![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_00.png\")
<\/figure>\n<\/div>\n\n\n ![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_01.png\")
Insulator<\/h6>\n\n\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_01.png\")
<\/figure>\n<\/div>\n\n\n\n\nInsulates the terminal, center shaft and center electrode from the housing, preventing escape of high voltage from the electrodes.
Since the bottom of the insulator projects into the combustion chamber, high purity alumina with superior heat-proof characteristic, mechanical strength, excellent insulation and thermal conductivity at high temperature, etc. is used.<\/p>\n<\/div>\n<\/div>\n\n\n\n
![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_02.png\")
Terminal<\/h6>\n\n\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_02.png\")
<\/figure>\n<\/div>\n\n\n\n\nThe terminal is connected to a high-tension cord through which high-voltage current from the ignition system flows.
A terminal nut is installed so this type can support almost any high-tension cord in the world. For vehicles not requiring a terminal nut, the terminal can be removed.<\/p>\n<\/div>\n<\/div>\n\n\n\n
![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_03.png\")
Ring, packing washer<\/h6>\n\n\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_03.png\")
<\/figure>\n<\/div>\n\n\n\n\nMakes the insulator and the housing fit tightly to each other and maintains the airtightness.<\/p>\n<\/div>\n<\/div>\n\n\n\n
![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_04.png\")
Center shaft (stem)<\/h6>\n\n\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_04.png\")
<\/figure>\n<\/div>\n\n\n\n\nCenter shaft connecting the terminal and the center electrode.
This shaft is made of steel and has the role of allowing high-voltage current to flow from the terminal to the center electrode without loss.<\/p>\n<\/div>\n<\/div>\n\n\n\n
![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_05.png\")
Housing<\/h6>\n\n\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_05.png\")
<\/figure>\n<\/div>\n\n\n\n\nThe housing forms an outer shell that surrounds the insulator, supports the insulator, and installs the spark plug in the engine.
At the bottom the ground electrode is located, so current can flow through the engine itself to the center electrode over the gap.<\/p>\n<\/div>\n<\/div>\n\n\n\n
![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_06.png\")
Glass Seal<\/h6>\n\n\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_06.png\")
<\/figure>\n<\/div>\n\n\n\n\nMounted between the center shaft and insulator to maintain the airtightness.
DENSO uses the glass seal method.
A special mixture of glass powder and copper powder is charged in the installation section for the insulator and center shaft and center electrode and melted at high temperature. This bonds the center shaft and the center electrode and fuses the insulator and the metal.
The sealing for both is good and the thermal ratio of expansion is appropriate, so even under harsh conditions gaps do not occur and good airtightness can be secured.<\/p>\n<\/div>\n<\/div>\n\n\n\n
![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_07.png\")
Gasket<\/h6>\n\n\n\n
<\/figure>\n<\/div>\n\n\n\nInsulates the terminal, center shaft and center electrode from the housing, preventing escape of high voltage from the electrodes.
Since the bottom of the insulator projects into the combustion chamber, high purity alumina with superior heat-proof characteristic, mechanical strength, excellent insulation and thermal conductivity at high temperature, etc. is used.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Terminal<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nThe terminal is connected to a high-tension cord through which high-voltage current from the ignition system flows.
A terminal nut is installed so this type can support almost any high-tension cord in the world. For vehicles not requiring a terminal nut, the terminal can be removed.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Ring, packing washer<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nMakes the insulator and the housing fit tightly to each other and maintains the airtightness.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Center shaft (stem)<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nCenter shaft connecting the terminal and the center electrode.
This shaft is made of steel and has the role of allowing high-voltage current to flow from the terminal to the center electrode without loss.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Housing<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nThe housing forms an outer shell that surrounds the insulator, supports the insulator, and installs the spark plug in the engine.
At the bottom the ground electrode is located, so current can flow through the engine itself to the center electrode over the gap.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Glass Seal<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nMounted between the center shaft and insulator to maintain the airtightness.
DENSO uses the glass seal method.
A special mixture of glass powder and copper powder is charged in the installation section for the insulator and center shaft and center electrode and melted at high temperature. This bonds the center shaft and the center electrode and fuses the insulator and the metal.
The sealing for both is good and the thermal ratio of expansion is appropriate, so even under harsh conditions gaps do not occur and good airtightness can be secured.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Gasket<\/h6>\n\n\n\n
<\/figure>\n<\/div>\n\n\n\nThe terminal is connected to a high-tension cord through which high-voltage current from the ignition system flows.
A terminal nut is installed so this type can support almost any high-tension cord in the world. For vehicles not requiring a terminal nut, the terminal can be removed.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Ring, packing washer<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nMakes the insulator and the housing fit tightly to each other and maintains the airtightness.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Center shaft (stem)<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nCenter shaft connecting the terminal and the center electrode.
This shaft is made of steel and has the role of allowing high-voltage current to flow from the terminal to the center electrode without loss.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Housing<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nThe housing forms an outer shell that surrounds the insulator, supports the insulator, and installs the spark plug in the engine.
At the bottom the ground electrode is located, so current can flow through the engine itself to the center electrode over the gap.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Glass Seal<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nMounted between the center shaft and insulator to maintain the airtightness.
DENSO uses the glass seal method.
A special mixture of glass powder and copper powder is charged in the installation section for the insulator and center shaft and center electrode and melted at high temperature. This bonds the center shaft and the center electrode and fuses the insulator and the metal.
The sealing for both is good and the thermal ratio of expansion is appropriate, so even under harsh conditions gaps do not occur and good airtightness can be secured.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Gasket<\/h6>\n\n\n\n
<\/figure>\n<\/div>\n\n\n\nMakes the insulator and the housing fit tightly to each other and maintains the airtightness.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Center shaft (stem)<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nCenter shaft connecting the terminal and the center electrode.
This shaft is made of steel and has the role of allowing high-voltage current to flow from the terminal to the center electrode without loss.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Housing<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nThe housing forms an outer shell that surrounds the insulator, supports the insulator, and installs the spark plug in the engine.
At the bottom the ground electrode is located, so current can flow through the engine itself to the center electrode over the gap.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Glass Seal<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nMounted between the center shaft and insulator to maintain the airtightness.
DENSO uses the glass seal method.
A special mixture of glass powder and copper powder is charged in the installation section for the insulator and center shaft and center electrode and melted at high temperature. This bonds the center shaft and the center electrode and fuses the insulator and the metal.
The sealing for both is good and the thermal ratio of expansion is appropriate, so even under harsh conditions gaps do not occur and good airtightness can be secured.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Gasket<\/h6>\n\n\n\n
<\/figure>\n<\/div>\n\n\n\nCenter shaft connecting the terminal and the center electrode.
This shaft is made of steel and has the role of allowing high-voltage current to flow from the terminal to the center electrode without loss.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Housing<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nThe housing forms an outer shell that surrounds the insulator, supports the insulator, and installs the spark plug in the engine.
At the bottom the ground electrode is located, so current can flow through the engine itself to the center electrode over the gap.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Glass Seal<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nMounted between the center shaft and insulator to maintain the airtightness.
DENSO uses the glass seal method.
A special mixture of glass powder and copper powder is charged in the installation section for the insulator and center shaft and center electrode and melted at high temperature. This bonds the center shaft and the center electrode and fuses the insulator and the metal.
The sealing for both is good and the thermal ratio of expansion is appropriate, so even under harsh conditions gaps do not occur and good airtightness can be secured.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Gasket<\/h6>\n\n\n\n
<\/figure>\n<\/div>\n\n\n\nThe housing forms an outer shell that surrounds the insulator, supports the insulator, and installs the spark plug in the engine.
At the bottom the ground electrode is located, so current can flow through the engine itself to the center electrode over the gap.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Glass Seal<\/h6>\n\n\n\n\n\n<\/figure>\n<\/div>\n\n\n\n\nMounted between the center shaft and insulator to maintain the airtightness.
DENSO uses the glass seal method.
A special mixture of glass powder and copper powder is charged in the installation section for the insulator and center shaft and center electrode and melted at high temperature. This bonds the center shaft and the center electrode and fuses the insulator and the metal.
The sealing for both is good and the thermal ratio of expansion is appropriate, so even under harsh conditions gaps do not occur and good airtightness can be secured.<\/p>\n<\/div>\n<\/div>\n\n\n\n
Gasket<\/h6>\n\n\n\n
<\/figure>\n<\/div>\n\n\n\nMounted between the center shaft and insulator to maintain the airtightness.
DENSO uses the glass seal method.
A special mixture of glass powder and copper powder is charged in the installation section for the insulator and center shaft and center electrode and melted at high temperature. This bonds the center shaft and the center electrode and fuses the insulator and the metal.
The sealing for both is good and the thermal ratio of expansion is appropriate, so even under harsh conditions gaps do not occur and good airtightness can be secured.<\/p>\n<\/div>\n<\/div>\n\n\n\n
![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_07.png\")
<\/figure>\n<\/div>\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_08.png\"){kind=icon}
Electrode with copper<\/h6>\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_08.png\")
<\/figure>\n<\/div>\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_09.png\"){kind=icon}
Ring, packing washer<\/h6>\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_09.png\")
<\/figure>\n<\/div>\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_10.png\"){kind=icon}
Center Electrode<\/h6>\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_10.png\")
<\/figure>\n<\/div>\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_11.png\"){kind=icon}
U-groove ground electrode<\/h6>\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_11.png\")
<\/figure>\n<\/div>\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_icon_12.png\"){kind=icon}
Tapered cut ground electrode<\/h6>\n\n\n\n![\"\"](\"https:\/\/am.denso.com\/plug-global\/wp-content\/uploads\/sites\/23\/structure_img_12.png\")
<\/figure>\n<\/div>\n\n\n\n