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                                                                     EXHIBIT 5.1

                              September 8, 1998




Hadco Corporation
12A Manor Parkway
Salem, NH 03079


Ladies and Gentlemen:

     We are acting as counsel to Hadco Corporation, a Massachusetts corporation
(the "Company") in connection with the registration on a Registration Statement
on Form S-4 (the "Registration Statement") and the prospectus forming a part
thereof )the "Prospectus") under the Securities Act of 1933, as  amended, of
$200,000,000 aggregate principal amount of the Company's 9 1/2% Senior
Subordinated Notes due 2008 (the "Exchange Notes") and the related guarantees
(the "Guarantees") of certain of the Company's subsidiaries named in  the
Registration Statement (the "Guarantors"). The Exchange Notes and the Guarantees
are proposed to be issued under an indenture dated as of May 18, 1998 (the
"Indenture") among the Company, as trustee, and the related Registration Rights
Agrement (the "Registration Rights Agreement"), dated May  13, 1998, among the
Company, the guarantors and the Initial Purchasers (as defined in the
Registration Rights Agreement) in exchange for the Company's 9 1/2% Senior
Subordinated Notes due 2008 (the"original Notes") and related guarantees.


     We have examined such documents, records and matters of law as we have
deemed necessary for purposes of this opinion. We have assumed that the
Exchange Notes and the Guarantees will be executed and delivered as set forth in
the Registration Statement, the Prospectus and the Letter of Transmittal set
forth as an exhibit to the Registration Statement. We have assumed the
genuineness of all signatures and the conformity to original documents of all
copies of documents submitted to us as copies, whether certified or not. We
have assumed the specimens of the certificates, which are included as an exhibit
to the Registration Statement. We have assumed that the Exhange Notes, the
Guarantees and the Indenture have been duly authorized, executed and
authenticated in accordance with the terms of the Indenture by each of the
parties thereto. Our opinions expressed herein with respect to the validly and
binding effect the Exchange Notes and the Guarantees are qualified to the Extent
that the validity and binding effect thereof may be limited by (i) applicable
bankruptcy, reorganization, arrangements, insolvency, fraud on creditors'
rights generally as at the time in effect and (ii) general principles of equity
(whether considered in a proceeding of law or in equity).
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Hadco Corporation
September 8, 1998
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     We are members only of the bar of the Commonwealth of Massachusetts and
therefore do not hold ourselves out as experts in, and express no opinion as to,
the laws of any other state of jurisdiction other than the Laws of the
Commonwealth of Massachusetts and the federal laws of the United States of
America.

     Based upon and subject to the foregoing, we are of the opinion that the
Exchange Notes and the Guarantees, when duly executed and authenticated in
accordance with the terms of the Indenture and delivered in exchange for the
Original Notes as contemplated in the Prospectus, will be valid and binding
obligations of the Company and the Guarantors, respectively.

     We consent to the filing of this opinion as an exhibit to the Registration
Statement and to the reference to us under the caption "Legal Matters" in the
Registration Statement.



                                   Very truly yours,

                                   /s/ Testa, Hurwitz & Thibeault, LLP
                                   ------------------------------------------

                                   TESTA, HURWITZ & THIBEAULT, LLP