In short, the bolt used for an oil drain plug on most Honda Accord engines has a 14mm hex head, but the thread size can vary. The exact thread pitch is usually M12 with a pitch of 1.25 or 1.5, and some engines may use M14. Confirming for your exact year and engine is important to avoid cross-threading or leaks.
Short answer
Most Honda Accord oil drain plugs use a 14mm hex head. The threaded portion is commonly M12 with pitches of 1.25 or 1.5, and a smaller number of engines use M14 with a pitch of 1.5. Always verify for your specific model/year by checking the owner’s manual, service manual, or the OEM parts diagram, or by measuring the plug you have.
Understanding variations by engine and year
Honda has used several engine families in Accord generations, which can lead to small but important differences in drain plug size. Use this as a baseline, then confirm for your exact car.
- Hex size to remove/install: 14mm is the standard for most Accords.
- Thread size options you’re likely to encounter: M12x1.25 or M12x1.5 for many engines; some older or larger-displacement engines may use M14x1.5.
- Torque range to reinstall: generally in the low-to-mid 30s Newton-meters for larger threads and around the mid-20s Newton-meters for smaller M12 threads. Always default to the exact spec in your manual or from Honda’s service data.
Because exact specifications vary, use these as a guide and verify with your car’s documentation or parts diagram.
How to confirm the exact size for your Accord
To avoid guessing, use a direct verification process tailored to your vehicle—the steps below help you identify the correct bolt size and torque without risking damage.
- Check the owner's manual or service manual for your specific year and engine to find the drain plug size and torque specification.
- Look up the OEM Honda parts diagram for your exact year/model to see the drain plug thread specification.
- If you have access to the current drain plug, measure the threaded portion with a caliper or thread gauge, or compare with known standard sizes (M12x1.25, M12x1.5, M14x1.5).
- When in doubt, bring the old plug to an auto parts store to match it or request the correct replacement part by year/model.
Once you’ve identified the correct size, use the manufacturer’s torque specification and the proper drain washer when reinstalling.
Torque and installation tips
Following the correct torque and using proper gaskets or washers helps ensure a leak-free seal and preserves the oil pan’s integrity.
General guidance
Torque should be applied to the exact spec listed in your Honda service information. If you cannot locate a precise figure, a typical range for M12 threads is roughly 25–30 Nm (about 18–22 ft-lb). For larger M14 threads, expect higher torque, often in the 35–45 Nm range. Always aim for the official specification when available.
Practical installation notes
- Replace the crush washer whenever you remove the drain plug. - Clean the drain hole and plug flange before reinstalling. - Hand-tighten first, then torque to spec with a properly fitting wrench to avoid rounding the hex head. - After refilling with oil, check for leaks around the drain plug area.
Summary
In most Honda Accord models, the oil drain plug uses a 14mm hex head, with the threaded portion typically being M12x1.25 or M12x1.5. Some engines may use M14x1.5. To ensure a correct fit and seal, verify the size and torque specification for your exact year and engine from the owner's or service manual, or by checking the OEM parts diagram. When in doubt, measure the plug or consult a parts specialist, and always replace the crush washer and torque to the manufacturer’s specification.