The battery terminal clamp on most Honda Accords uses a 10mm hex bolt head to secure the cable to the battery post.
That said, some older or different clamp designs may use an 8mm or 12mm fastener, so it’s worth verifying on your specific model and year before attempting removal.
How to verify the exact size for your car
Use the following quick checks to confirm the bolt size on your Accord. This will help you choose the right wrench or socket without risking damage to the bolt.
- Try a 10mm socket or wrench first; it fits the majority of Honda Accord battery clamps.
- If 10mm does not engage the head, test an 8mm and a 12mm to see which size fits snugly without rounding.
- Inspect both battery terminals and clamps in case your model uses a different clamp design that employs a smaller or larger fastener.
- When removing or reinstalling, ensure the engine is off and the negative terminal is disconnected first to avoid short circuits.
Note that exact sizes can vary by model year and trim. If you’re unsure, consult the vehicle’s service manual or a dealership parts desk for the precise specification for your car.
Additional details by model year
In most Honda Accords from the late 1990s to mid-2010s, the clamp bolt tends to be 10mm. Some newer or different clamps may use a metric size or a standard bolt head that differs from the common 10mm; verify with your specific VIN or by measuring the head with a caliper or by trying different sockets carefully.
Summary
Bottom line: expect a 10mm bolt head for the battery terminal clamp on a typical Honda Accord, but always verify on your exact year and trim. Use the correct size socket, avoid forcing the bolt, and consult the service manual if needed.