The Claas 0021525890 is a genuine OEM glow plug designed for efficient and reliable cold starting in various Claas agricultural machinery. This 11V glow plug features an 85mm overall length and an M10x1.25 thread, with a 10mm wrench size and M4 connection type. It is a critical component for diesel engine preheating, ensuring optimal performance across a wide range of Claas tractors, combines, forage harvesters, and balers, including specific models from the ARION, AXION, LEXION, JAGUAR, and QUADRANT series. This part is cross-referenced with equivalent numbers from Deutz, John Deere, Massey Ferguson, Perkins, Renault, and Valtra.