例：51120VT。（6）公差等級（包括尺寸精度和旋轉(zhuǎn)精度）P0-公差等級符合國際標準ISO規(guī)定的0級，代號中省略，不表示。 P6-公差等級符合國際標準ISO規(guī)定的6級。 P6X-公差等級符合國際標準ISO規(guī)定的6X級圓錐滾子軸承。 P5-公差等級符合國際標準ISO規(guī)定的5級。 P4-公差等級符合國際標準ISO規(guī)定的4級。 P2-公差等級符合國際標準ISO的2級（不包括圓錐滾子軸承）。 SP-尺寸精度相當(dāng)于5級，旋轉(zhuǎn)精度相當(dāng)于4級（雙列圓柱滾子軸承）。 UP-尺寸精度相當(dāng)于4級，旋轉(zhuǎn)精度高于4級（雙列圓柱滾子軸承）。 HG-尺寸精度相當(dāng)于4級，旋轉(zhuǎn)精度高于4級，低于2級（主軸軸承）。SKF圓柱滾子軸承補充代號d/ds公稱內(nèi)徑/單一內(nèi)徑(Nominal bore diameter/Single bore diameter) dmp單一平面平均內(nèi)徑(Mean bore diameter;arithmetical mean of the largest samallest single bore diamerers measured in one radial plane) △dmp單一平面平均內(nèi)徑偏差(dmp-d;Deviation of mean bore diameter from the nominal dimension) △ds單一內(nèi)徑偏差(ds-d;deviation of single bore diameter from the nominal dimension) Vdp單一徑向平面內(nèi)徑變動量(Bore diameter variation;difference between the largest & smallest single bore diameters in one radial plane) Vdmp平均內(nèi)徑變動量(dmp max-dmp min;Mean bore diameter variation;difference between the largest & smallest mean bore diameters) D/Ds公稱外徑/單一外徑(Nominal outside diameter/Single outside diameter) Dmp單一平面平均外徑(Mean outside diameter;arithmetical mean of the largest & smallest single outside diameters in one radial plane) △Dmp單一平面平均外徑偏差(Dmp-D;Deviation of mean outside diameter from nominal dimension) △Ds單一外徑偏差(Ds-D;Deviation of mean outside diameter from nominal dimension) VDp單一徑向平面外徑變動量(Outside diameter variation;difference between the largest & smallest single outside diameter in one radial plane) VDmp平均外徑變動量(Dmp max-Dmp min;Mean outside diameter variation;difference between the largest & smallest mean outside diameters) Bs/Cs內(nèi)圈/外圈單一寬度(Single inner ring/outer ring b)
