<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the Balance
Sheet and Income Statement and is qualified in its entirety by reference to such
financial statements.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>                      
<PERIOD-TYPE>                   3-MOS                   3-MOS                   3-MOS                   
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997  
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997  
<CASH>                                          10,792                  19,139                  22,090
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   58,311                  63,988                  62,562
<ALLOWANCES>                                     1,442                   1,548                   1,566
<INVENTORY>                                     65,208                  63,503                  66,846
<CURRENT-ASSETS>                               142,485                 154,325                 159,086
<PP&E>                                         137,142                 141,949                 147,662
<DEPRECIATION>                                  47,331                  47,296                  49,103
<TOTAL-ASSETS>                                 256,695                 272,935                 281,321
<CURRENT-LIABILITIES>                           55,065                  59,735                  61,871
<BONDS>                                              0                   4,612                   4,590
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                           230                     232                     233
<OTHER-SE>                                     185,973                 196,867                 202,313
<TOTAL-LIABILITY-AND-EQUITY>                   256,695                 272,935                 281,321
<SALES>                                         80,168                 164,724                 247,967
<TOTAL-REVENUES>                                80,512                 165,531                 249,204
<CGS>                                           36,116                  75,185                 113,311
<TOTAL-COSTS>                                   36,116                  75,185                 113,311
<OTHER-EXPENSES>                                     0                       0                       0
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                   9                      32                      48
<INCOME-PRETAX>                                 12,541                  25,823                  38,362
<INCOME-TAX>                                     4,515                   8,296                  13,810
<INCOME-CONTINUING>                              7,838                  16,176                  24,049
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     7,838                  16,176                  24,049
<EPS-PRIMARY>                                     0.34                    0.70                    1.04
<EPS-DILUTED>                                     0.33                    0.68                    1.01 
        


</TABLE>