主要提出以下观点：锅炉吊杆用螺母的高度与螺纹公称直径之比不宜小于1。
Presents the following viewpoints:the radio between the height of the nut for boiler hanger rod and the diameter of screw shall not be less than 1.
而折边锥形封头一般焊接于两公称直径不同的筒体中间，使两公称直径不同的筒体连为一体！
While ruffled tapered header general welding in two different nominal diameter of cylinder, make two nominal diameter of different cylinder is an organic whole repeatedly!
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。
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。
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.
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