Denso W20M-U Spark Plug

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Rating

3.3 / 5 Overall
Denso	W20M-U
Brand	Code
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
4.0 / 5 Design
U-Groove	Standard
Ground type	Center type

Specifications

0.7mm (.028")	20
Gap	Heat range
⌀14mm	1.25mm
Thread diameter	Thread pitch
9.5mm (3/8")	21mm (13/16")
Reach	Hex size
Gasket	Removable Nut
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

Cross-reference (6)

Alternative spark plugs found in cross-reference docs provided by manufacturers

XST255

Iridium-Platinum

4.2/ 5

.030"9.5mm, ⌀14x1.25HR 6

WS7E

Copper

2.9/ 5

.020"9.5mm, ⌀14x1.25HR 7

BM6A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

255

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 6

CJ8

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 8

BMR6A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

Deep reference (42)

A second level of cross-reference: if A=B and B=C, then A=C

XST254

Iridium-Platinum

4.2/ 5

.024"9.5mm, ⌀14x1.25HR 3

XST255

Iridium-Platinum

4.2/ 5

.030"9.5mm, ⌀14x1.25HR 6

XST255

Iridium-Platinum

4.2/ 5

.030"9.5mm, ⌀14x1.25HR 6

XST255

Iridium-Platinum

4.2/ 5

.030"9.5mm, ⌀14x1.25HR 6

843EZ

Copper-Iridium

3.8/ 5

.024"9.5mm, ⌀14x1.25HR 8

W14MR-U

Copper

-

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 14

W20MR-U

Copper

-

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 20

W14MR-U

Copper

-

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 14

W20MR-U

Copper

-

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 20

W20MR-U

Copper

-

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 20

5846

Copper

3.2/ 5

.024"9.5mm, ⌀14x1.25HR 14

SE254DPT

Copper

3.2/ 5

.024"9.5mm, ⌀14x1.25HR 3

WS8E SE

Copper

2.9/ 5

.020"9.5mm, ⌀14x1.25HR 8

WS9EC

Copper

2.9/ 5

.024"9.5mm, ⌀14x1.25HR 9

CJ8

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 8

RCJ8

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 8

BM6A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

BMR6A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

BMR7A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 7

254

Copper

2.9/ 5

.024"9.5mm, ⌀14x1.25HR 3

BM6A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

254

Copper

2.9/ 5

.024"9.5mm, ⌀14x1.25HR 3

255

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 6

WS7E

Copper

2.9/ 5

.020"9.5mm, ⌀14x1.25HR 7

843-1

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 8

CJ8

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 8

254DP

Copper

2.9/ 5

.024"9.5mm, ⌀14x1.25HR 3

WS7E OSN

Copper

2.9/ 5

.020"9.5mm, ⌀14x1.25HR 7

WS8E SE

Copper

2.9/ 5

.020"9.5mm, ⌀14x1.25HR 8

WS8E SE

Copper

2.9/ 5

.020"9.5mm, ⌀14x1.25HR 8

WS9EC

Copper

2.9/ 5

.024"9.5mm, ⌀14x1.25HR 9

CJ8

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 8

RCJ8

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 8

BM6A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

BMR6A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

BMR7A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 7

B-4

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 4

255

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 6

BM6A

Copper

2.9/ 5

.028"9.5mm, ⌀14x1.25HR 6

840C

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 8

RCJ8

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 8

255

Copper

2.9/ 5

.030"9.5mm, ⌀14x1.25HR 6

Same specs (1)

Products that have identical characteristics that impact interchangability

W20S-U

Copper

-

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 20

One step colder (2)

Colder spark plugs with same characteristics for moderately tuned engines (75–100 hp increase)

W22S-U

Copper

-

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 22

W22M-U

Copper

-

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 22

Two steps colder (1)

Two steps colder spark plugs with same characteristics for heavily modified engines (150-200 hp increase)

W24S-U

Copper

-

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 24