What size Tap do I need for a spark plug?
Use drill size 33/64.
What size is a spark plug socket in MM?
Most spark plugs require a 5/8″ (16mm) size spark plug socket. This refers to the size of the flats on the spark plug that are in contact with the socket.
Are all spark plugs 14mm?
Most plugs these days are 14mm thread; however, 18mm and 7/8-inch threads have been used on many earlier vehicles, and you will see some 10mm or 12mm threads on newer imported motorcycles and small engines. Another important factor with spark plugs is the type of seat or sealing edge where the plug mates to the head.
Can you tap a spark plug hole?
Spark plugs that haven’t been changed for a long time can become one with the cylinder head. Fortunately, it’s possible to repair damaged threads instead of scrapping the head. In fact, it may be possible to simply chase the old threads with a tap and clean them up. Or, as illustrated, you can insert a Helicoil.
What is the drill size for M12 tap?
Metric Threads
| Thread | Drill size for tapping standard metric threads | Drill size for tapping fine metric threads |
|---|---|---|
| M8 | 6.8 | 7 |
| M10 | 8.5 | 8.8 |
| M12 | 10.2 | 10.8 |
| M14 | 12 | 12.5 |
What size hole do I need to drill for a M12 tap?
Tap Size
| Tap Size | Drill Size |
|---|---|
| M11 x 1.50 | 9.7mm |
| M12 x 1.25 | 10.9mm |
| M12 x 1.5 | 10.7mm |
| M12 x 1.75 | 13/32 |
What size in metric is a spark plug?
Metric threads spark plugs according ISO 28741
| Size | Major Diameter (mm) | Pitch (mm) |
|---|---|---|
| M10 x 1.0 | 10.0 | 1.00 |
| M12 x 1.25 | 12.0 | 1.25 |
| M14 x 1.25 | 14.0 | 1.25 |
| M18 x 1.5 | 18.0 | 1.50 |