NGK PMR8A 5851 Spark Plug

Verify with Amazon ConfirmedFit before buying

Rating
Brand	Code
3.8 / 5 Overall
NGK	PMR8A
4.0 / 5 Materials
Platinum	Platinum
Ground electrode	Center electrode
3.5 / 5 Design
Standard	Fine Wire
Ground type	Center type

Specifications
Gap	Heat range
0.7mm (.028")	8
⌀10mm	1mm
Thread diameter	Thread pitch
19mm (3/4")	16mm (5/8")
Reach	Hex size
Gasket	Solid
Seat	Terminal
1	Non-Projected
Ground count	Projection

Cross-reference and alternatives

How we find alternative spark plugs How we rate spark plugs

Cross-reference (2)

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

IU24

Copper-Iridium

4.3/ 5

.035"19mm, ⌀10x1HR 24

RG4PHP

Platinum

3.6/ 5

.020"19mm, ⌀10x1HR 4

Deep reference (10)

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

DIMR8A10

Iridium-Platinum

4.7/ 5

.039"19mm, ⌀10x1HR 8

SIMR8A9

Iridium-Platinum

4.4/ 5

.035"19mm, ⌀10x1HR 8

IU27

Copper-Iridium

4.3/ 5

.035"19mm, ⌀10x1HR 27

CR8EIX

Copper-Iridium

3.8/ 5

.031"19mm, ⌀10x1HR 8

PMR8B

Platinum

3.8/ 5

.028"19mm, ⌀10x1HR 8

RG6YC

Copper

3.3/ 5

.030"19mm, ⌀10x1HR 6

C8E

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 8

CR8E

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 8

CR8EB

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 8

MR7F

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 7

Same specs (1)

Products that have identical characteristics that impact interchangability

PMR8B

Platinum

3.8/ 5

.028"19mm, ⌀10x1HR 8

Bigger gap (12)

0.1..0.3 mm gap increase for better performance given your ignition system can handle it

IMR8C-9H

Iridium-Platinum

4.2/ 5

.035"19mm, ⌀10x1HR 8

CR8EIA-9

Iridium-Platinum

4.2/ 5

.035"19mm, ⌀10x1HR 8

CR8EIA-10

Iridium-Platinum

4.2/ 5

.039"19mm, ⌀10x1HR 8

CR8EIB-10

Iridium-Platinum

4.2/ 5

.039"19mm, ⌀10x1HR 8

CR8EIB-9

Iridium-Platinum

4.2/ 5

.035"19mm, ⌀10x1HR 8

MR8BI-8

Iridium-Platinum

4.2/ 5

.031"19mm, ⌀10x1HR 8

MR8AI9

Iridium-Platinum

4.2/ 5

.035"19mm, ⌀10x1HR 8

CR8EIX

Copper-Iridium

3.8/ 5

.031"19mm, ⌀10x1HR 8

U24ESR-N

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 24

CR8E

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 8

CR8EH-9

Copper

2.9/ 5

.035"19mm, ⌀10x1HR 8

CR8EB

Copper

2.9/ 5

.031"19mm, ⌀10x1HR 8

One step colder (1)

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

PMR9B

Platinum

3.8/ 5

.028"19mm, ⌀10x1HR 9