定义是一种安装于槽轴上，用作固定零部件的孔向运动，这类挡圈的内径比装配轴径稍小。安装时须用卡簧钳，将钳嘴插入挡圈的钳孔中，扩张挡圈，才能放入预先加工好的轴槽上。学科紧固件(一级学科) ；标准件(二级学科) ；轴用弹性挡圈 (三级学科)；同义词轴用卡簧，轴用挡卡，轴用挡圈。相关类别孔用弹性挡圈，E形弹性挡圈，C形弹性挡圈，外锁夹紧挡圈，反向孔用弹性挡圈，反向轴用弹性挡圈。
一 按用途分类1．轴用弹性挡圈
a） 单孔轴用挡圈
b） 双孔轴用挡圈
2．反向轴用弹性挡圈
二 材料1） 碳素弹簧钢
2） 不锈钢
三 标准轴用开口弹性挡圈 Lock washers (retaining washers) for shafts
DIN 6799
孔用挡圈—标准型和重型 Circlips (retaining rings) for bores - Normal type and heavy type
DIN 472
轴用挡圈—带外凸耳型 Retaining rings with lugs for use on shafts (external circlips)
DIN 983
轴用钢丝挡圈及挡圈槽 Round wire snap rings and snap ring grooves for shafts and bores
DIN 7993
轴用挡圈—标准型和重型 Circlips (retaining rings)for shafts - Normal type and heavy type
DIN 471
孔用挡圈—带内凸耳型 Spring retaining rings with lugs for use in bores (internal circlips)
DIN 984
Circlips(retaining rings)for shafts
DIN 471
Circlips(retaining rings)for bores
DIN 472
Retaining rings with lugs
DIN 983
Spring retaining rings with lugs
DIN 984
Lock washers
DIN 6799
Round wire snap rings and snap ring grooves. For shafts bores
DIN 7993
