Press release #Automotive Aftermarket

New and particularly robust generation of Bosch industrial spark plugs with increased service life

Double Iridium spark plugs for stationary engines

  • Reduced costs thanks to increased service life, less engine breakdowns and increased service intervals
  • Significantly increased head bending strength, dielectric strength and warm gas tightness
  • Service life increased by 30 percent compared to previous generations of industrial spark plugs
Nico Krespach

Nico Krespach >


Due to their increased efficiency, turbocharging and leaner fuel mixtures, modern stationary engines – such as the ones used in combined heat and power plants – place much higher demands on the spark plugs used, too. Especially their thermal and mechanical characteristics have to meet increased requirements to ensure flawless operation of industrial engines around the clock. The new generation of Bosch Double Iridium industrial spark plugs, now available with the types 7305 and 7308, meets these requirements and stands out for an increase in service life by 30 percent in comparison with the previous generation of spark plugs. The spark plugs thus also help reducing the operating costs.

Thanks to high-grade materials, modern production methods and an improved design, the new generation of Bosch industrial spark plugs is particularly robust. The enlarged profile of the ground electrode, for instance, increases both mechanical strength and thermal conductivity. The industrial ceramic material used is of particularly high quality. It increases the dielectric strength. But the new spark-plug generation also sets new standards in terms of head bending strength. In addition, an improved coating technique and a Bosch-patented laser welding method for the Iridium electrodes increase the electrode service life. Besides the service life, the warm gas tightness was significantly improved as well. This is particularly important for turbocharged lean burn engines.

Test customers confirm robustness and cost reduction

Furthermore, a new nickel plating technique used for the new generation of Bosch industrial spark plugs also prevents spark plug seizure at the engine thus easing the maintenance, particularly if it is run with landfill gas or biogas. Due to the increased head bending strength and the high dielectric strength, reliable operation of the engine is ensured at any time – even under extreme operating conditions. Customers who tested the new generation of Bosch industrial spark plugs at their stationary engines did not only confirm the high durability of the new spark plugs, but also commented on prolonged service intervals, reduced engine downtime and lower costs.

Contact person for press inquiries:
Nico Krespach
Phone: +49 721 942-2209

The Automotive Aftermarket division (AA) provides the aftermarket and repair shops worldwide with modern diagnostic and repair shop equipment and a wide range of spare parts – from new and exchange parts to repair solutions – for passenger cars and commercial vehicles. Its product portfolio includes products made as Bosch original equipment, products developed in-house and specifically manufactured for the aftermarket, as well as services. About 13,000 associates in more than 150 countries, as well as a global logistics network, ensure that spare parts reach customers quickly and on time. AA supplies testing and repair-shop technology, diagnostic software, service training, and information services. In addition, the division is responsible for the “Bosch Service” repair-shop franchise, one of the world’s largest independent chains of repair-shops, with some 15,000 workshops, and more than 1,000 “AutoCrew” partners.

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The Bosch Group is a leading global supplier of technology and services. It employs roughly 402,600 associates worldwide (as of December 31, 2021). The company generated sales of 78.7 billion euros in 2021. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. As a leading IoT provider, Bosch offers innovative solutions for smart homes, Industry 4.0, and connected mobility. Bosch is pursuing a vision of mobility that is sustainable, safe, and exciting. It uses its expertise in sensor technology, software, and services, as well as its own IoT cloud, to offer its customers connected, cross-domain solutions from a single source. The Bosch Group’s strategic objective is to facilitate connected living with products and solutions that either contain artificial intelligence (AI) or have been developed or manufactured with its help. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.” The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiary and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing, engineering, and sales network covers nearly every country in the world. With its more than 400 locations worldwide, the Bosch Group has been carbon neutral since the first quarter of 2020. The basis for the company’s future growth is its innovative strength. At 128 locations across the globe, Bosch employs some 76,100 associates in research and development, of which more than 38,000 are software engineers.

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