NATIONAL OIL SEALS是1920年由LIoyd A.Johnson創立的，專門從事油封、墊圈墊片的生產，在當時就已經是美國的油封生產廠家之一，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，通過不斷的發展和并購，擁有了一系列的汽車零部件品牌，產品包括軸瓦、引擎、雨刷、火花塞、軸承、油封、活塞環、制動系統、墊圈和底盤系統等等，成為了的汽車零部件供應商。

    NATIONAL油封制造基地從剛創立時的San Francisco， 至1942年搬到Redwood City，再后搬至Summerton和Mexico City，現已把制造重心放在了MEXICO CITY。這就是為什么油封上會標注為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，同樣起到內骨架油封(外徑包有橡膠)的密封效果。

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417501 NATIONAL OIL SEAL, 417502 NATIONAL OIL SEAL, 417503 NATIONAL OIL SEAL, 417504 NATIONAL OIL SEAL, 417507 NATIONAL OIL SEAL, 417511 NATIONAL OIL SEAL, 417512 NATIONAL OIL SEAL, 417513 NATIONAL OIL SEAL, 417514 NATIONAL OIL SEAL, 417515 NATIONAL OIL SEAL, 417522 NATIONAL OIL SEAL, 417525 NATIONAL OIL SEAL, 417530 NATIONAL OIL SEAL, 417531 NATIONAL OIL SEAL, 417534 NATIONAL OIL SEAL, 417535 NATIONAL OIL SEAL, 417537 NATIONAL OIL SEAL, 417538 NATIONAL OIL SEAL, 417539 NATIONAL OIL SEAL, 417540 NATIONAL OIL SEAL, 417543 NATIONAL OIL SEAL, 417550 NATIONAL OIL SEAL, 417551 NATIONAL OIL SEAL, 417554 NATIONAL OIL SEAL, 417555 NATIONAL OIL SEAL, 417556 NATIONAL OIL SEAL, 417562 NATIONAL OIL SEAL, 417563 NATIONAL OIL SEAL, 417564 NATIONAL OIL SEAL, 417584 NATIONAL OIL SEAL, 417596 NATIONAL OIL SEAL, 417597 NATIONAL OIL SEAL, 417600 NATIONAL OIL SEAL, 417603 NATIONAL OIL SEAL, 417606 NATIONAL OIL SEAL, 417621 NATIONAL OIL SEAL, 417698 NATIONAL OIL SEAL, 41787S NATIONAL OIL SEAL, 417986N 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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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