Sihai Cheng, also known as Alex Cheng, was brought to the United States yesterday after being arrested in Britain earlier this year. He is expected to make an initial appearance in US District Court in Boston on Monday.
In a 2013 indictment, Cheng is accused of conspiracy, illegal exporting of US goods to Iran and smuggling.
Cheng allegedly established shell companies in China to receive pressure-measuring sensors known as "pressure transducers" from the Shanghai subsidiary of Massachusetts-based MKS Instruments Inc, according to the indictment.
Cheng is accused of conspiring with Seyed Abolfazl Shahab Jamili, of Tehran, to send hundreds of sensors made by MKS to Eyvaz Technic Manufacturing Co, a Tehran company that has supplied parts for Iran's development of nuclear weapons, the indictment states.
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The US Attorney's Office has previously said that MKS sent the instruments to China without knowing they were to go to Iran and is not a target of the investigation, which began in 2012.
The sensors cannot be exported to Iran because of the US embargo.
Jamili described the types of projects for which he was procuring parts for the Iran government in emails with Cheng, according to the indictment. In a March 2007 email, "Jamili confided to Cheng that the parts he was supplying are needed in Iran for 'a very big project and secret one,'" the indictment states.
The indictment says publicly available photographs of the Natanz uranium enrichment facility in Iran show numerous MKS pressure transducers attached to Iran's gas centrifuge cascades.
Court documents filed in Boston did not list an attorney.