国外阀门材料常用技术标准 镍合金棒材和线材热轧六角和八角棒材尺寸允许偏差
两对边之间测量的规定尺寸 in.(mm) |
规定尺寸的允许偏差,in.(mm) |
只用于六角三个测量尺寸的最 大差异in.(mm) |
|
上偏差(+) | 下偏差(-) | ||
1/4(6.35)~≤1/2(12.70) | 0.007(0.18) | 0.007(0.18) | 0.011(0.28) |
>1/2(12.70)~≤1(25.40) | 0.010(0.25) | 0.010(0.25) | 0.015(0.38) |
>1(25.40)~≤11/2(38.10) | 0.021(0.53) | 0.021(0.53) | 0.025(0.64) |
>11/2(38.10)~≤2(50.80) | 1/32(0.79) | 1/32(0.79) | 1/32(0.79) |
>2(50.80)~≤21/2(63.50) | 3/64(1.19) | 3/64(1.19) | 3/64(1.19) |
>21/2(63.50)~≤31/2(88.90) | 1/16(1.59) | 1/16(1.59) | 1/16(1.59) |
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