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NATIONAL OIL SEALS是1920年由LIoyd A.Johnson創(chuàng)立的，專門從事油封、墊圈墊片的生產(chǎn)，在當(dāng)時就已經(jīng)是美國的油封生產(chǎn)廠家之一，為汽車和飛機的主要配套油封工廠。于1956年被Federal-Mogul攬于旗下。F-M公司是一家綜合性的汽車零配件廠家，從1899年成立至今，通過不斷的發(fā)展和并購，擁有了一系列的汽車零部件品牌，產(chǎn)品包括軸瓦、引擎、雨刷、火花塞、軸承、油封、活塞環(huán)、制動系統(tǒng)、墊圈和底盤系統(tǒng)等等，成為了的汽車零部件供應(yīng)商。

    NATIONAL油封制造基地從剛創(chuàng)立時的San Francisco， 至1942年搬到Redwood City，再后搬至Summerton和Mexico City，現(xiàn)已把制造重心放在了MEXICO CITY。這就是為什么油封上會標(biāo)注為USA和MX的緣故。除此兩處之外，NATIONAL油封再也沒有其它的制造基地了。

    而NATIONAL油封與其它品牌的不同之處，就是在鐵殼外圈的外徑上噴涂了紅色的REDICOAT專用涂漆，一方面可以區(qū)別其它品牌的顏色，另一方面，也是主要的方面，鐵殼外徑噴涂紅漆可增加外徑的密封性能，可填充裝配孔腔表面之缺陷或刮痕，避免密封流體由外徑泄漏。這種REDICOAT涂漆，對孔腔面的加工光潔度就有所放松，允許有較大的表面粗糙度，同樣起到內(nèi)骨架油封(外徑包有橡膠)的密封效果。

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