紧定套是常用部件，可将圆锥孔轴承（调心球轴承、调心滚子轴承）固定在圆柱形安装面，可以用在光轴（公制和英制）或阶梯轴（公制和英制）上。这种附件的安装简易，并且无需利用其它装置将其固定。 在光轴上使用时，轴承可以固定在轴上的任何位置。 在阶梯轴上使用紧定套时，与阶梯环配合使用，可以将轴承更准确地固定在轴上的给定位置，因此便于轴承的安装和拆卸。其结构简单，工作可靠，轴承调换方便、广泛使用于纺织、轻工、造纸、冶金、皮带运输及输送设备等行业。
Adapter sleeves are common components, which can fix tapered bore bearings (aligning ball bearings, spherical roller bearings) on cylindrical mounting surfaces,it can be used on optical shafts (metric&inch) or stepped shafts (metric&inch) . It is easy to install .When used on an optical shaft, the bearing can be fixed at any position on the shaft. When an adapter sleeve is used on a stepped shaft, it can be used in conjunction with a stepped ring to more accurately fix the bearing at a given position on the shaft, so it is easy to install and disassemble the bearing. Structure simple,work reliable, and the bearing exchange is convenient .It is widely used in textile, light industry, papermaking, metallurgy, belt transportation and conveying equipment industries