diff --git a/MainWindowViewModel.cs b/MainWindowViewModel.cs
index cd80745..66d82cf 100644
--- a/MainWindowViewModel.cs
+++ b/MainWindowViewModel.cs
@@ -47,6 +47,7 @@ namespace DrillTools
         private const int SvsiFocused = 0x10;
         private const int SelectFileFlags = SvsiSelect | SvsiDeselectOthers | SvsiEnsureVisible | SvsiFocused;
         private const double PpSourceDiameter = 3.203;
+        private const double MinDiameterExcludedDiameter = 0.749;
         private const int PpSideCoordinateTolerance = 1500;
 
         [DllImport("user32.dll")]
@@ -1863,6 +1864,13 @@ M30";
                 // 添加详细的刀具信息日志
                 System.Diagnostics.Debug.WriteLine($"[刀具分析] T{tool.ToolNumber:D2}: 直径={tool.Diameter:F3}, 类型={tool.ToolType}, 尾号类型={tool.ToolSuffixType}, 大类={tool.ToolCategory}");
 
+                // 0.749mm 不参与最小孔径显示，刀具本身仍保留在列表和后续业务流程中。
+                if (Math.Abs(tool.Diameter - MinDiameterExcludedDiameter) < 0.001)
+                {
+                    System.Diagnostics.Debug.WriteLine($"[最小孔径排除] T{tool.ToolNumber:D2}: 直径={tool.Diameter:F3} 不参与最小直径计算");
+                    continue;
+                }
+
                 // 根据刀具类型分类计算最小直径
                 if (tool.ToolType == ToolType.Regular)
                 {