can also scalp uneven lawns—raise your mower deck to the highest setting before use.
• Performance: Best on dry, thin thatch (under 1/2"). For thick thatch, a dedicated dethatcher or power rake is more effective.

Should You Buy It

Buy this if you have a compatible 18" mower (not EGO), only need occasional light dethatching, and want a low-cost alternative to a dedicated machine. Skip it if you have heavy thatch, a non-standard blade pattern, or an EGO mower—look for an OEM dethatcher blade instead to avoid fitment headaches.