What size thread is a NGK spark plug?

Identifying NGK Spark Plugs

Letter Thread Pitch
E 8mm 1.00mm
G PF 1/2″ pipe
AB 18mm 1.50mm
BC 14mm 1.25mm

What size are standard spark plug threads?

Threads. There are currently three spark plug thread diameter and pitch sizes used on motorcycles and ATVs: 10 mm x 1.0, 12 mm x 1.25 and 14 mm x 1.25. There are currently two thread reaches (lengths) used: 1/2 inch and 3/4 inch. Never use a spark plug of the wrong reach.

How do you determine spark plug thread size?

The thread size for Spark Plugs refers to the size of the threads that screw into the cylinder head. The first number is the diameter. The second number is the thread pitch….Some common thread sizes are:

  1. M18 x 1.5.
  2. M14 x 1.25.
  3. M12 x 1.25.
  4. M10 x 1.0.

Does NGK Iridium IX need to be gapped?

In most cases your Iridium Power plugs do not need to be gapped. Should you decide to re-gap your Iridium Power plug, use extreme caution as improper gapping may damage or destroy the Iridium center electrode or porcelain center.

Are spark plug threads universal?

While you should buy spark plugs in matching sets for your vehicle, not all spark plugs are universal. Spark plugs come in different sizes with different gaps and are manufactured using a variety of metals. Finding the ones that you need can be difficult.

What is the recommended spark plug gap?

For most racing applications, you usually want the plug gap to be between 0.020 and 0.040 of an inch. Most engine builders seem to settle around 0.035 of an inch. Factors such as the type of ignition you run, cylinder heads, fuel and even timing can affect how much gap will work best for you.

Are spark plugs a standard size?

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. This spark plug requires the 5/8″ spark plug socket, which will probably fit a 3/8 ratchet extension.

What are NGK iridium spark plugs gapped at?

When getting new plugs, you must understand the gap that you should leave between the two electrodes. Car measurements differ, and you can thus not use anything that you find on the market. In most cases, the gaps should be in the regions of 0.028 to 0.06 inches.

Are NGK spark plugs gapped?

While most NGK spark plugs are pre-gapped, there are occasions when the gap requires adjustment. NGK also recommends adjusting the gap no more than +/- 0.008” from the factory preset gap.

Will any spark plug fit any car?

In other words, any brand of spark plug can be used in any vehicle make or model application assuming the plug has the correct dimensions, design and heat range. The engine won’t know the difference. They may not have a plug with the correct electrode configuration, reach or heat range.

What is an iridium plug?

What about iridium spark plugs? Iridium spark plugs feature a fine wire center electrode that is designed to conduct electrical energy better and increase firing efficiency. There is a price for this precious metal. Iridium spark plugs are typically the most expensive, ranging from $8 to $15 each.

Are NGK Spark Plugs pre-gapped?

While most NGK spark plugs are pre-gapped, there are occasions when the gap requires adjustment. Care must be taken to avoid bending or breaking off the fine-wire electrodes. If the gap must be adjusted, use a tool that only moves the ground electrode and does not pry between or against the electrodes.