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O型圈丁腈胶NBR70内径268/272/278.99/279/291.69/291.96线径3.53
【甬成】丁腈O型圈NBR内径278.99/279/291.69/291.96*3.53 耐油
O型圈 丁晴/线径3.53MM内径268/272/278.99/279/291.69/291.96
O型圈丁晴内径268/272/278.99/279/291.69/291.96/304.17线径3.53