JB/T 6640-2007 滚动轴承 带座外球面球轴承 代号方法

JB/T 6640-2007 JBT 6640-2007 The method of designation for ball bearings with a fixed outer race JB/T is the abbreviation for the standard name of the Chinese standard. The translation of "JBT 6640-2007" is "JBT 6640-2007". "The method of designation for ball bearings with a fixed outer race" refers to the standard method for the designation of rolling bearing with a fixed outer ball bearing surface. The corresponding English translation of "the method of designation for ball bearings with a fixed outer race" is "the method of designation for ball bearings with a fixed outer spherical bearing"