NGK R5525-8 Spark Plug

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Rating
Brand	Code
3.2 / 5 Overall
NGK	R5525-8
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")	8
⌀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

IWF24

Copper-Iridium

4.3/ 5

.031"12.7mm, ⌀14x1.25HR 24

Deep reference (23)

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

XS4093

Iridium-Platinum

4.2/ 5

.031"12.7mm, ⌀14x1.25HR 4

BPR8HIX

Copper-Iridium

3.8/ 5

.031"12.7mm, ⌀14x1.25HR 8

BR8HIX

Copper-Iridium

3.8/ 5

.031"12.7mm, ⌀14x1.25HR 8

BU8H

Copper

3.2/ 5

.016"12.7mm, ⌀14x1.25HR 8

BUZ8H

Copper

3.2/ 5

.016"12.7mm, ⌀14x1.25HR 8

QL16V

Copper

3.2/ 5

.059"12.7mm, ⌀14x1.25HR 16

W4AC

Copper

2.9/ 5

.020"12.7mm, ⌀14x1.25HR 4

B8HS

Copper

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 8

BP8HS

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

BP8HS-10

Copper

2.9/ 5

.039"12.7mm, ⌀14x1.25HR 8

BP8HS-15

Copper

2.9/ 5

.059"12.7mm, ⌀14x1.25HR 8

BPR8HS

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

BR8HS

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

BR8HSA

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 8

4092

Copper

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 2

411

Copper

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 1

L78C

Copper

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 78

QL78C

Copper

2.9/ 5

.030"12.7mm, ⌀14x1.25HR 78

QL78YC

Copper

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 78

UL81C

Copper

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 81

275

Copper

2.9/ 5

.024"12.7mm, ⌀14x1.25HR 6

4093

Copper

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 4

4123

Copper

2.9/ 5

.028"12.7mm, ⌀14x1.25HR 4

One step colder (1)

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

R5525-9

Copper

3.2/ 5

.026"12.7mm, ⌀14x1.25HR 9

Two steps colder (1)

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

R5525-10

Copper

3.2/ 5

.026"12.7mm, ⌀14x1.25HR 10