NGK XR4 5858 Spark Plug

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Rating

3.1 / 5 Overall
NGK	XR4
Brand	Code
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
3.3 / 5 Design
Standard	V-Cut
Ground type	Center type

Specifications

1mm (.039")	4
Gap	Heat range
⌀14mm	1.25mm
Thread diameter	Thread pitch
9.5mm (3/8")	21mm (13/16")
Reach	Hex size
Gasket	Solid
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

Cross-reference (8)

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

W14PR-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 14

W16PR-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 16

86

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 6

86BP

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 6

58S

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 18

RJ14YC

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 14

RJ18YC

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 18

WR10FCY

Copper

2.7/ 5

.059"9.5mm, ⌀14x1.25HR 10

Deep reference (24)

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

XS85

Iridium-Platinum

4.2/ 5

.035"9.5mm, ⌀14x1.25HR 5

WR9FPY

Copper-Platinum

3.3/ 5

.059"9.5mm, ⌀14x1.25HR 9

WR9FPZ

Copper-Platinum

3.3/ 5

.079"9.5mm, ⌀14x1.25HR 9

W9PR-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 9

W14PR-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 14

W14PR-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 14

W9PR-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 9

W14PR-U

Copper

3.3/ 5

.028"9.5mm, ⌀14x1.25HR 14

R5670-5

Copper

-

3.1/ 5

.031"9.5mm, ⌀14x1.25HR 5

XR45

Copper

-

3.1/ 5

.059"9.5mm, ⌀14x1.25HR 4

XR45

Copper

-

3.1/ 5

.059"9.5mm, ⌀14x1.25HR 4

WR9FCY

Copper

2.9/ 5

.059"9.5mm, ⌀14x1.25HR 9

86

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 6

RJ14YC

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 14

4275

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 5

J12YC

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 12

BR5HS

Copper

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 5

RJ14YC

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 14

RJ18YC

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 18

86

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 6

86

Copper

2.9/ 5

.035"9.5mm, ⌀14x1.25HR 6

847

Copper

2.9/ 5

.071"9.5mm, ⌀14x1.25HR 8

WR10FCY

Copper

2.7/ 5

.059"9.5mm, ⌀14x1.25HR 10

WR10FCZ

Copper

2.7/ 5

.079"9.5mm, ⌀14x1.25HR 10

Same specs (1)

Products that have identical characteristics that impact interchangability

XR4IX

Copper-Iridium

3.8/ 5

.039"9.5mm, ⌀14x1.25HR 4

One step colder (2)

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

XR5IX

Copper-Iridium

3.8/ 5

.039"9.5mm, ⌀14x1.25HR 5

XR5

Copper

-

3.1/ 5

.039"9.5mm, ⌀14x1.25HR 5