EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the use in this Amendment No. 1 to Registration Statement No. 333-131613 of our report dated February 27, 2006, relating to the consolidated financial statements of Ultra Clean Holdings, Inc. and subsidiaries appearing in the Prospectus, which is a part of such Registration Statement, and to the reference to us under the heading “Experts” in such Prospectus.

/s/ DELOITTE & TOUCHE LLP

San Jose, CA
February 27, 2006