丁晴O型圈内径*线径539.3/544.3/545/549.3*5.7密封垫圈
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【甬成】丁晴O型圈NBR内径527.8/532.8/542.8/544.3/552.8*8.6mm
【甬成】丁腈 NBR内径544.3/545/549.3/554.3*5.7mm耐油O型密封圈
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