NGK Standard Spark Plug 5139 - JR8C

Multi-Ground Electrodes Improve Ignition Capabilities and are Less Sensitive to Increased Voltage Requirements Due to Gap Growth.

Designed to Specific Manufacturer Ignition Requirements, NGK's Multi-Ground Plugs Maintain All the Features of Their Standard Plugs, Including:

• Corrugated Ribs to Prevent Flashover
• Pure Alumina Silicate Ceramic Insulator, Providing Superior Strength and Better Heat Transfer
• Copper Core to Aid in Heat Removal
• Triple Seals to Prevent Leakage
• Sold individually

Features

• Multi-Ground
• Corrugated Ribs
• Copper Core

Shell

• Thread Size: 12mm
• Thread Pitch: 1.25mm
• Seat Type: Gasket
• Resistor: Yes
• Resistor Value: 5K Ohm
• Reach: 19mm (3/4")
• Hex Size: 18mm
• Terminal Type: Threaded Stud
• Overall Height: ISO
• Gap:. 028" (0.7mm)

Center Electrode

• Material: Nickel
• Type: Standard
• Size: 2.5mm
• Projection: Projected

Ground Electrode

• Material: Nickel
• Type: Multi-Ground
• Quantity: 2

Specifications

• Torque Specs: Cast Iron: 10.8-18 lb. ft. Aluminum: 10.8-14.5 lb. ft.
• Brand: NGK
• Heat Range: 8
• Longevity: 30k