| 摘要 |
A threaded fastener is provided having a head for accommodating a tool for rotating the fastener. A plurality of ribs culminating in teeth are provided under the head for engaging the material into which the fastener is inserted, each rib and tooth having a ramp surface and a brake surface, the ribs being oriented for inhibiting either clockwise rotation or counter-clockwise rotation of the fastener by torque created through contact of the brake surfaces with the material. The ribs are formed on the fastener during the heading process by means of a matched die set.
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