Exhibit 31.2



AMTECH SYSTEMS, INC. AND ITS SUBSIDIARIES

CERTIFICATION PURSUANT TO RULE 13a-14(a)/15d-14(a)

OF THE SECURITIES EXCHANGE ACT OF 1934, As Amended



I, Robert T. Hass, certify that:



1. I have reviewed this Annual Report on Form 10-K of Amtech Systems,
Inc.;



2. Based on my knowledge, this annual report does not
contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this
annual report;



3. Based on my knowledge, the financial
statements, and other financial information included in this annual report, fairly present in all material respects the financial position, results of operations and cash flows of the registrant as of, and for, the periods presented in this annual
report;



4. The registrants other certifying officer and
I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the registrant and we have:



(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to
be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this annual
report is being prepared;



(b) evaluated the
effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on
such evaluation; and



(c) disclosed in this
report any change in the registrants internal control over financial reporting that occurred during the registrants most recent fiscal quarter (the registrants fourth fiscal quarter in the case of an annual report) that has
materially affected, or is reasonably likely to materially affect, the registrants internal control over financial reporting.



5. The registrants other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting,
to the registrants auditors and the audit committee of registrants board of directors (or persons performing the equivalent functions):



(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are
reasonably likely to adversely affect the registrants ability to record, process, summarize and report financial information; and



(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants
internal control over financial reporting.



|      |  |                                                   
|----- |  | --------------------------------------------------
|By    |  | /s/ Robert T. Hass                                
|      |  | Robert T. Hass                                    
|      |  | Vice President Finance and Chief Financial
Officer
|      |  | Amtech Systems, Inc.                              
|      | 
|Date: |  | October 18, 2005