NGK Standard Spark Plug 6993 (BKR6EKU), Copper Core, Semi-Surface Discharge Ground

The NGK 6993 is a Standard spark plug built on proven NGK technology for reliable, consistent ignition performance. It is treated with corrosion-resistant plating for easy installation and removal, and it uses a solid copper core center electrode for superior heat dissipation, strong conductivity, and a broad heat range. NGK Standard plugs have long served as an OE cornerstone, delivering decades of dependable performance across gasoline engines.

This plug features a Semi-Surface Discharge ground configuration paired with a nickel ground electrode and a nickel center electrode tip over a copper core, a combination designed to promote stable spark delivery. The 5/8 inch hex size matches standard spark plug sockets for straightforward service. Electrical resistance is rated at 5k Ohm to help suppress ignition noise.

Always check your engine's maintenance manual and confirm the correct plug against your engine manufacturer's recommendation before ordering, since using the wrong plug can reduce performance and fuel economy or cause engine damage.

Specifications

• Brand: NGK
• Manufacturer Part Number: 6993
• NGK Plug Designation: BKR6EKU
• UPC: 087295169933
• Electrical Resistance: 5k Ohm
• Ground Configuration: Semi-Surface Discharge
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Insulator Material: Ceramic
• Thread Size: 14mm x 1.25mm
• Hex Size: 5/8 inch
• Weight: 0.15 pounds
• Package Dimensions: 3.3 inches L x 0.6 inches H x 8 inches W
• Country of Origin: China

Frequently Asked Questions

What is the NGK 6993 spark plug? The NGK 6993 is a Standard spark plug (NGK plug designation BKR6EKU) with a solid copper core center electrode and a Semi-Surface Discharge ground configuration, built for reliable ignition performance.

What ground electrode design does this plug use? The NGK 6993 uses a Semi-Surface Discharge ground configuration with a nickel ground electrode, a design intended to promote stable, consistent spark delivery.

What materials are the electrodes made of? On the NGK 6993, the center electrode core is copper for strong heat dissipation and conductivity, while the center electrode tip and the ground electrode are both nickel.

What is the electrical resistance of this plug? The NGK 6993 is rated at 5k Ohm resistance, which helps suppress ignition noise.

What hex size wrench or socket fits this spark plug? The NGK 6993 has a 5/8 inch hex size, matching a standard spark plug socket.

What is the thread size of the NGK 6993? This spark plug has a 14mm x 1.25mm thread size.

How much does the NGK 6993 spark plug weigh? The NGK 6993 weighs 0.15 pounds.

Is the NGK 6993 a copper spark plug? Yes, the NGK 6993 uses a solid copper core in the center electrode, combined with a ceramic insulator body and nickel electrode surfaces.

Does corrosion-resistant plating come on this plug? Yes, the NGK 6993 is treated with corrosion-resistant plating to make installation and removal easier over the plug's service life.

How do I know if the NGK 6993 is the correct plug for my engine? Check your engine's maintenance manual and confirm against your engine manufacturer's recommended plug before ordering the NGK 6993, since installing the wrong plug can reduce performance, hurt fuel economy, or cause engine damage.

Is this a genuine NGK spark plug? Yes, the 6993 is a genuine NGK Standard series spark plug, part of NGK's long-running OE-grade plug lineup.

What ignition benefit does a broad heat range provide on this plug? The copper core in the NGK 6993 gives it a broad heat range along with strong heat dissipation, which supports consistent performance across varying engine operating conditions.