311280001 Starter Key for Lawn mowers, Mower Fuse Keys for Ryobi 40V Lawn Mower P1100, RY40104, RY40108, RY40109 (red - 2 pcs)

What It Is

This is a replacement starter key (safety key/fuse key) for select Ryobi 40V cordless lawn mowers. It must be inserted into the mower’s battery slot to complete the electrical circuit and allow the mower to start. Sold as a 2-pack in red.

Fitment & Compatibility

• Exact models confirmed: Ryobi P1100, RY40104, RY40108, RY40109.
• Check your mower’s model number (stamped on a label under the battery cover or on the rear frame).
• Not universal – this key is specific to Ryobi 40V push mowers with a “slot-in” safety key design. It will not fit older Ryobi 18V mowers or any brand other than Ryobi.
• OEM vs aftermarket: This is a third-party replacement, not an official Ryobi part. It should work but may feel slightly looser than the OEM key.
• Measurements: The key blade is about 1.5” long and 0.6” wide. If your original key has a different shape (e.g., a longer tab or wider base), this won’t fit.

Key Things to Know

• Installation is instant: Just slide the key into the slot until it clicks. No tools needed.
• Common gotcha: The key may not sit flush if the mower’s slot has debris or corrosion. Clean the slot with compressed air or a dry cloth first.
• Quality note: Some users report the key feels slightly thinner than OEM, but it holds in place during mowing. If it falls out, you may need to bend the metal tabs gently outward.
• Red color only: The listing is for red keys. If your mower uses a different color (e.g., black or yellow), it still works electrically, but color is cosmetic.

Should You Buy It

Buy this if you lost your original Ryobi 40V mower key and need a quick, low-cost replacement. It’s a direct fit for the listed models and works reliably for most users. Skip it if you want an exact OEM match or if your mower model isn’t in the compatibility list – measure your old key first.