Fram 5503 Copper Core Spark Plug with Resistor

The Fram 5503 is a copper core spark plug designed to deliver reliable ignition performance for a wide range of automotive applications. This traditional nickel electrode spark plug features a full copper core center electrode that provides superior thermal conductivity, improving resistance to fouling and ensuring consistent performance across all operating conditions.

Key Features:

• Full copper core electrode for enhanced thermal control and heat dissipation
• High nickel alloy center and ground electrodes for extended service life
• Projected tip design extends into combustion chamber for improved self-cleaning
• Built-in resistor (4k Ohm) reduces radio frequency interference and electrode erosion
• Multi-rib ceramic insulator provides superior insulation and prevents misfires
• Cold-formed steel shell with precision rolled threads for reliable installation
• Nickel-plated shell resists corrosion for long-term durability
• 14mm thread diameter with 19mm (3/4") reach and 5/8" hex size

Specifications:

• Thread: 14mm x 1.25mm pitch
• Seat Type: Gasket
• Gap: 0.045" (1.15mm)
• Heat Range: 2
• Terminal: Solid type
• Torque Specs: 26-29 lb-ft (cast iron), 15-22 lb-ft (aluminum)

This copper resistor spark plug is engineered to provide quick starts, improved fuel economy, and smooth acceleration. The copper-glass seal creates a gas-tight bond between the insulator and terminal post, ensuring full voltage delivery at the spark gap for reliable ignition in all conditions.