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NATIONAL油封制造基地從剛創(chuàng)立時(shí)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(huì)標(biāo)注為USA和MX的緣故。除此兩處之外，NATIONAL油封再也沒(méi)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(zhuān)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(duì)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。

national oil seals是美國(guó)輝門(mén)公司旗下密封件品牌，是眾多發(fā)動(dòng)機(jī)、工業(yè)機(jī)械的原廠配套件。美國(guó)national 油封對(duì)每一個(gè)嚴(yán)格的應(yīng)用都提供***的性能和可靠性，從汽車(chē)到重型輪軸，到汽油和柴油曲軸，到農(nóng)業(yè)和工業(yè)設(shè)備。 每一個(gè) 美國(guó)national油封產(chǎn)品都有全新的創(chuàng)意，優(yōu)良的材料，***的制造水準(zhǔn)。
美國(guó)national英制油封以高性能高品質(zhì)適用于各種使用環(huán)境苛刻的地方，如重型卡車(chē)的輪軸、汽油/柴油機(jī)的機(jī)軸、礦山設(shè)備、齒輪箱、壓縮機(jī)等等，并已得到了美國(guó)nascar(美國(guó)汽車(chē)比賽協(xié)會(huì))的認(rèn)可。

NATIONAL油封441267 481419 470326英制鐵殼油封

NATIONAL油封441267 481419 470326英制鐵殼油封

NATIONAL OIL SEALS是1920年由LIoyd A.Johnson創(chuàng)立的，專(zhuān)門(mén)從事油封、墊圈墊片的生產(chǎn)，在當(dāng)時(shí)就已經(jīng)是美國(guó)的油封生產(chǎn)廠家之一，為汽車(chē)和飛機(jī)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(chē)零配件廠家，從1899年成立至今，通過(guò)不斷的發(fā)展和并購(gòu)，擁有了一系列的汽車(chē)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(dòng)系統(tǒng)、墊圈和底盤(pán)系統(tǒng)等等，成為了的汽車(chē)零部件供應(yīng)商。

NATIONAL油封441267 481419 470326英制鐵殼油封
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