Are all spark plug threads metric?

The rest of the world has never used American threaded spark plugs – only metric. Ford tractors and cars made outside the US have also used only metric spark plugs too….

What size are the threads on a spark plug?

Identifying NGK Spark Plugs

Letter Thread Pitch
A 18mm 1.50mm
B 14mm 1.25mm
C 10mm 1.00mm
D 12mm 1.25mm

Do all spark plugs have the same thread?

No, Mike72, your take on spark plug threads is not correct. The tolerance from nominal size is different on a spark plug than a standard metric thread.

What metric size 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

How do you determine spark plug thread size?

The first letter of the ND spark plug code (in this case an “X”) indicates the thread size of the spark plug. There are three size spark plug threads currently being used in motorcycles and ATVs. “W” indicates a 14 mm x 1.25 pitch size, “X” indicates a 12 mm x 1.25 size and “U” indicates a 10 mm x 1.0 size.

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What thread is on a 5’8 spark plug?

Spark Plugs – 14mm Spark Plug Thread Size – 5/8 in.

What does 14×1 thread mean?

Thread pitch is the distance between threads expressed in millimetres. For example, a thread pitch of 1.25 means the distance between each thread is 1.25mm. When a thread size is expressed in a set of two numbers, for example, 14×1. … 25 the first number is the thread diameter and the second number is the thread pitch.

How do I choose the right spark plug?

At the auto supply store, don’t just ask a salesperson which type of plug you should buy — you have a very good chance of getting the wrong one. First look up the specifications yourself, and then ask for the plug by number. If you’re unsure, have a salesperson double-check it for you.

What size wrench do you need for a spark plug?

You’ll need just a few tools to change out the spark plugs on your car. The most important tool is a socket wrench with an extension and a spark plug socket. Spark plug sockets come in two sizes: 5/8 inches and 13/16 inches. Most spark plug sockets have a rubber insert that holds the plug snugly in place.

What is hex size on a spark plug?

Hex refers to the socket or the diameter in the center of a spark plug which is used to turn the spark plug and screw it down or undo it. There are a lot of options out there, but in general, you need 14,16,18,21 mm sockets with both 12 and 6 point configuration.

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What is the most common spark plug socket size?

The most common spark plug size is 5/8″ but the actual size you need is very vehicle dependent. Spark plug sockets are usually sold individually (Gearwrench example) but also come in sets.

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.

Are all spark plugs 16mm?

Man in the Car

That is correct, but the confusion arises because the above listed thread size/hexagon size combinations are what have been historically accepted as normal, but not all spark plugs are actually made with those sizes (the 14mm thread/16mm hexagon ones as found in the K being a case in point).

What size is a NGK Spark Plug?

NGK Spark Plugs

Gap 0.027″ (0.7mm)
Thread Size 14mm
Tip Projected Tip
Type Resistor, Compact Small Engine Plug
Replaces NGK 1195, BPMR7A