HKS 50003-M50RE M-Series Super Fire Racing Iridium Spark Plug

The HKS Super Fire Racing M-Series Spark Plug (PN: 50003-M50RE) is a high-performance iridium plug engineered for demanding, high-load applications. Sold individually, this plug is purpose-built to deliver reliable ignition, exceptional durability, and resistance to carbon buildup under the stress of aggressive tuning and spirited driving.

M-Series Super Fire Racing — Key Features:

• 0.6mm Iridium Alloy Center Electrode — fine-wire iridium alloy construction provides a focused spark with outstanding longevity
• Platinum-Tipped Outer Electrode — platinum chip on the ground electrode enhances durability and wear resistance
• Short-Type Outer Electrode (Anti-Vibration) — compact outer electrode geometry reduces vibration stress for extended service life
• Thermal Edge Design — optimized heat dissipation to maintain ideal operating temperature under high-load conditions
• Spark Support Gap — engineered gap geometry supports consistent, reliable ignition across all RPM ranges
• Nickel-Coated Housing — protective nickel coating on the shell guards against premature corrosion and deterioration

Iridium alloy is the material of choice for this plug due to its extraordinary hardness and thermal resilience. With a melting point of 2,454°C — far exceeding the 1,769°C of white gold — the center electrode withstands extreme combustion chamber temperatures, high compression, and minor detonation events without degradation. This allows the use of a fine 0.6mm electrode tip without sacrificing plug longevity.

The M-Series is specifically recommended for high-load performance applications where reliable ignition, long service intervals, and anti-carbon buildup performance are critical. Available in colder heat ranges (heat range 7 and above for most applications; heat range 9 and above for rotary engines), these plugs are an ideal upgrade for turbocharged, supercharged, and other modified powerplants.

Note: Sold individually. Verify heat range and thread specifications for your specific application before ordering.