Pull-out spanner for processing chamfering bolt

The utility model relates to a dismounting spanner to deal with cap bolt, particularly to a dismounting spanner which is applicable to different bolts, with good fastening and positioning nature. The product is composed of a switching sleeve, a pseudaxis and a locking part. The pserdaxis is inserted into the end of the switching sleeve, while a containing arc groove showing as semi-circle is formed at one side of the pseudaxis, and the locking part opposed to an arc support surface is positioned in the containing arc groove, a inclined cone section is formed at the front end of the pseudaxis and locking part, and a flexible part is positioned to support the surrounding edge of the locking part and the pseudaxis to make a clamp side edge generate out of the edge of the pseudaxis at one side of the locking part. Through the above design, when the pseudaxis with locking part is inserted into the inner club bolt or a the crosshead bolt, the clamp side edge outstand of the locking part can be used to lock the corresponding corner or groove to improve the locking efficiency, and assist to dismount the cap bolt.