<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
FOR THE QUARTERLY PERIODS ENDED MARCH 31, 1997, JUNE 30, 1997 AND SEPTEMBER 30,
1997
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             APR-01-1997             JUL-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                           7,895                  13,913                  23,786
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   13,170                  18,321                  15,530
<ALLOWANCES>                                       400                     400                     400
<INVENTORY>                                     29,900                  26,703                  21,713
<CURRENT-ASSETS>                                55,826                  61,611                  64,203
<PP&E>                                          34,779                  35,362                  35,582
<DEPRECIATION>                                  14,828                  15,531                  16,109
<TOTAL-ASSETS>                                  77,766                  83,458                  87,742
<CURRENT-LIABILITIES>                            9,067                  11,550                  11,701
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                        38,478                  38,545                  38,613
<OTHER-SE>                                      29,480                  32,296                  36,036
<TOTAL-LIABILITY-AND-EQUITY>                    77,766                  83,458                  87,742
<SALES>                                         29,001                  68,939                 112,874
<TOTAL-REVENUES>                                29,001                  68,939                 112,874
<CGS>                                           24,976                  56,932                  91,498
<TOTAL-COSTS>                                   24,976                  56,932                  91,498
<OTHER-EXPENSES>                                 2,184                   5,462                   8,587
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0
<INCOME-PRETAX>                                  2,013                   6,920                  13,369
<INCOME-TAX>                                       815                   2,906                   5,615
<INCOME-CONTINUING>                              1,198                   4,014                   7,754
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     1,198                   4,014                   7,754
<EPS-PRIMARY>                                      .14                     .46                     .88
<EPS-DILUTED>                                      .13                     .45                     .87
        

</TABLE>