<p>公称尺寸和实际尺寸<br />
A、公称尺寸:是标准中规定的名义尺寸,是用户和生产企业希望得到的理想尺寸,也是合同中注明的订货尺寸。 B、实际尺寸:是生产过程中所得到的实际尺寸,该尺寸往往大于或小于公称尺寸。这种大于或小于公称尺寸的现象称为偏差。<br />
偏差和公差<br />
A、偏差:在生产过程中,由于实际尺寸难于达到公称尺寸要求,即往往大于或小于公称尺寸,所以标准中规定了实际尺寸与公称尺寸之间允许有一差值。差值为正值的叫正偏差,差值为负值的叫负偏差。 B、公差:标准中规定的正、负偏差值绝对值之和叫做公差,亦叫"公差带"。 偏差是有方向性的,即以"正"或"负"表示;公差是没有方向性的,因此,把偏差值称为"正公差"或"负公差"的叫法是错误的。</p>
<p>不锈钢无缝管 321 φ57*3-4 温州 29300 0 0 0 <br />
不锈钢无缝管 321 φ76*4-6 温州 29100 0 0 0 <br />
不锈钢无缝管 321 φ89*4-5 温州 29200 0 0 0 <br />
不锈钢无缝管 304 φ25*2 温州 23300 0 0 0 <br />
不锈钢无缝管 304 φ32*2 温州 23100 0 0 0 <br />
不锈钢无缝管 304 φ45*3-4 温州 22800 0 0 0 </p>
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