简要说明：B71909-E-2RSD-T-P4S

B71909-E-2RSD-T-P4S （5）无保持架轴承
V-满装滚动体轴承。例：NU207V。 VT-带隔离球或滚子的满装滚动体轴承。例：51120VT。
（6）公差等级（包括尺寸精度和旋转精度）
P0-公差等级符合国际标准ISO规定的0级，代号中省略，不表示。 P6-公差等级符合国际标准ISO规定的6级。 P6X-公差等级符合国际标准ISO规定的6X级圆锥滚子轴承。 P5-公差等级符合国际标准ISO规定的5级。 P4-公差等级符合国际标准ISO规定的4级。 P2-公差等级符合国际标准ISO的2级（不包括圆锥滚子轴承）。 SP-尺寸精度相当于5级，旋转精度相当于4级（双列圆柱滚子轴承）。 UP-尺寸精度相当于4级，旋转精度高于4级（双列圆柱滚子轴承）。 HG-尺寸精度相当于4级，旋转精度高于4级，低于2级（主轴轴承）。
SKF圆柱滚子轴承补充代号

d/ds公称内径/单一内径(Nominal bore diameter/Single bore diameter)
dmp单一平面平均内径(Mean bore diameter;arithmetical mean of the largest samallest single bore diamerers measured in one radial plane)
△dmp单一平面平均内径偏差(dmp-d;Deviation of mean bore diameter from the nominal dimension)
△ds单一内径偏差(ds-d;deviation of single bore diameter from the nominal dimension)
Vdp单一径向平面内径变动量(Bore diameter variation;difference between the largest & smallest single bore diameters in one radial plane)
Vdmp平均内径变动量(dmp max-dmp min;Mean bore diameter variation;difference between the largest & smallest mean bore diameters)
D/Ds公称外径/单一外径(Nominal outside diameter/Single outside diameter)
Dmp单一平面平均外径(Mean outside diameter;arithmetical mean of the largest & smallest single outside diameters in one radial plane)
△Dmp单一平面平均外径偏差(Dmp-D;Deviation of mean outside diameter from nominal dimension)
△Ds单一外径偏差(Ds-D;Deviation of mean outside diameter from nominal dimension)
VDp单一径向平面外径变动量(Outside diameter variation;difference between the largest & smallest single outside diameter in one radial plane)
VDmp平均外径变动量(Dmp max-Dmp min;Mean outside diameter variation;difference between the largest & smallest mean outside diameters)
Bs/Cs内圈/外圈单一宽度(Single inner ring/outer ring width)
△Bs内圈单一宽度偏差(Bs-B; Deviation of a single inner ring width from nominal dimension)
△Cs外圈单一宽度偏差(Cs-C; Deviation of a single outer ring width from nominal dimension)
VBs内圈宽度变动量(Bs max-Bs-min; Variation of inner ring widths; difference between the largest & smallest single inner ring width)
VCs外圈宽度变动量(Cs max-Cs min; Variation of outer ring widths; difference between the largest & smallest single outer ring width)
B,C,T轴承公称宽度/高度(Nominal bearing width/height)
Ts轴承实际宽度/高度(Actual bearing width/height)
△Ts轴承实际宽度/高度偏差(Deviation of the actual bearing width/height)
Kia成套轴承内圈径向跳动(Radial runout of assembled bearing inner ring)
Kea成套轴承外圈径向跳动(Radial runout of assembled bearing outer ring)
Sd内圈基准端面对内圈的跳动(Side face runout of inner ring with reference to bore)