| 摘要 |
The spanner 10 is for use with fasteners such as polygonally-shaped nuts or threaded studs and bolts having polygonally-shaped heads. The spanner includes a head 18 defining a polygonally-shaped aperture 22 capable of engaging during use in a close fit with a nut or bolt head 102 of a fastener. An arm 16 extends from the head generally perpendicularly to a central axis of the aperture. The arm is capable of engaging with an abutment surface adjacent to the nut or bolt head of the fastener engaged by the spanner head upon rotation of the nut or bolt head under applied torque. The spanner head further defines a through passage 34 penetrating a face of the aperture and being at least partially threaded (34A, Figure 3) over part of its length. In use, a threaded member 48 may be screwed into the passage to contact under pressure a face of the nut or bolt head engaged by the spanner to prevent relative rotation between the spanner and the nut or bolt head. The arm 16 may form a second spanner head, preferably having an aperture 20 of a different size. |
