Autolite APP646 Double Platinum Spark Plug

The Autolite APP646 Double Platinum spark plug features a platinum-to-platinum design that decreases gap erosion, reduces misfires, and provides improved durability, leading to longer service life. This spark plug provides superior performance over copper and standard platinum plugs and is primarily used in distributorless ignition system (DIS) engines.

Key Features:

• Platinum-to-platinum design prevents gap erosion and extends spark plug life
• Yttrium-enhanced ground electrode delivers superior heat transfer for greater durability under high temperatures and pressure
• Necked-down center electrode fires quicker and cleaner with less voltage for easier starts and quicker acceleration
• Full copper core electrode provides better performance in all conditions
• High alumina ceramic insulator provides optimum thermal conductivity and dielectric strength
• Multi-rib insulator prevents flash-over
• Mid-projection center electrode with flat seat type ensures consistent ignition
• Built-in resistor for noise suppression

Specifications:

• Thread Size: 14mm x 1.25
• Reach: 0.708 inches
• Hex Size: 13/16 inch (21mm)
• Gap: 0.050 inch (1.3mm) - Factory preset
• Seat Style: Gasket (flat seat)
• Insulator Type: Mid-projection ceramic

Get up to 3X longer service life compared to standard copper plugs. Backed by a 5-year limited warranty. Autolite has been a trusted name in spark plug manufacturing since 1936, providing OE-quality ignition components for virtually every vehicle on the road today.