Bosch 79169 Copper Nickel Spark Plug - USR7AC Pack of 10

The Bosch 79169 (USR7AC) is an OE-quality copper core spark plug designed for reliable ignition performance in small engines and select automotive applications. This 10-pack provides excellent value for professional shops and DIY enthusiasts maintaining multiple pieces of equipment.

Key Features:

• Yttrium-enhanced nickel-copper center electrode delivers up to 50% longer service life compared to standard copper plugs
• Copper core provides broader heat range to resist pre-ignition, fouling, and deposit build-up
• Nickel-plated rolled threads offer superior corrosion resistance and eliminate the need for anti-seize compound
• Angular ribbed insulator design prevents flashover and current leakage for reliable starts
• Metal-glass fused resistor (6K Ohm) maximizes interference suppression
• Projected center electrode design improves combustion efficiency

Specifications:

• Thread Size: 10mm x 1.0mm pitch
• Reach: 12.7mm (1/2")
• Hex Size: 5/8" (16mm)
• Gap: 0.020" (0.5mm)
• Seat Type: Gasket
• Heat Range: 7
• Resistor: Yes (6K Ohm)
• Torque Specs: 7.5-11 lb-ft (cast iron or aluminum)

Engineered to meet or exceed Original Equipment specifications, the Bosch 79169 replaces OEM part numbers 0242035503 and 0242.035.503-879. Commonly used in Stihl trimmers and edgers including FC90, FC95, FC100, FC110, FS90R, FS100ARX, FS110, FX130, and HT100 models.