Ceradyne, Inc., Costa Mesa, Calif., a manufacturer of advanced technical ceramics for defense, industrial, consumer, automotive and microwave tube applications, received a multi-year commitment from its largest diesel engine components customer to purchase sintered reaction bonded silicon nitride (SRBSN) ceramic components for additional areas of its diesel engines. Ceradyne has received an initial order under this commitment for approximately $1.4 million, and expects to complete delivery of these components in the third quarter of 2003. If this program is successful, total orders under this commitment could be $26 million or more during the course of four years through 2006.