| 摘要 |
An improved anchor device or fastening member which is particularly suited f or use in the attachment of various fixtures and equipment to masonry, concrete , and other hard and/or friable substrates includes a head (22) and a shank (2 4) depending therefrom. The shank has a first threaded portion (28) having a predetermined thread angle and a predetermined hardness, and a second thread ed portion (30) extends from the first threaded portion. The thread angle of th e first threaded portion is different than the thread angle of the second threaded portion. In addition, the hardness of the first threaded portion is softer than the hardness of the second threaded portion. This provided for a more ductile anchorage when the fastening member is engaged with the substra te. |
