圆钢管夹 (JB/ZQ4519-97 系列管子卡箍 ) a D0 公称通径 DN b d2 d3 A h1 a D0 公称通径 DN b d2 d3 A h1 h2 mm in mm in 30 25 20 3/4 40 10 M10 40 70 30 25 20 3/4 40 10 M10 40 70 28 30 28 20 3/4 40 10 M10 40 70 30 28 20 3/4 40 10 M10 40 70 28 38 32 25 1 40 10 M10 48 76 38 32 25 1 40 10 M10 48 76 31 38 34 25 1 40 10 M10 48 76 38 34 25 1 40 10 M10 48 76 31 46 38 32 11/4 50 10 M10 56 86 46 38 32 11/4 50 10 M10 56 86