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NGK Spark Plugs

NGK Iridium IX Spark Plugs

4.86 out of 5 stars 252 Customer Reviews

NGK Iridium IX spark plugs feature an ultra-fine center electrode that's designed just thick enough to ensure the maximum durability and life of the spark plugs—and just thin enough to create an accurate and consistent spark. They represent the ultimate evolution of spark plug technology and performance. Iridium is the hardest metal used in spark plugs today—six times harder than platinum. This allowed NGK engineers to reduce the voltage requirement for a spark. Iridium IX plugs are available in more than a hundred configurations for universal and vehicle-specific applications.

Showing In Stock Items. Show All 12 Items.

Results 1 - 10 of 10

NGK Iridium IX Spark Plugs LFR6AIX-11

NGK Iridium IX Spark Plugs LFR6AIX-11

NGK Iridium IX Spark Plugs LFR6AIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, 1.043 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-6619

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 3/9/2026 if shipped by air

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Estimated Ship Date: Monday 3/9/2026 if shipped by air

NGK Iridium IX Spark Plugs BKR6EIX-11

NGK Iridium IX Spark Plugs BKR6EIX-11

NGK Iridium IX Spark Plugs BKR6EIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-3764

4.8 out of 5 stars ( 10 )

Estimated Ship Date: Monday 3/9/2026 if shipped by air

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Estimated Ship Date: Monday 3/9/2026 if shipped by air

NGK Iridium IX Spark Plugs LKR7DIX-11S

NGK Iridium IX Spark Plugs LKR7DIX-11S

NGK Iridium IX Spark Plugs LKR7DIX-11S

Spark Plug, IX Iridium, 12mm Thread, 1.040 in. Reach, 5/8 in. Hex, Gasket Seat, Resistor, Each

Part Number: NGK-93175

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Monday 3/9/2026 if shipped by air

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Estimated Ship Date: Monday 3/9/2026 if shipped by air

NGK Iridium IX Spark Plugs BKR5EIX-11

NGK Iridium IX Spark Plugs BKR5EIX-11

NGK Iridium IX Spark Plugs BKR5EIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-5464

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Monday 3/9/2026 if shipped by air

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Estimated Ship Date: Monday 3/9/2026 if shipped by air

NGK Iridium IX Spark Plugs BKR7EIX-11

NGK Iridium IX Spark Plugs BKR7EIX-11

NGK Iridium IX Spark Plugs BKR7EIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-6988

Not Yet Reviewed

Estimated Ship Date: Monday 3/9/2026 if shipped by air

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Estimated Ship Date: Monday 3/9/2026 if shipped by air

NGK Iridium IX Spark Plugs LKAR7BIX-11S

NGK Iridium IX Spark Plugs LKAR7BIX-11S

NGK Iridium IX Spark Plugs LKAR7BIX-11S

Spark Plugs, Iridium IX, Flat Seat, 12mm Thread, 26.5mm Reach, Each

Part Number: NGK-93501

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Monday 3/9/2026 if shipped by air

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Estimated Ship Date: Monday 3/9/2026 if shipped by air

NGK Iridium IX Spark Plugs ZFR6FIX-11

NGK Iridium IX Spark Plugs ZFR6FIX-11

NGK Iridium IX Spark Plugs ZFR6FIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-6441

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Monday 3/9/2026 if shipped by air

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Estimated Ship Date: Monday 3/9/2026 if shipped by air

NGK Iridium IX Spark Plugs ZFR5FIX-11

NGK Iridium IX Spark Plugs ZFR5FIX-11

NGK Iridium IX Spark Plugs ZFR5FIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Iridium, Each

Part Number: NGK-2477

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Monday 3/9/2026 if shipped by air

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Estimated Ship Date: Monday 3/9/2026 if shipped by air

NGK Iridium IX Spark Plugs ZFR6AIX-11S

NGK Iridium IX Spark Plugs ZFR6AIX-11S

NGK Iridium IX Spark Plugs ZFR6AIX-11S

Spark Plug, IX Iridium, 14mm Thread, 0.750 in. Reach, 5/8 in. Hex, Gasket Seat, Resistor, Each

Part Number: NGK-97138

Not Yet Reviewed

Estimated Ship Date: Monday 3/9/2026 if shipped by air

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Estimated Ship Date: Monday 3/9/2026 if shipped by air

NGK Iridium IX Spark Plugs ZFR5AIX-11

NGK Iridium IX Spark Plugs ZFR5AIX-11

NGK Iridium IX Spark Plugs ZFR5AIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, 0.750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-94553

Not Yet Reviewed

Estimated Ship Date: Monday 3/9/2026 if shipped by air

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Estimated Ship Date: Monday 3/9/2026 if shipped by air

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