buttress thread
柯林斯词典
1. N a screw thread having one flank that is vertical while the other is inclined, and a flat top and bottom: used in machine tools and designed to withstand heavy thrust in one direction 偏梯形螺紋
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1. N a screw thread having one flank that is vertical while the other is inclined, and a flat top and bottom: used in machine tools and designed to withstand heavy thrust in one direction 偏梯形螺紋