The value of tightening torque is relative not only to the nominal diameter and quality class of the bolt, but also to the security of the threaded fastener.

指出螺栓联接的扭紧力矩值不仅与螺栓的公称直径及性能等级有关，还与能否保证联接可靠工作有关。

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Compared to the new wheel tread, the worn tread is easy to form two-point contact nearby the depression area of the nominal diameter position of wheel tread.

与新用车轮踏面相比，测试得到的磨耗后车轮踏面在其名义直径位置凹陷区域附近容易形成踏面两点接触。

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It's suitable for the small caliber valve nominal diameter: airproof test and strength test of DN15/100 flange type, through-type gate valve, cut-off valve and ball valve etc.

适用于小口径阀门通径：DN15/100法兰式、直通式闸阀，截止阀，球阀等阀门的密封测试和强度测试。

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