NGK Iridium IX BKR6EIX-11 Spark Plug 4-Pack — 14mm Thread, 19mm Reach, 0.6mm Iridium Tip

NGK BKR6EIX-11 Iridium IX is a four-pack of projected-tip iridium spark plugs engineered for precise ignition and long life in compatible gasoline engines.

This four-pack brings NGK's Iridium IX technology to vehicles that accept a 14mm thread, 19mm reach and a 0.6mm fine-wire center electrode. The plugs combine a projected, iridium-tipped center electrode with a single taper-cut nickel ground electrode and a factory-set 0.044" (1.1mm) gap. Designed to fit applications requiring a 14mm thread diameter, 1.25mm pitch and a 5/8" (16mm) hex, these are intended as direct-replacement components meeting the listed mechanical specifications.

What are the exact dimensions and mechanical specs of this NGK plug?

The BKR6EIX-11 uses a 14mm thread diameter with a 1.25mm pitch and 19mm (3/4") reach. It has a 5/8" (16mm) hex for wrenching and a gasket seat type with ISO overall height.

• Thread size: 14mm; thread pitch: 1.25mm
• Reach: 19mm (3/4"); seat: gasket
• Hex size: 5/8" (16mm); overall height: ISO

How is the electrode constructed and why does it matter?

The center electrode is a 0.6mm fine-wire iridium type that is projected from the insulator to improve ignition consistency. The ground electrode is a single nickel taper-cut design; this combination balances spark exposure and durability without changing engine components.

• Center electrode: 0.6mm iridium fine wire, projected
• Ground electrode: taper-cut nickel, single electrode
• Resistor included to reduce RF interference

What gap, heat range and terminal type should I expect?

Each plug comes pre-gapped to 0.044" (1.1mm) and is specified at NGK heat range 6. The terminal is a solid type suitable for standard ignition boots; no special terminal adapters are required where a solid terminal is specified.

• Gap: 0.044" (1.1mm) — factory pre-set
• Heat range: 6 (NGK scale)
• Terminal type: solid with built-in resistor

What should I consider before installing these plugs?

Confirm your vehicle's manufacturer-recommended plug thread size, reach, and heat range to ensure compatibility. Use proper torque and an anti-seize practice only if your service manual recommends it—NGK often supplies plugs with a coating and specified torque values to avoid over-tightening.

• Verify thread size (14mm) and reach (19mm) against OEM specs
• Use recommended torque and gap checks during installation
• Confirm heat range 6 is suitable for your engine application

Who is this for: Mechanics and DIY enthusiasts looking for a direct-replacement iridium spark plug in a four-pack for engines that require a 14mm threaded, 19mm reach plug with a projected 0.6mm iridium electrode. These plugs suit owners who want a fine-wire iridium tip for consistent spark performance and an NGK part that matches specific mechanical and electrical specs without modification.