EGO Power+ Parts 3705938001 21" Lawnmower Blade for LM2100, LM2100SP, LM2101, LM2102SP, LM2140SSP and LM2142SP 21" Lawn Mowers

What It Is

This is an OEM replacement blade for EGO’s 21-inch cordless mowers, designed to cut grass efficiently on residential lawns. It’s a single blade intended for standard mulching or bagging use on select EGO 21″ models.

Fitment & Compatibility

Exact model check – This blade fits only these EGO mowers: LM2100, LM2100SP, LM2101, LM2102SP, LM2140SSP, and LM2142SP. It does not fit older 20″ or 56V 20″ models, nor any other brand.

Measure before buying – The blade is 21 inches long with a 1-inch center hole and a 2.8-inch offset. Verify your existing blade’s length, center hole diameter, and offset pattern match exactly. If your mower uses a different blade shape or mounting style (e.g., double-point or high-lift), this won’t work.

OEM vs aftermarket – This is an EGO genuine part. Aftermarket blades may be cheaper but can vary in balance, thickness, and fitment. For warranty and safety, stick with OEM unless you’re certain of compatibility.

Key Things to Buy

• Quality – EGO’s OEM blades are heat-treated, durable, and pre-balanced. Expect 2–3 seasons of typical residential use before dulling.
• Installation – Easy for DIYers. You’ll need a 15mm socket or wrench. Always disconnect the battery and lift the mower safely. Torque the blade bolt to 30–50 ft-lbs (check your manual).
• Common gotchas – Don’t overtighten; it can strip the bolt or crack the blade mount. Also, note that this is a single blade – some EGO 21″ models use a two-blade system, but this one is for single-blade decks only.
• Performance – Best for standard mulching and bagging. If you need high-lift for wet grass or specialized mulching, consider EGO’s “High Lift” or “Mulching” blades (different part numbers).

Should You Buy It

If you own one of the listed EGO 21″ mowers and need a direct, reliable replacement that matches factory specs, this is the right choice. It’s not for older models, two-blade decks, or budget-minded shoppers who want aftermarket savings. For most residential users, the OEM fit and durability justify the $40 price.