Aerospace parts maker Ducommun Inc. said Monday that it will offer $200 million in senior notes to help pay for its pending acquisition of LaBarge Inc.

The unsecured notes, due in 2018, will be sold after closing of the $340 million LaBarge deal, which Ducommun expects to happen Thursday after a LaBarge stockholders' meeting.

The notes will be sold to institutional buyers.

LaBarge, based in LaDue, Mo., makes electronic circuit boards, cables and other components.

LaBarge and Ducommun, based in Carson, Calif., announced the deal in April.

LaBarge's largest customers include Boeing, Raytheon and General Electric. Last year, it had revenue of $324 million.