石墨電極螺紋尺寸 電極直徑 接頭尺寸 接頭孔尺寸 螺距 mm in D L a2 I a1 H mm 100 150 200 250 300 350 400 450 500 4 6 8 10 12 14 16 18 20 69.85 92.08 122.24 152.40 177.80 203.20 222.25 241.30 269.88 -0.5 101.6 139.7 177.8 190.5 215.9 254.0 304.8 304.8 355.6 -1.0 40.3 56.2 80.0 108.0 129.2 148.2 158.8 177.9 198.0 -3.0 6 63.53 85.76 115.92 146.08 171.48 196.88 215.93 234.98 263.56 +0.5 53.80 72.85 91.90 101.30 114.00 133.00 158.40 158.40 183.40 0～+7 6.35 250 300 350 400 450 500 10 12 14 16 18 20 155.58 177.17 215.90 241.30 273.05 298.45 -0.5 220.1 270.9 304.8 338.6 355.6 327.5 -1.0 103.8 116.9 150.0 169.8 198.7 221.3 -3.0 10 147.14 168.73 207.47 232.87 264.62 290.02 +0.5 113.05 138.45 155.40 172.30 180.80 189.25 0～+7 8.47