NGK knows that the needs for industrial spark plugs require quality, reliability and durability. Designed with reliable technology and OE quality production, AS3-25 are commercial grade plugs for landfill, bio gas, oil and gas, and power generation industries.

The NGK Difference

  • Durable Terminal & Resistor
  • Patented Insulators
  • Stainless Steel Gasket
  • Extreme Durable Thread and Plating
  • Triple Seating Technology
  • Solid Copper Core

Efficient Design Features

Laser-Weld Precious Metal Tip
NGK’s superior welding technology guarantees stable longevity.

New Generation Precious Metal
Provides superior resistance against electrode wear in high combustion temperature environments.

Electrode Dimensions:
1.6mm center electrode tip
1.8mm square ground electrode pad


Cross References