DENSO
More Information for DENSO 5304
{Alternate Inventory Numbers: IK20}
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DENSO 5304  
($5.40/Each)
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DENSO 5304 Specifications
Center Electrode Core MaterialCopper
Center Electrode Tip MaterialIridium
Gap Size1.1 (MM)
Ground ConfigurationStandard
Ground Electrode Core MaterialNickel
Ground Electrode Quantity1
Ground Electrode Tip DesignTapercut, U-Groove
Hex Size16.0 (MM)
Manufacturer Heat Range20
Reach19.00 (MM)
Resistance5000 (oh)
Seat TypeFlat
Thread Diameter14.00 (MM)
Iridium Power; Pre-Set Gap: 0.044"
Features & Benefits:
  • LIFESPAN / DURABILITY | Iridium alloy is 6X harder and 8X stronger than Platinum
    • Iridium with Rhodium Center Electrode -- has the highest concentration of Iridium of any spark plug and outperforms in the most severe engine temperatures, resisting oxidation and voltage wear for over 100,000 miles.
    • Patented 360-Degree Laser Welding -- creates the highest quality bond for structural support of the center electrode.
  • PERFORMANCE / IGNITABILITY ①
    • 0.4 mm Fine Wire Iridium Center Electrode -- achieves higher ignitability and requires lower spark voltage to enable high-response driving with fewer misfires. As a result, acceleration improves in comparison with normal plugs.
    • Tapered Cut Ground Electrode -- improves firing performance by reducing quenching.
  • EFFICIENCY / FUEL ECONOMY
    • Patented U-Groove ② Ground Electrode -- enables complete combustion by allowing the spark to fill the gap created by the U shape. The ball of fire created in the U-Groove develops a larger and hotter flash front that virtually eliminates excessive fouling and erratic starts caused by poor fuel mixtures.
①
Performance
②
Fuel Mileage
Which DENSO Spark Plug Is Right For You?

Material / Series Lifespan / Durability Performance / Ignitability Efficiency / Fuel Economy
Copper / Nickel U-Groove
U-Groove		 ★ ★ ★
Platinum Twin Tip
Platinum Twin-Tip		 ★★★★ ★★ ★★
Double Platinum
Double Platinum		 ★★★★★ ★★ ★★
Iridium Twin Tip
Iridium Twin Tip		 ★★★★★★ ★★★★ ★★★
Iridium Power
Iridium Power		 ★★★★ ★★★★★ ★★★
Iridium Long Life
Iridium Long Life		 ★★★★★★ ★★★★ ★★
Videos

How To Replace DENSO Spark Plugs

Additional Resources

More Information about Iridium Power Features and Structure
OEM / Interchange Numbers: 000018BP03, 0031597503, 0031597803, 0041591403, 06H905601A, 06H905611, 06H905621, 0948200427, 0948200429, 0948200494, 0948200508, 0948200510, 0948200548, 0948200550, 0K01C18110, 0K23A18110, 0K2AA18110, 101000003AB, 101000004AA, 101000004AB, 101000016AA, 101000033AA, 101000035AA, 101000035AB, 101000035AH, 101000035HJ, 101000041AC, 101000051AA, 101000054AD, 101000063AA, 101000063AC, 101905607, 101905611, 101905611A, 101905615A, 101905616, 101905621A, 101905621B, 101905631B, 101905631H, 101905640, 101905640A, 101905640D, 1110985Z00, 1110985Z10, 1110986Z20, 12120030548, 12120037607, 12120037608, 12120141871, 12129059209, 12129059795, 12129063428, 12129064617, 12129064619, 12129069877, 12129071003, 12610767, 12787099, 1822A002, 1822A069, 1881408061, 1881411062, 1882311091, 19185432, 19302724, 224010B016, 224011P116, 224011W616, 2240120J06, 2240127N16, 2240127N66, 2240140P16, 2240140P66, 2240150Y06, 2240153J06, 224017B006, 2240185E16, 2240197E16, 2240197E66, 224019E016, 22401AA310, 22401AA370, 22401AA450, 22401AA530, 22401AA531, 22401AA540, 22401AA550, 22401AA65A, 22401AA730, 22401AA731, 242229606, 25108074, 2723440, 2740018110, 307313830, 32000118, 32009439, 33003862, 4444741, 4501029, 4671057, 5159713AA, 5269556, 5269897, 5269899, 55564215, 55564962, 55571391, 55580961, 55585534, 5614257, 8251080740, 86426600, 86920700, 86920710, 88901007, 88969636, 88969637, 8943283720, 8943283740, 8970129280, 8970129300, 9008091116, 9008091180, 9008091181, 9091901166, 9091901178, 9091901179, 9091901180, 909190118083, 9091901194, 9091901195, 9091901210, 9091901211, 9091901237, 90919C1001, 90919C2002, 91171719, 91173854, 9146367, 9188681, 9195109, 9399866, 94328372, 94849777, 96068562, 96068563, 96068564, 96130723, 980795614H, 980795614J, 980795615H, 980795615J, 9807956A5H, 9807956A7H, 9807956A7S, 99917010390, 99917019290, 99917019590, 99917020190, 99917020490, 99917020491, 99917020791, 99917021090, 99917021890, 99917022190, 99917022790, BP0318110, BP0418110, BP1218110, EBC11480, EBC8143, JE4318110, JE4418110, M04671057, M05269899, MD313443, MD321878, MD322771, MD378582, MN119487, MN163236, MN163807, MR984646, MR984943, MS851336, MS851502, S2000RC9YC, SP000RC9YC, SP0RC8PYP4, XP3923, XS3923, ZAP121200, ZVP121086C

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