FOERBAETTRAT BETONGFAESTE

摘要

A fastener (10) for securing directly to a bore (34) in concrete or masonry (36) without the use of plugs or anchors includes a shank (12), a head (14) at one end and a point (16) at the other end. It also includes a first screw thread (30) extending from the point (16) towards the head (14) and a second screw thread (32) of smaller diameter extending from the point (16) part of the length of the first screw thread. The second screw thread (32) stabilises and centres the fastener as it taps its way into the side wall of the bore (34) and the absence of the second screw thread (32) accommodates particulate material removed during the self-tapping operation to facilitate driving of the fastener (10).