환봉 규격 - 두께에 따른 무게 Diameter (m/m) Weight (kg/m) Diameter (m/m) Weight (kg/m) Diameter (m/m) Weight (kg/m) 5 0.154 25 3.85 100 61.7 6 0.222 25.4 3.95 108 73.5 7 0.302 26 4.17 110 74.6 8 0.395 27 4.49 115 81.6 9 0.499 28 4.83 120 88.8 9.52 0.599 30 5.55 125 96.3 10 0.617 32 6.31 130 101 11 0.746 35 7.55 137 104 12 0.888 36 7.99 140 121 12.7 0.995 38 8.9 13 1.04 38.1 8.95 14 1.21 40 9.87 15 1.39 42 ..