普通级 高级 普通级 高级
6~10 ±0.20 ±0.15
﹥10~30 ±0.30 ±0.20
﹥30~50 ±0.40 ±0.30
﹥50 ±0.9%D ± 0.8%D
68~159 ±1.25%D ﹤ 15 +15%S/-12.5%S
﹥159~426 ±1.5%D ≥ 15 +20%S/-15%S
外径 壁厚
6~30 D≤38
>30~50 D>38
>50
类别 外径 类别 壁厚
﹤ 25.4
25.4~38.1
﹥38.1~50.8
≥50.8~63.5
≥63.5~76.2
≥76.2~101.6
﹥101.6~190.5
﹥190.5~228.6 ≤2.4
≤101.6 ﹥2.4~3.8
﹥101.6~190.5 ﹥3.8~4.6
﹥190.5~228.6 ﹥4.6
外径 壁厚
10.3~48.3 3.2~63.5
>48.3~114.3
76.2~457,
壁厚 /外