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。

415073V NATIONAL OIL SEAL, 415075 NATIONAL OIL SEAL, 415076 NATIONAL OIL SEAL, 415077 NATIONAL OIL SEAL, 415082 NATIONAL OIL SEAL, 415082N NATIONAL OIL SEAL, 415086 NATIONAL OIL SEAL, 415088 NATIONAL OIL SEAL, 415088N NATIONAL OIL SEAL, 415090 NATIONAL OIL SEAL, 415093 NATIONAL OIL SEAL, 415095 NATIONAL OIL SEAL, 415098N NATIONAL OIL SEAL, 415110 NATIONAL OIL SEAL, 415116 NATIONAL OIL SEAL, 415124 NATIONAL OIL SEAL, 415130 NATIONAL OIL SEAL, 415134 NATIONAL OIL SEAL, 415138 NATIONAL OIL SEAL, 415140 NATIONAL OIL SEAL, 415142 NATIONAL OIL SEAL, 415146 NATIONAL OIL SEAL, 415146N NATIONAL OIL SEAL, 415147 NATIONAL OIL SEAL, 415149V NATIONAL OIL SEAL, 415154 NATIONAL OIL SEAL, 415156N NATIONAL OIL SEAL, 415160 NATIONAL OIL SEAL, 415162 NATIONAL OIL SEAL, 415164 NATIONAL OIL SEAL, 415170 NATIONAL OIL SEAL, 415172 NATIONAL OIL SEAL, 415175 NATIONAL OIL SEAL, 415177 NATIONAL OIL SEAL, 415179 NATIONAL OIL SEAL, 415185 NATIONAL OIL SEAL, 415187 NATIONAL OIL SEAL, 415192 NATIONAL OIL SEAL, 415195 NATIONAL OIL SEAL, 415196 NATIONAL OIL SEAL, 415200 NATIONAL OIL SEAL, 415234 NATIONAL OIL SEAL, 415245 NATIONAL OIL SEAL, 415248 NATIONAL OIL SEAL, 415259 NATIONAL OIL SEAL, 41526S NATIONAL OIL SEAL, 415272N NATIONAL OIL SEAL, 415273 NATIONAL OIL SEAL, 415281 NATIONAL OIL SEAL, 415284 NATIONAL OIL SEAL, 415295 NATIONAL OIL SEAL, 415302 NATIONAL OIL SEAL, 415303 NATIONAL OIL SEAL, 415304 NATIONAL OIL SEAL, 415312 NATIONAL OIL SEAL, 415322N NATIONAL OIL SEAL, 415349 NATIONAL OIL SEAL, 415351 NATIONAL OIL SEAL, 415354 NATIONAL OIL SEAL, 415355 NATIONAL OIL SEAL, 415364 NATIONAL OIL SEAL, 415379 NATIONAL OIL SEAL, 415379H NATIONAL OIL SEAL, 415389 NATIONAL OIL SEAL, 415394 NATIONAL OIL SEAL, 415437 NATIONAL OIL SEAL, 415442 NATIONAL OIL SEAL, 415447 NATIONAL OIL SEAL, 415449 NATIONAL OIL SEAL, 415458 NATIONAL OIL SEAL, 415479 NATIONAL OIL SEAL, 415480 NATIONAL OIL SEAL, 415483 NATIONAL OIL SEAL, 415487 NATIONAL OIL SEAL, 415498 NATIONAL OIL SEAL, 415513 NATIONAL OIL SEAL, 415517 NATIONAL OIL SEAL, 415551 NATIONAL OIL SEAL, 415551N NATIONAL OIL SEAL, 415559 NATIONAL OIL SEAL, 415563N NATIONAL OIL SEAL, 415613 NATIONAL OIL SEAL, 415634 NATIONAL OIL SEAL, 415645 NATIONAL OIL SEAL, 415655 NATIONAL OIL SEAL, 415683 NATIONAL OIL SEAL, 415711 NATIONAL OIL SEAL, 415712 NATIONAL OIL SEAL, 415725 NATIONAL OIL SEAL, 415836 NATIONAL OIL SEAL, 415836N NATIONAL OIL SEAL, 415867 NATIONAL OIL SEAL, 415894 NATIONAL OIL SEAL, 415920 NATIONAL OIL SEAL, 415937 NATIONAL OIL SEAL, 415938 NATIONAL OIL SEAL, 415958 NATIONAL OIL SEAL, 415960 NATIONAL OIL SEAL, 415983 NATIONAL OIL SEAL, 415983N NATIONAL OIL SEAL, 415984 NATIONAL OIL SEAL, 415991 NATIONAL OIL SEAL, 415991N NATIONAL OIL SEAL,