Takata Corp. said on Wednesday it plans to boost production of parts needed to replace potentially deadly air bag inflators that could spray vehicle occupants with metal shards.

On Tuesday, the Japanese supplier doubled its recall of the defective air bags to nearly 34 million vehicles, making it the largest automotive recall in U.S. history. Takata shares fell 10.2 percent to ¥1,353 in Tokyo on Wednesday.

The air bag inflators have been found to explode with too much force, spraying metal fragment inside cars and forcing automakers to recall more than 53 million vehicles worldwide since 2008. The component has been linked to six deaths, all in cars made by the supplier's top customer, Honda Motor Co.