<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMO OPTEK
CORPORATION'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED JUNE 28, 1996
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-28-1996
<PERIOD-END>                               JUN-28-1996
<CASH>                                         106,986
<SECURITIES>                                         0
<RECEIVABLES>                                   89,322
<ALLOWANCES>                                     7,449
<INVENTORY>                                     74,304
<CURRENT-ASSETS>                               285,126
<PP&E>                                          79,868
<DEPRECIATION>                                  19,569
<TOTAL-ASSETS>                                 589,677
<CURRENT-LIABILITIES>                          248,123
<BONDS>                                        100,854
<PREFERRED-MANDATORY>                              480
<PREFERRED>                                          0
<COMMON>                                             0
<OTHER-SE>                                     223,327
<TOTAL-LIABILITY-AND-EQUITY>                   589,677
<SALES>                                        177,556
<TOTAL-REVENUES>                               177,556
<CGS>                                           97,813
<TOTAL-COSTS>                                   97,813
<OTHER-EXPENSES>                                11,713
<LOSS-PROVISION>                                   781
<INTEREST-EXPENSE>                               3,309
<INCOME-PRETAX>                                 17,745
<INCOME-TAX>                                     7,392
<INCOME-CONTINUING>                             10,353
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    10,353
<EPS-PRIMARY>                                      .23
<EPS-DILUTED>                                      .23