紧定套用于将圆锥孔调心轴承固定在无轴肩轴上，结构简单，工作可靠，轴承调换方便。它由称套、锁紧螺母、锁紧垫圈组成。主要型号为H系列，HE系列，HS系列，HA系列，OH系列。
Adapter sleeves are the most commonly used components for locating bearings with a tapered bore onto a cylindrical seating as they can be used on smooth or stepped shafts. They are easy to mount and require no additional location on the shaft. They are made up of sleeve, lock nut and lock washer. The main model No is H series, HE series, HS series, HA series and OH series.