| 摘要 |
<p>A torque-limiting screw-threaded fastener has a body (10) provided with a principal head (11) by means of which that body may be rotated, the body being screw-threaded over at least part of its length. A socket (14) is formed in the principal head (11), a part (17) of a torque member (15) being non-rotatably received in that socket (14). The torque member has a sacrificial head (16) by means of which torque may be applied to the body. The sacrificial head (16) is arranged to shear off that part (17) of the torque member received in the socket (14) when a torque in excess of some predetermined value is applied to the sacrificial head. That part (17) remaining in the socket is appropriately coded so that an inspection of the principal head (11) will show the torque to which the fastener has been subjected.</p> |
