NGK Spark Plug Stock # 5777

The NGK Spark Plug Stock # 5777 (BUR9EQ) is a premium resistor spark plug engineered for reliable ignition across a wide range of automotive applications. Featuring a 14mm thread diameter and 21.5mm reach with gasket seat design, this spark plug delivers consistent performance in standard engine configurations where OEM-equivalent specifications are required.

The resistor design suppresses radio frequency interference, protecting sensitive vehicle electronics while maintaining optimal spark efficiency. The 21.5mm reach ensures proper electrode positioning within the combustion chamber—critical for complete fuel ignition and emissions control. The gasket seat provides a reliable seal against the cylinder head, preventing combustion gases from escaping around the plug body. NGK's manufacturing standards ensure precise gap tolerances and ceramic insulation quality that withstand extended heat cycles without degradation.

This spark plug suits engine maintenance and replacement applications where OEM specifications call for a 14mm thread, 21.5mm reach design. Fleet operators, independent mechanics, and DIY enthusiasts rely on NGK plugs for dependable cold-start performance and steady-state combustion across varying driving conditions. The BUR9EQ model serves as a direct replacement in vehicles originally equipped with this specification, eliminating guesswork during service intervals.

NGK spark plugs are recognized across the automotive aftermarket for manufacturing consistency and thermal range accuracy. The NGK BUR9EQ maintains the resistor technology standard in modern engines, offering a cost-effective alternative to premium iridium designs while preserving ignition reliability in standard operating scenarios. Each plug is individually boxed to prevent damage during storage and installation.