6437| 12
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外六角螺栓的公稱直徑與六角頭對邊的關系 |
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點評
從上表得出規(guī)律:外六角開口扳手規(guī)格大約是直徑M的1.5倍,。內六角扳手規(guī)格大約與直徑差不多,,大于M20時,差別比較大,。
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