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NATIONAL油封系列是以外露骨架為主。外骨架油封相對(duì)于內(nèi)骨架油封來(lái)言，剛性好、定位準(zhǔn)確、同軸度高、導(dǎo)熱散熱好、加工精度高、要求膠與金屬之間有較高的粘合強(qiáng)度。 NATIONAL油封與其它品牌的最大不同之處，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，也是最主要的方面，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油封全型號(hào)供應(yīng)

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national 1949	national 9541N	national 350567	national415479N	national 450224
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