NGK R5525-9 Spark Plug

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Rating
Brand	Code
3.2 / 5 Overall
NGK	R5525-9
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
3.5 / 5 Design
Standard	Fine Wire
Ground type	Center type

Specifications
Gap	Heat range
0.65mm (.026")	9
⌀14mm	1.25mm
Thread diameter	Thread pitch
12.7mm (1/2")	21mm (13/16")
Reach	Hex size
Gasket	Removable Nut
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 (1)

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

IWF27

Copper-Iridium

4.3/ 5

.031"12.7mm, ⌀14x1.25HR 27

Deep reference (9)

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

XS4092

Iridium-Platinum

4.2/ 5

.031"12.7mm, ⌀14x1.25HR 2

BR9HIX

Copper-Iridium

3.8/ 5

.031"12.7mm, ⌀14x1.25HR 9

R5530-9

Gold-Palladium-Platinum

3.8/ 5

.026"12.7mm, ⌀14x1.25HR 9

L77JC4

Copper

3.3/ 5

.039"12.7mm, ⌀14x1.25HR 77

B9HS

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 9

BR9HS

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 9

2634

Copper

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 1

QL77JC4

Copper

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 77

411

Copper

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 1

One step colder (1)

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

R5525-10

Copper

3.2/ 5

.026"12.7mm, ⌀14x1.25HR 10

Two steps colder (1)

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

R5525-11

Copper

3.2/ 5

.026"12.7mm, ⌀14x1.25HR 11