Denso 3139 K20R-U11 Nickel U-Groove Spark Plug

Denso U-Groove spark plugs feature a u-shaped groove in the ground electrode, giving the flame a groove to grow in, resulting in less flame dissipation and a larger flame front for a more complete combustion. This translates to better fuel efficiency and improved throttle response. Machine rolled threads prevent seizing or cross threading during installation and removal. 100% pre-fired to assure the highest quality possible. Purified alumina powder insulator provides exceptional strength and thermal conductivity. Five rib insulator prevents flashover. Copper-glass seal bonds center electrode and insulator for a gas-tight seal.

• Shell
• Thread Diameter14mm
• Thread Pitch1.25mm
• Seat TypeGasket
• Reach19mm (3/4")
• Hex Size5/8" (16mm)
• Terminal TypeSolid
• Overall HeightISO
• Gap.043" (1.1mm)

• Center Electrode
• MaterialNickel
• TypeStandard
• Size2.5mm
• ProjectionProjected

• Ground Electrode
• MaterialNickel
• TypeU-Groove
• Quantity1

• Specifications
• ResistorYes
• Resistor Value5k Ohm
• Heat Range20
• Torque SpecsCast Iron: 26-30 lb. ft. Aluminum: 15-22 lb. ft.

• Part Information
• BrandDenso
• Warranty12 Months
• Longevity20-30k Miles

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