national6481S。Oilsealisusedtosealoil(oilisdrivesystemisthemostcommonliquidmaterial,alsoreferstothegeneralliquidsubstancemeaning)mechanicalelement,itwilldrivepartsneedlubricationcomponentsandoutputcomponentisolation,andnotletoilleakage.Staticsealanddynamicseal(generalreciprocatingmotion)withsealthatseal联系方式：手机：15392156553QQ：728661741NATIONAL油封特点。NATIONAL油封与其它品牌的最大不同之处，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，也是最主要的方面，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。NATIONAL油封分内包骨架油封和外露骨架油封，带自紧弹簧式和无自紧弹簧式。但NATIONAL油封最主要以外露骨架为主，常用的有41、45、47、48系列。外骨架油封相对于内骨架油封来言，刚性好、定位准确、同轴度高、导热散热好、加工精度高、要求胶与金属之间有较高的粘合强度。national6245Snational6283Snational6324Snational6329Snational6336Snational6340national6357Snational6358national6380national6389national6402Snational6426national6465Bnational6481national6481Snational6545national6547national6565Nnational6575Snational6584Snational6590Snational6597Snational6603national6612Snational6622national6626Snational6635Snational6636Snational6638Snational6643Snational6644national6668Snational6703Snational6704national6759Snational6760Snational6780Snational6781national6808Nnational6815national6818national6832Snational6835Snational6840Snational6855Nnational6859Snational6872Snational6873Snational6879Hnational6886Snational6906Snational6930national6936Snational6949Snational6957national6959national6960national6966Snational6971Snational6982Snational6985national6988Hnational7006Snational7013Snational7014Snational7021Snational7022Snational7028Vnational7028national7038Snational7044Nnational7105Snational7131national7154Snational7186Snational7188Snational7208Snational7214national7216national7230national7235Snational7245national7300Snational7338Nnational7354Vnational7354Nnational7378national7381Snational7387national7399Snational7412Snational7413national7456Nnational7457Nnational7486Snational7495Snational7506Nnational7512Snational7512Snational7537Snational7564national7568national75