Smaller double-row angular contact ball bearings do not have a fillingslot (Figure 1.15a and b) so that they can be axially loaded from both sides.
较小的双列角接触球轴承没有填充槽(图1.15 a和b)，使他们可以从双方的轴向加载。
2
Larger double-row angular contact ball bearings have a fillingslot (Figure 1.15c and) on one side and a machined brass cage or a pressed sheet-steel waved-ribbon cage per ball set.
All kinds of structural adhesives emerged subsequently such as carbon fiber adhesive, anchor adhesive, slotfilling adhesive and so on met the various needs in the field of civil engineering.