EXHIBIT 32.1

                             CERTIFICATE PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned, Mason N. Carter, Chief Executive Officer of Merrimac
Industries, Inc. (the "Company"), hereby certifies, pursuant to 18 U.S.C. 1350,
as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

     1.   The Company's Quarterly Report on Form 10-Q for the period ending
          September 30, 2006, as filed with the Securities and Exchange
          Commission on the date hereof (the "Quarterly Report"), fully complies
          with the requirements of Section 13(a) or 15(d) of the Securities
          Exchange Act of 1934; and

     2.   The information contained in the Quarterly Report fairly presents, in
          all material respects, the financial condition and results of
          operations of the Company.


/s/ Mason N. Carter
-------------------------------------
Mason N. Carter
Chief Executive Officer
November 14, 2006


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