螺栓规格尺寸的内容非常多，M代表三角螺纹，M后面的数代表公称直径，×号后面的数是表示螺栓去帽后的长度。例如：M6×30M代表三角螺纹，6代表螺纹的公称直径是6，也就是说是6个的螺纹，30代表螺栓去帽后的长度。
There are many specifications and dimensions of bolts. M represents triangular thread, and the number behind M represents nominal diameter, × The number after No. is the length of the bolt after the cap is removed. Example: M6 × 30M represents the triangular thread, 6 represents the nominal diameter of the thread is 6, that is, 6 threads, and 30 represents the length of the bolt after the cap is removed.
由头部和螺杆两部分组成的一类紧固件，需与螺母配合，用于紧固连接两个带有通孔的零件。如把螺母从螺栓上旋下，又可以使这两个零件分开，故螺栓连接是属于可拆卸连接。
A type of fastener consisting of head and screw shall be matched with nut to fasten and connect two parts with through hole. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolted connection is a removable connection.

国标螺栓一般分为两种：
GB bolts are generally divided into two types:
GB30螺栓、GB21螺栓，区别在于GB30的六角头比GB21的要大一些。材质均采用：Q235.等级为4.8级，硬度较弱，用于硬度要求低，不经常活动的部位，人们所谓的普通螺栓。 典型的用途：机械业、建筑业、的固定、紧固。
The difference between GB30 bolt and GB21 bolt is that the hexagonal head of GB30 is larger than that of GB21. Materials: Q235. The grade is 4.8, and the hardness is weak. It is used for the parts with low hardness requirements and infrequent activities, which are called ordinary bolts. Typical uses: fixing and fastening in machinery industry, construction industry, etc.
M=螺纹的直径 L=螺杆的长度 例如M24×70 就代表螺栓的直径为24mm 螺杆长度为70mm （不包括六角头）。
M=diameter of thread L=length of screw e.g. M24 × 70 means that the diameter of the bolt is 24mm, and the length of the screw is 70mm (excluding the hexagon head).
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