螺纹的公称直径(d)M3M4M5M6M8M10M12M14M16M18M20M22M24M27M30 ds3456810121416182022242730 d' 3.4 4.5 5.5 6.6911141618202224263033 dk 5.578.5101316182124273033364045 D' 6.589.5111417.5202326293235394348 k3456810121416182022242730 H' 2.7 3.6 4.6 5.57.49.21112.814.516.518.520.522.52528 H" 3.3 4.4 5.4 6.58.610.81315.217.519.521.523.525.52932 d2 2.6 3.4 4.3 5.1 6.98.610.412.214.215.717.719.721.224.226.7