Bosch FR8DCX+ NS 7557 Spark Plug

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Rating
Brand	Code
2.9 / 5 Overall
Bosch	FR8DCX+ NS
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
2.8 / 5 Design
Standard	Standard
Ground type	Center type

Specifications
Gap	Heat range
1.1mm (.043")	8
⌀14mm	1.25mm
Thread diameter	Thread pitch
19mm (3/4")	16mm (5/8")
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

FR4

Copper

3.1/ 5

.039"19mm, ⌀14x1.25HR 4

Deep reference (5)

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

VK16

Iridium-Platinum

4.2/ 5

.043"19mm, ⌀14x1.25HR 16

Q16PR-U

Copper

3.3/ 5

.031"19mm, ⌀14x1.25HR 16

K16PR-U

Copper

3.3/ 5

.031"19mm, ⌀14x1.25HR 16

431S

Copper

2.9/ 5

.039"19mm, ⌀14x1.25HR 14

3926

Copper

2.9/ 5

.035"19mm, ⌀14x1.25HR 5

Same specs (5)

Products that have identical characteristics that impact interchangability

ZFR5AIX-11

Copper-Iridium

3.8/ 5

.043"19mm, ⌀14x1.25HR 5

FR8DPX+

Copper-Platinum

3.3/ 5

.043"19mm, ⌀14x1.25HR 8

FR8LPX+

Copper-Platinum

3.3/ 5

.043"19mm, ⌀14x1.25HR 8

FR8DPX

Copper-Platinum

3.3/ 5

.043"19mm, ⌀14x1.25HR 8

FR8LPX

Copper-Platinum

3.3/ 5

.043"19mm, ⌀14x1.25HR 8

Bigger gap (3)

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

89CC

Copper

2.9/ 5

.049"19mm, ⌀14x1.25HR 12

89C2

Copper

2.9/ 5

.049"19mm, ⌀14x1.25HR 12

RC12YC5

Copper

2.9/ 5

.049"19mm, ⌀14x1.25HR 12

One step colder (4)

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

FR7KPP30X

Copper-Platinum

3.5/ 5

.043"19mm, ⌀14x1.25HR 7

FR7DPX+

Copper-Platinum

3.3/ 5

.043"19mm, ⌀14x1.25HR 7

FR6DCX

Copper

2.9/ 5

.043"19mm, ⌀14x1.25HR 6

FR7DCX+ NS

Copper

2.9/ 5

.043"19mm, ⌀14x1.25HR 7