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NGK Iridium IX Spark Plugs


NGK Spark Plugs
NGK Iridium IX Spark Plugs

Product images may differ from actual product appearance.

The Plug for Serious Enthusiasts
Iridium has a very high melting point that's perfect for high-performance, high-tech engines. It is stronger than any other metal used in spark plugs.

  • Ultra-fine electrode (thin enough for spark consistency & accuracy, thick enough for max durability & longevity)
  • Reduces spark voltage requirement
  • Fuel efficiency & extreme ignitability
  • Improved throttle response
  • Outstanding acceleration
  • Superior antifouling, anticorrosion, and antiseizing properties
  • Quality NGK Spark Plugs
  • Sold individually


  • 17 Products
    Extra Hot Heat Range
    NGK Spark Plugs LZTR4AIX-11 -
    739-LZTR4AIX-11
    Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • .044" Gap
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs UR4IX -
    739-UR4IX
    Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • Sold Individually
  • $10.99
    Ships
    Hot Heat Range
    NGK Spark Plugs BKR5EIX-11 -
    739-BKR5EIX-11
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
  • .044" Gap
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs UR5IX -
    739-UR5IX
    Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • Sold Individually
  • $10.99
    Ships
    Hot-Medium Heat Range
    NGK Spark Plugs IZFR6J -
    739-IZFR6J
    Iridium IX Spark Plug
  • 14mm x 0.750" reach
  • 5/8" hex
  • Resistor
  • Gasket Seat
  • $11.99
    Ships
    NGK Spark Plugs LTR6IX-11 -
    739-LTR6IX-11
    Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .044" Gap
  • Sold Individually
  • $10.99
    Ships
    Medium Heat Range
    NGK Spark Plugs BKR7EIX-11 -
    739-BKR7EIX-11
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
  • .044" Gap
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs DCPR7EIX -
    739-DCPR7EIX
    Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 5/8" Hex
  • Projected
  • Gasket seat
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs LTR7IX-11 -
    739-LTR7IX-11
    Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .044" Gap
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs LZTR7AIX-13 -
    739-LZTR7AIX-13
    Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • .052" Gap
  • Sold Individually
  • $10.99
    Order Today Ships 02/15/16
    NGK Spark Plugs TR7IX -
    739-TR7IX
    Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • Sold Individually
  • $10.99
    Ships
    Medium-Cold Heat Range
    NGK Spark Plugs BKR8EIX -
    739-BKR8EIX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs BR8ECMIX -
    739-BR8ECMIX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Compact
  • Gasket seat
  • Sold Individually
  • $11.99
    Order Today Ships 02/18/16
    NGK Spark Plugs TR8IX -
    739-TR8IX
    Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • Sold Individually
  • $10.99
    Ships
    Cold Heat Range
    NGK Spark Plugs BPR9EIX -
    739-BPR9EIX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs BR9ECMIX -
    739-BR9ECMIX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Compact
  • Gasket seat
  • Sold Individually
  • $11.99
    Order Today Ships 02/18/16
    NGK Spark Plugs DCPR9EIX -
    739-DCPR9EIX
    Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 5/8" Hex
  • Projected
  • Gasket seat
  • Sold Individually
  • $10.99
    Ships

    17 Products