SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 12b-25
                                                  Commission File Number 0-11201

                           NOTIFICATION OF LATE FILING


(Check one):   (X) Form 10-KSB          ( ) Form 11-K      ( ) Form 20-F
               ( ) Form 10-QSB          ( ) Form N-SAR

               For period ended:         December 28, 2003

         ( )  Transition Report on Form 10-K
         ( )  Transition Report on Form 20-F
         ( )  Transition Report on Form 11-K
         ( )  Transition Report on Form 10-Q
         ( )  Transition Report on Form N-SAR

                  For the transition period ended:

     Nothing in this form shall be construed to imply that the Commission has
verified any information contained herein.

     If the notification relates to a portion of the filing checked above,
identify the item(s) to which the notification relates:

                                     PART I

                             REGISTRANT INFORMATION

Full name of registrant:

     MERRIMAC INDUSTRIES, INC.

Former name if applicable:

Address of principal executive office (Street and Number):

     41 FAIRFIELD PLACE

City, State and Zip Code:

     WEST CALDWELL, NEW JERSEY 07006



                                     PART II

                             RULES 12B-25(b) AND (c)

     If the subject report could not be filed without unreasonable effort or
expense and the registrant seeks relief pursuant to Rule 12b-25(b), the
following should be completed. (Check where appropriate.)

(X)  (a) The reasons described in reasonable detail in Part III of this form
     could not be eliminated without unreasonable effort or expense;

(X)  (b) The subject annual report, semi-annual report, transition report on
     Form 10-K, 20-F, 11-K or Form N-SAR, or portion thereof will be filed on or
     before the 15th calendar day following the prescribed due date; or the
     subject quarterly report or transition report on Form 10-Q, or portion,
     thereof will be filed on or before the fifth calendar day following the
     prescribed due date, and

( )  (c) The accountant's statement or other exhibit required by Rule 12b-25(c)
     has been attached if applicable.


                                    PART III

                                    NARRATIVE

State below in reasonable detail the reasons why Form 10-K, 11-K, 20-F, 10-QSB,
N-SAR or the transition report portion thereof could not be filed within the
prescribed time period. (Attach extra sheets if needed.)

     Negotiation of changes to the Company's credit facility with its primary
     lender could not be concluded on a timely basis and the appropriate 10-KSB
     disclosure of the Company's relationship with the lender could not be
     prepared and approved by management until a final, binding agreement is in
     place.


                                     PART IV

                                OTHER INFORMATION

(1)  Name and telephone number of person to contact in regard to this
     notification.

(2)
     Mason N. Carter                    (973)  575-1300
     ----------------------------------------------------
         (Name)                      (Telephone Number)

(3)  Have all other periodic reports required under Section 13 or 15(d) or the
     Securities Exchange Act of 1934 or Section 30 of the Investment Company Act
     of 1940 during the preceding 12 months or for such



     shorter period that the registrant was required to file such report(s) been
     filed? If the answer is no, identify report(s).

                          (X) Yes          ( ) No

(4)  Is it anticipated that any significant change in results of operations from
     the corresponding period for the last fiscal year will be reflected by the
     earnings statements to be included in the subject report or portion
     thereof?

                          ( ) Yes          (X) No

If so, attach an explanation of the anticipated change, both narratively and
quantitatively, and, if appropriate, state the reasons why a reasonable estimate
of the results cannot be made.

                            MERRIMAC INDUSTRIES, INC.
                            -------------------------
                  (Name of Registrant as Specified in Charter)

Has caused this notification to be signed on its behalf by the undersigned
thereunto duly authorized.



Date:  March 28, 2003               By: /s/ Mason N. Carter
                                        --------------------------
                                        Mason N. Carter
                                        Chairman and Chief Executive Officer