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.
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。
Top view of roundhead slotted screw. Selection box represents thread diameter.
圆头一字槽螺钉的俯视图。选择框代表螺纹直径。
Top view of panhead slotted screw. Selection box represents thread diameter.
平头一字槽螺钉的俯视图。选择框代表螺纹直径。
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