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
  • Sold individually



    		•
    Extra Hot Heat Range
      739-BKR4EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-GR4IX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-LZTR4AIX-11
    		Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • .044" Gap
    		• $7.99
    Ships
    in 3 days
      739-TR4IX
    		Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
    		• $7.99
    Ships
    Monday
      739-UR45IX
    		Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .059" Gap
    		• $7.99
    Ships
    in 3 days
      739-UR4IX
    		Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
    		• $7.99
    Ships
    in 3 days
      739-XR45IX
    		Iridium IX Spark Plug
  • 14mm x 3/8" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • .059" Gap
    		• $7.99
    Ships
    in 3 days
      739-XR4IX
    		Iridium IX Spark Plug
  • 14mm x 3/8" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    Monday
    Hot Heat Range
      739-BCPR5EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • JIS projected
  • Gasket seat
    		• $6.99
    Ships
    Monday
      739-BCPR5EIX-11
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • JIS projected
  • Gasket seat
  • .044" Gap
    		• $7.99
    Ships
    in 3 days
      739-BKR5EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-BKR5EIX-11
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
  • .044" Gap
    		• $7.99
    Ships
    Monday
      739-BPR5EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-BPR5EIX-11
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • .044" Gap
    		• $7.99
    Ships
    in 3 days
      739-CR5HIX
    		Iridium IX Spark Plug
  • 10mm x 1/2" Reach
  • 5/8" Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-GR5IX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-LFR5AIX-11
    		Iridium IX Spark Plug
  • 14mm x 26.5mm Reach
  • 5/8" Hex
  • Projected
  • Gasket seat
  • .044" Gap
    		• $8.99
    Ships
    Monday
      739-LTR5IX-11
    		Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .044" Gap
    		• $7.99
    Ships
    in 3 days
      739-LZTR5AIX-13
    		Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • .052" Gap
    		• $7.99
    Ships
    in 7 days
      739-TR5-1IX
    		Iridium IX Spark Plug
  • 14mm x .807" Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
    		• $7.99
    Ships
    Monday
      739-TR55-1IX
    		Iridium IX Spark Plug
  • 14mm x .807" Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • .059" Gap
    		• $7.99
    Ships
    Monday
      739-TR55IX
    		Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .059" Gap
    		• $7.99
    Ships
    Monday
      739-TR5IX
    		Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
    		• $7.99
    Ships
    in 3 days
      739-UR55IX
    		Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .059" Gap
    		• $7.99
    Ships
    in 3 days
      739-UR5IX
    		Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
    		• $7.99
    Ships
    Monday
      739-WR5IX
    		Iridium IX Spark Plug
  • 18mm x .460" Reach
  • 13/16" Hex
  • Projected
  • Tapered seat
    		• $7.99
    Ships
    in 3 days
      739-XR5IX
    		Iridium IX Spark Plug
  • 14mm x 3/8" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-YR55IX
    		Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Tapered seat
  • .059" Gap
    		• $7.99
    Ships
    in 3 days
      739-YR5IX
    		Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Tapered seat
    		• $7.99
    Ships
    in 3 days
      739-ZFR5FIX-11
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO extended projection
  • Gasket seat
  • .044" Gap
    		• $7.99
    Ships
    Monday
    Hot-Medium Heat Range
      739-BCPR6EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • JIS projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-BCPR6EIX-11
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • JIS projected
  • Gasket seat
  • .044" Gap
    		• $7.99
    Ships
    in 3 days
      739-BKR6EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-BKR6EIX-11
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
  • .044" Gap
    		• $7.99
    Ships
    Monday
      739-BPR6EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-BPR6EIX-11
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • .044" Gap
    		• $7.99
    Ships
    Monday
      739-BPR6HIX
    		Iridium IX Spark Plug
  • 14mm x 1/2" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-BR6FIX
    		Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Tapered seat
    		• $7.99
    Ships
    in 3 days
      739-BR6HIX
    		Iridium IX Spark Plug
  • 14mm x 1/2" Reach
  • 13/16" Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-CR6HIX
    		Iridium IX Spark Plug
  • 10mm x 1/2" Reach
  • 5/8" Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-LFR6AIX-11
    		Iridium IX Spark Plug
  • 14mm x 26.5mm Reach
  • 5/8" Hex
  • Projected
  • Gasket seat
  • .044" Gap
    		• $8.99
    Ships
    Monday
      739-LTR6IX-11
    		Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .044" Gap
    		• $8.99
    Ships
    in 3 days
      739-LZTR6AIX-13
    		Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • .052" Gap
    		• $7.99
    Ships
    in 3 days
      739-TR6IX
    		Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
    		• $8.99
    Ships
    Monday
      739-UR6IX
    		Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
    		• $7.99
    Ships
    in 3 days
      739-ZFR6FIX-11
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO extended projection
  • Gasket seat
  • .044" Gap
    		• $7.99
    Ships
    Monday
    Medium Heat Range
      739-BCPR7EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • JIS projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-BCPR7EIX-11
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • JIS projected
  • Gasket seat
  • .044" Gap
    		• $8.99
    Ships
    in 3 days
      739-BKR7EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
    		• $8.99
    Ships
    in 3 days
      739-BKR7EIX-11
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
  • .044" Gap
    		• $7.99
    Ships
    in 3 days
      739-BPR7EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-BPR7HIX
    		Iridium IX Spark Plug
  • 14mm x 1/2" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-BR7EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-BR7HIX
    		Iridium IX Spark Plug
  • 14mm x 1/2" Reach
  • 13/16" Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-CR7EIX
    		Iridium IX Spark Plug
  • 10mm x 3/4" Reach
  • 5/8" Hex
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-CR7HIX
    		Iridium IX Spark Plug
  • 10mm x 1/2" Reach
  • 5/8" Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-DCPR7EIX
    		Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 5/8" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-DPR7EIX-9
    		Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 18mm Hex
  • Projected
  • Gasket seat
  • .036" Gap
    		• $7.99
    Ships
    Monday
      739-DR7EIX
    		Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 18mm Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-LFR7AIX
    		Iridium IX Spark Plug
  • 14mm x 26.5mm Reach
  • 5/8" Hex
  • Projected
  • Gasket seat
    		• $8.99
    Ships
    in 3 days
      739-LTR7IX-11
    		Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .044" Gap
    		• $8.99
    Ships
    in 3 days
      739-LZTR7AIX-13
    		Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • .052" Gap
    		• $8.99
    Ships
    11/24/09
      739-TR7IX
    		Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
    		• $8.99
    Ships
    in 3 days
    Medium-Cold Heat Range
      739-BKR8EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
    		• $8.99
    Ships
    in 3 days
      739-BPR8EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $12.99
    Ships
    Monday
      739-BPR8HIX
    		Iridium IX Spark Plug
  • 14mm x 1/2" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-BR8ECMIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Compact
  • Gasket seat
    		• $11.99
    Ships
    in 3 days
      739-BR8EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-BR8HIX
    		Iridium IX Spark Plug
  • 14mm x 1/2" Reach
  • 13/16" Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-CR8EHIX-9
    		Iridium IX Spark Plug
  • 10mm x 3/4" Reach
  • 5/8" Hex (partial thread)
  • Gasket seat
  • .036" Gap
    		• $7.99
    Ships
    Monday
      739-CR8EIX
    		Iridium IX Spark Plug
  • 10mm x 3/4" Reach
  • 5/8" Hex
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-CR8HIX
    		Iridium IX Spark Plug
  • 10mm x 1/2" Reach
  • 5/8" Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-DCPR8EIX
    		Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 5/8" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-DPR8EIX-9
    		Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 18mm Hex
  • Projected
  • Gasket seat
  • .036" Gap
    		• $7.99
    Ships
    Monday
      739-DR8EIX
    		Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 18mm Hex
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-TR8IX
    		Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
    		• $8.99
    Ships
    in 3 days
    Cold Heat Range
      739-BKR9EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
    		• $8.99
    Ships
    in 3 days
      739-BPR9EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-BR9ECMIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Compact
  • Gasket seat
    		• $17.99
    Ships
    in 3 days
      739-BR9EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Gasket seat
    		• $8.99
    Ships
    in 3 days
      739-BR9HIX
    		Iridium IX Spark Plug
  • 14mm x 1/2" Reach
  • 13/16" Hex
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-CR9EHIX-9
    		Iridium IX Spark Plug
  • 10mm x 3/4" Reach
  • 5/8" Hex (partial thread)
  • Gasket seat
  • .036" Gap
    		• $7.99
    Ships
    in 3 days
      739-CR9EIX
    		Iridium IX Spark Plug
  • 10mm x 3/4" Reach
  • 5/8" Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-DCPR9EIX
    		Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 5/8" Hex
  • Projected
  • Gasket seat
    		• $7.99
    Ships
    Monday
      739-DPR9EIX-9
    		Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 18mm Hex
  • Projected
  • Gasket seat
  • .036" Gap
    		• $7.99
    Ships
    in 3 days
      739-DR9EIX
    		Iridium IX Spark Plug
  • 12mm x 3/4" Reach
  • 18mm Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
    Extra Cold Heat Range
      739-BR10ECMIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Compact
  • Gasket seat
    		• $17.99
    Ships
    in 3 days
      739-BR10EIX
    		Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days
      739-BR10HIX
    		Iridium IX Spark Plug
  • 14mm x 1/2" Reach
  • 13/16" Hex
  • Gasket seat
    		• $7.99
    Ships
    in 3 days

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