Denso X16FSR-U Spark Plug

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Rating
Brand	Code
3.3 / 5 Overall
Denso	X16FSR-U
3.0 / 5 Materials
Copper	Copper
Ground electrode	Center electrode
4.0 / 5 Design
U-Groove	Standard
Ground type	Center type

Specifications
Gap	Heat range
0.7mm (.028")	16
⌀12mm	1.25mm
Thread diameter	Thread pitch
12.7mm (1/2")	18mm ()
Reach	Hex size
Gasket	Threaded Stud
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

DR5HS

Copper

2.9/ 5

.028"12.7mm, ⌀12x1.25HR 5

4173

Copper

2.9/ 5

.028"12.7mm, ⌀12x1.25HR 1

Deep reference (13)

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

242160500

Copper-Silver

3.5/ 5

.028"12.7mm, ⌀12x1.25HR 2

D8HV

Copper-Gold-Palladium

3.4/ 5

.020"12.7mm, ⌀12x1.25HR 8

X20FS-U

Copper

3.3/ 5

.028"12.7mm, ⌀12x1.25HR 20

X24FS-U

Copper

3.3/ 5

.028"12.7mm, ⌀12x1.25HR 24

4173

Copper

2.9/ 5

.028"12.7mm, ⌀12x1.25HR 1

P10Y

Copper

2.9/ 5

.024"12.7mm, ⌀12x1.25HR 10

P8Y

Copper

2.9/ 5

.026"12.7mm, ⌀12x1.25HR 8

D6HA

Copper

2.9/ 5

.028"12.7mm, ⌀12x1.25HR 6

D8HA

Copper

2.9/ 5

.028"12.7mm, ⌀12x1.25HR 8

DR4HS

Copper

2.9/ 5

.028"12.7mm, ⌀12x1.25HR 4

DR5HS

Copper

2.9/ 5

.028"12.7mm, ⌀12x1.25HR 5

DR6HS

Copper

2.9/ 5

.028"12.7mm, ⌀12x1.25HR 6

DR8HS

Copper

2.9/ 5

.028"12.7mm, ⌀12x1.25HR 8

One step colder (1)

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

X20FSRU

Copper

3.3/ 5

.028"12.7mm, ⌀12x1.25HR 20