<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-END>                               DEC-31-1997             MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                         159,044                   4,771                 208,526                 226,320
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                               23,188,066              20,775,228              22,366,889              18,831,421
<ALLOWANCES>                                   430,000                 430,000                 430,000                 430,000
<INVENTORY>                                 28,404,786              24,994,264              22,289,972              23,951,731
<CURRENT-ASSETS>                            53,528,995              46,762,334              45,923,798              44,080,243
<PP&E>                                      46,083,344              41,593,701              42,431,671              43,574,615
<DEPRECIATION>                              16,522,903              14,836,541              15,399,305              15,881,755
<TOTAL-ASSETS>                              85,874,312              76,426,871              75,810,808              74,575,014
<CURRENT-LIABILITIES>                       23,165,040              18,301,853              17,687,004              18,455,920
<BONDS>                                     17,359,703              19,696,682              16,344,766              12,639,401
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                     1,040,276                 942,454                 990,135               1,039,642
<OTHER-SE>                                           0                       0                       0                       0
<TOTAL-LIABILITY-AND-EQUITY>                85,874,312              76,426,871              75,810,808              74,575,014
<SALES>                                    197,968,159              44,173,303             100,449,206             146,140,460
<TOTAL-REVENUES>                           197,968,159              44,173,303             100,449,206             146,140,460
<CGS>                                      165,197,662              37,036,681              82,916,179             121,564,238
<TOTAL-COSTS>                              165,197,662              37,036,681              82,916,179             121,564,238
<OTHER-EXPENSES>                            17,228,565               3,949,378               8,419,166              12,328,511
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                           1,409,713                 349,845                 763,225               1,062,419
<INCOME-PRETAX>                             14,132,219               2,837,399               8,350,636              11,185,292
<INCOME-TAX>                                 5,577,000               1,152,000               3,334,000               4,468,000
<INCOME-CONTINUING>                          8,555,219               1,685,399               5,016,636               6,717,292
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                 8,555,219               1,685,399               5,016,636               6,717,292
<EPS-PRIMARY>                                     0.75                    0.16                    0.44                    0.59
<EPS-DILUTED>                                     0.74                    0.16                    0.44                    0.58
        

</TABLE>