NGK spark Plug chart: How to decipher the meaning of NGK spark plug?

Deciphering the meaning of an NGK spark plug can be an intimidating job for the beginner. Even many professional Garage owners may sometimes find it hard to discern the meaning.

NGK spark model like BPMR7R defines a very significant meaning which is worth knowing when you are thinking about replacing the stock spark plug of your engine.

NGK brings spark plugs for numerous vehicles, including ATV, four-wheeler, motorbike, and the like. Besides, they are too prevalent on the market to get easy concentration.

In case you are having a tough time discerning the code of your NGK spark plug, this article will be a complete guideline to decipher the meaning with proper dexterity.

NGK spark Plug chart

How to decipher the meaning of an NGK spark plug?

Suppose you have got a BPR5ES-11 spark plug from NGK. How would you decipher the code?  Here is the simple explanation-

B- The first code B represents the thread diameter. In that case, B represents a 14mm Thread diameter. B also represents a 16mm hex size. Here are some of the other letter code and their meaning you should know-

NGK Thread and Hex size

Code

Thread size

Hex size

A

18 mm.

20.8 mm

B

14 mm.

20.8 mm

BC

14 mm.

16 mm

BK

14 mm.

16 mm

C

10 mm.

16 mm

D

12 mm.

18 mm

DC

12 mm.

16 mm

E

8 mm.

13 mm

P- The second letter code P defines that the spark plug comes with a projected insulator type. Here are some of the code and meaning you should know to decipher the meaning of a particular spark plug-

NGK Construction shape/ feature

M

Compact

L

Short type

P

Projected center electrode insulator.

R

Resistor Type

U

Surface or semi surface discharge

Z

Inductive Suppressor

R- The third code R defines that it is a resistor-type spark plug. We have already mentioned that letter in the above table.

5- Code 5 defines the heat range of the spark plug. The lower the number, the hotter the spark plug will be. Code 5 defines that it is a moderate spark plug with a medium hit range. Here are some of the other meaning you should know regarding the heat range of the spark plug-

NGK Heat range

2

Hottest

3

Hotter

4

Hot

5

Medium

6

Cold

7

Cold

8

Colder

9

Colder

10

Coldest

The next code E defines the thread reach.  Here are some of the other code you would require to discern the meaning of your particular spark plug

NGK Thread reach

E

19 mm

EF

17.5 mm

EH

19 mm (Half thread)

H

12.7 mm.

L

11.2 mm.

S- The next code of this spark plug is S. S represents a standard type spark plug. NGK offers a variety of spark plugs and their types. Here are some of the code everyone should know to find out the meaning of a particular spark plug-

NGK Spark plug type/firing end construction

B

Integra terminal

CM

Slant ground electrode compact type.

CS

Slant ground electrode.

G, GV

Racing spark plug.

I

Single iridium spark plug.

IX

Iridium IX spark plug.

J

2-projecting ground electrodes.

K

2-ground electrodes.

-LM

Compact type (Insulator length 14.5)

N

Special ground electrode.

P

Platinum spark plug

Q

4-ground electrode

S

Standard type

T

3-ground electrodes.

U

Semi-surface discharge gap

Y

V-grooved center electrode.

Z

Special design.

The final code -11 represents the spark gap. In that case, this model has a 1.1mm spark gap. Here are some of the other meanings-

NGK Spark gap

-7

0.7 mm

-9

0.9 mm

-10

1.0 mm

-11

1.1 mm

-13

1.3 mm

-15

1.5 mm

NGK Some special terms

-A

Non-gasket

-D

Metal shell: Nickel plating.

-E

Special resistance.

-G

Copper-cored ground electrode.

-H

Special thread shape

-J

2 –ground electrode.

-K

Vibration-resistance ground electrode.

-N

Special ground electrode.

-Q

4-ground electrode.

-S

Special gasket.

-T

3-ground electrode.

-U

Semi surface discharge type

IX-P

Iridium Max plug.

IX-LPG

Iridium IX plug for LPG car.

RX-P

Premium RX plugs.

Some other thread diameter/hex size/ thread length/configuration

Code

Thread diameter

Thread length

Seat configuration

Hex size

F

14 mm

19.0

Gasket

Hex 16.0 mm

FE

14 mm

19.0

Gasket

Hex 16.0 mm.

G

14 mm

19.0

Gasket

Hex 20.8 mm.

J

12 mm

19.0

Gasket

Hex 18 mm.

K

12 mm

19.0

Gasket

Hex 16 mm.

KA

12 mm

19.0

Gasket

Hex 14 mm.

KB

12 mm

19.0

Gasket

Hex 14 mm.

KE

12 mm

19.0

Gasket

Hex 16 mm.

KF

12 mm

19.0

Gasket

Hex 14 mm.

KG

12 mm

19.0

Gasket

Hex 14 mm.

L

10 mm

12.7

Gasket

Hex 16 mm.

M

10 mm

19.0

Gasket

Hex 16 mm.

MA

10 mm

19.0

Gasket

Hex 14mm.

MF

10 mm

19.0

Gasket

Hex 14mm.

NA

12 mm

17.5

Tapered seat

Hex  14 mm.

T

14 mm

17.5

Tapered seat

Hex  16 mm

U

14 mm

11.2

Tapered seat

Hex 16 mm.

W

18 mm

10.9

Tapered seat

Hex 20.8 mm.

X

14 mm

9.5

Gasket

Hex 20.8 mm.

Y

14 mm

11.2

Tapered seat

Hex 16 mm.

Note:

If you are still finding it tough to decipher the meaning, you may go to this link to gain some better understanding.

Why should you pick up an NGK spark plug?

NGK spark plugs are simply the best on the market. The manufacturer has been delivering quality spark plug for a long time. That is why they know which spark plug would work in which situations.

You would find an NGK spark plug for your Car, SUVs, ATVs, motorcycle, Marine, Garden equipment, and so many other sectors. You may not like an NGK spark plug, but ignoring the product is quite impossible.

Final words

The market is loaded with tons of NGK spark plugs for almost all kinds of automotive, marine, and garden equipment. But deciphering the code of a particular spark plug model can be tough without proper instructions. We hope this article will come in handy to give you perfect instruction to get the meaning of your particular spark plug.

Last Updated on June 19, 2021 by sajjad

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