NGK R5525-10 Spark Plug

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Rating

3.2 / 5 Overall
NGK	R5525-10
Brand	Code
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
3.5 / 5 Design
Standard	Fine Wire
Ground type	Center type

Specifications

0.65mm (.026")	10
Gap	Heat range
⌀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

Bigger gap (1)

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

L55C

Copper

2.9/ 5

.031"12.7mm, ⌀14x1.25HR 55

One step colder (1)

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

R5525-11

Copper

-

3.2/ 5

.026"12.7mm, ⌀14x1.25HR 11