Compare Autolite Xtreme Start Spark Plug - XST254DP Part #: XST254DP Line: ATO Autolite Xtreme Start Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14-1.25 Heat Range: 9 Hex Size (mm): 19mm Hex Size (in): 3/4 Inch Preset Gap (in): 0.030 Inch Preset Gap (mm): 0.8mm Thread Reach (in): 0.374 Inch Center Electrode Core Material: Nickel Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 1000 Ohm Insulator Height (mm): 40.4mm Insulator Height (in): 1.592 Inch Ground Electrode Tip Material: Nickel Thread Reach (mm): 9mm Metallurgy: Iridium Show More Show Less
Compare Autolite Xtreme Start Spark Plug - XST255DP Part #: XST255DP Line: ATO Autolite Xtreme Start Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14-1.25 Heat Range: 8 Hex Size (mm): 19mm Hex Size (in): 3/4 Inch Preset Gap (in): 0.030 Inch Preset Gap (mm): 0.76mm Thread Reach (in): 0.374 Inch Center Electrode Core Material: Nickel Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 1000 Ohm Insulator Height (mm): 40.4mm Insulator Height (in): 1.590 Inch Ground Electrode Tip Material: Nickel Thread Reach (mm): 9mm Metallurgy: Iridium Show More Show Less
Compare Autolite Xtreme Start Spark Plug - XST258DP Part #: XST258DP Line: ATO Autolite Xtreme Start Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14-1.25 Heat Range: 2 Hex Size (mm): 19mm Hex Size (in): 3/4 Inch Preset Gap (in): 0.025 Inch Preset Gap (mm): 0.64mm Thread Reach (in): 0.374 Inch Center Electrode Core Material: Nickel Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 1 Ohm Insulator Height (mm): 43.5mm Insulator Height (in): 1.711 Inch Ground Electrode Tip Material: Nickel Thread Reach (mm): 9mm Metallurgy: Iridium Show More Show Less
Compare Autolite Xtreme Start Spark Plug - XST2956DP Part #: XST2956DP Line: ATO Autolite Xtreme Start Spark Plug 2 Year LIMITED WARRANTY Seat: Tapered Thread Size: M14-1.25 Heat Range: 8 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.025 Inch Preset Gap (mm): 0.64mm Thread Reach (in): 0.305 Inch Center Electrode Core Material: Nickel Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 1000 Ohm Insulator Height (mm): 35.3mm Insulator Height (in): 1.391 Inch Ground Electrode Tip Material: Nickel Thread Reach (mm): 7.75mm Metallurgy: Iridium Show More Show Less
Compare Autolite Xtreme Start Spark Plug - XST2974DP Part #: XST2974DP Line: ATO Autolite Xtreme Start Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14-1.25 Heat Range: 11 Hex Size (mm): 19mm Hex Size (in): 3/4 Inch Preset Gap (in): 0.025 Inch Preset Gap (mm): 0.64mm Thread Reach (in): 0.374 Inch Center Electrode Core Material: Nickel Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 1000 Ohm Insulator Height (mm): 40mm Insulator Height (in): 1.573 Inch Ground Electrode Tip Material: Nickel Thread Reach (mm): 9mm Metallurgy: Iridium Show More Show Less
Compare Autolite Xtreme Start Spark Plug - XST2976DP Part #: XST2976DP Line: ATO Autolite Xtreme Start Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14-1.25 Heat Range: 8 Hex Size (mm): 19mm Hex Size (in): 3/4 Inch Preset Gap (in): 0.025 Inch Preset Gap (mm): 0.64mm Thread Reach (in): 0.374 Inch Center Electrode Core Material: Nickel Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 1000 Ohm Insulator Height (mm): 40mm Insulator Height (in): 1.574 Inch Ground Electrode Tip Material: Nickel Thread Reach (mm): 9mm Metallurgy: Iridium Show More Show Less
Compare Autolite Xtreme Start Spark Plug - XST3924DP Part #: XST3924DP Line: ATO Autolite Xtreme Start Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14-1.25 Heat Range: 9 Hex Size (mm): 16mm Hex Size (in): 5/8 Inch Preset Gap (in): 0.044 Inch Preset Gap (mm): 1.12mm Thread Reach (in): 0.750 Inch Center Electrode Core Material: Copper Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 4000 Ohm Insulator Height (mm): 51mm Insulator Height (in): 2.007 Inch Ground Electrode Tip Material: Nickel Thread Reach (mm): 19.05mm Metallurgy: Iridium Show More Show Less
Compare Autolite Xtreme Start Spark Plug - XST4265DP Part #: XST4265DP Line: ATO Autolite Xtreme Start Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14-1.25 Heat Range: 8 Hex Size (mm): 21mm Hex Size (in): 13/16 Inch Preset Gap (in): 0.034 Inch Preset Gap (mm): 0.86mm Thread Reach (in): 0.750 Inch Center Electrode Core Material: Nickel Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 5000 Ohm Insulator Height (mm): 53.9mm Insulator Height (in): 2.124 Inch Ground Electrode Tip Material: Nickel Thread Reach (mm): 19.05mm Metallurgy: Iridium Show More Show Less
Compare Autolite Xtreme Start Spark Plug - XST458DP Part #: XST458DP Line: ATO Autolite Xtreme Start Spark Plug 2 Year LIMITED WARRANTY Seat: Gasket Thread Size: M14-1.25 Heat Range: 2 Hex Size (mm): 21mm Hex Size (in): 13/16 Inch Preset Gap (in): 0.030 Inch Preset Gap (mm): 0.76mm Thread Reach (in): 0.374 Inch Center Electrode Core Material: Nickel Center Electrode Tip Material: Iridium Approximate Resistor Value (Ohm): 1000 Ohm Insulator Height (mm): 47mm Insulator Height (in): 1.849 Inch Ground Electrode Tip Material: Nickel Thread Reach (mm): 9mm Metallurgy: Iridium Show More Show Less