NATIONAL OIL SEALS是1920年由LIoyd A.Johnson创立的，专门从事油封、垫圈垫片的生产，在当时就已经是美国的油封生产厂家之一，为汽车和飞机的主要配套油封工厂。于1956年被Federal-Mogul揽于旗下。F-M公司是一家综合性的汽车零配件厂家，从1899年成立至今，通过不断的发展和并购，拥有了一系列的汽车零部件品牌，产品包括轴瓦、引擎、雨刷、火花塞、轴承、油封、活塞环、制动系统、垫圈和底盘系统等等，成为了的汽车零部件供应商。

    NATIONAL油封制造基地从刚创立时的San Francisco， 至1942年搬到Redwood City，再后搬至Summerton和Mexico City，现已把制造重心放在了MEXICO CITY。这就是为什么油封上会标注为USA和MX的缘故。除此两处之外，NATIONAL油封再也没有其它的制造基地了。

    而NATIONAL油封与其它品牌的不同之处，就是在铁壳外圈的外径上喷涂了红色的REDICOAT专用涂漆，一方面可以区别其它品牌的颜色，另一方面，也是主要的方面，铁壳外径喷涂红漆可增加外径的密封性能，可填充装配孔腔表面之缺陷或刮痕，避免密封流体由外径泄漏。这种REDICOAT涂漆，对孔腔面的加工光洁度就有所放松，允许有较大的表面粗糙度，同样起到内骨架油封(外径包有橡胶)的密封效果。

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NATIONAL OIL SEAL, 418029 NATIONAL OIL SEAL, 42081S NATIONAL OIL SEAL, 42135S NATIONAL OIL SEAL, 42260S NATIONAL OIL SEAL, 42280S NATIONAL OIL SEAL, 42364S NATIONAL OIL SEAL, 4244 NATIONAL OIL SEAL, 4249 NATIONAL OIL SEAL, 4250 NATIONAL OIL SEAL, 42754S NATIONAL OIL SEAL, 42763 NATIONAL OIL SEAL, 42X55X7 NATIONAL OIL SEAL, 42X55X8 NATIONAL OIL SEAL, 42X56X7 NATIONAL OIL SEAL, 42X58X7 NATIONAL OIL SEAL, 42X60X9 NATIONAL OIL SEAL, 42X62X8 NATIONAL OIL SEAL, 42X65X10 NATIONAL OIL SEAL, 42X68X8 NATIONAL OIL SEAL, 42X80X10 NATIONAL OIL SEAL, 43000S NATIONAL OIL SEAL, 43073S NATIONAL OIL SEAL, 43076S NATIONAL OIL SEAL, 43086S NATIONAL OIL SEAL, 43089S NATIONAL OIL SEAL, 43095S NATIONAL OIL SEAL, 4310 NATIONAL OIL SEAL, 43290S NATIONAL OIL SEAL, 4370 NATIONAL OIL SEAL, 4370N NATIONAL OIL SEAL, 43X55X8 NATIONAL OIL SEAL, 43X65X8 NATIONAL OIL SEAL, 440131 NATIONAL OIL SEAL, 440265 NATIONAL OIL SEAL, 440511 NATIONAL OIL SEAL, 44052 NATIONAL OIL SEAL, 44053 NATIONAL OIL SEAL, 440972 NATIONAL OIL 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450322 NATIONAL OIL SEAL, 450323 NATIONAL OIL SEAL, 450324 NATIONAL OIL SEAL, 450329 NATIONAL OIL SEAL, 450330 NATIONAL OIL SEAL, 450331N NATIONAL OIL SEAL, 450332 NATIONAL OIL SEAL, 450333 NATIONAL OIL SEAL, 450335 NATIONAL OIL SEAL, 450336 NATIONAL OIL SEAL, 450339 NATIONAL OIL SEAL, 450341 NATIONAL OIL SEAL, 450342 NATIONAL OIL SEAL, 450343 NATIONAL OIL SEAL, 450347 NATIONAL OIL SEAL, 450350 NATIONAL OIL SEAL, 450351 NATIONAL OIL SEAL, 450352 NATIONAL OIL SEAL, 450354 NATIONAL OIL SEAL, 450358 NATIONAL OIL SEAL, 450359 NATIONAL OIL SEAL, 450360 NATIONAL OIL SEAL, 450361 NATIONAL OIL SEAL, 450362 NATIONAL OIL SEAL, 450363 NATIONAL OIL SEAL, 450375 NATIONAL OIL SEAL, 450381 NATIONAL OIL SEAL, 450385S NATIONAL OIL SEAL, 450389 NATIONAL OIL SEAL, 450394 NATIONAL OIL SEAL, 450400 NATIONAL OIL SEAL, 450400V NATIONAL OIL SEAL, 450415 NATIONAL OIL SEAL, 450418 NATIONAL OIL SEAL, 450431 NATIONAL OIL SEAL, 450433 NATIONAL OIL SEAL, 450435 NATIONAL OIL SEAL, 450441 NATIONAL OIL SEAL, 450444 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