螺栓是五金緊固件中常常會用到，但是螺栓大小有很多種，不同區域使用的螺栓是不同的，如果螺栓太大或者太小將無法使用。那么螺栓的規格型號有哪些呢？是如何表示的呢？我們馬上來看看相關知識吧。
Bolts are often used in hardware fasteners, but there are many bolt sizes. The bolts used in different areas are different. If the bolts are too large or too small, they will not be used. What are the specifications and models of bolts? How is it expressed? Let's take a look at the relevant knowledge right away.
一、螺栓的規格型號及表示方法
1、 Specification, model and representation of bolts
螺栓的規格型號一般用字母“M”表示，規格有M6、M8、M10、M12、M14、M16、M18、M20等。以M 16-5g6g為例，其表示普通螺紋公稱直徑為16cm，右旋，公差帶中徑 5g，大徑為 6g的意思。如果是M16×1 LH-6G，代表細牙螺紋，公稱直徑為16，螺距1cm，左旋，大徑為6G，旋合長度根據中等長度來考慮。
The specifications and models of bolts are generally represented by the letter "m", and the specifications include M6, M8, M10, M12, M14, M16, M18, M20, etc. Taking m 16-5g6g as an example, it means that the nominal diameter of ordinary thread is 16cm, right-handed, the pitch diameter of tolerance zone is 5g, and the major diameter is 6G. If M16 × 1 lh-6g represents fine thread, with nominal diameter of 16, pitch of 1cm, left-handed, major diameter of 6G, and the screwing length is considered according to the medium length.
二、螺栓種類有哪些
2、 What are the types of bolts
1、根據受力情況分，有普通螺栓及鉸制孔用螺栓。
1. According to the stress conditions, there are ordinary bolts and bolts for reaming holes.
2、根據頭部形狀分，可分為六角、方形、圓型、和沉頭……其中六角屬于較為常見的螺栓。
2. According to the shape of the head, it can be divided into hexagon, square, round and countersunk... Among them, hexagon belongs to the more common bolt.
3、按螺紋牙型分為粗牙、細牙兩種。
3. According to the thread profile, it is divided into coarse teeth and fine teeth.
4、按螺栓性能等級可以分為3.6、4.8、5.6、8.8、10.9以及12.9等等，8.8級以上的屬于低碳合金鋼材質螺栓，擁有高強度，而8.8級以下算普通螺栓。
4. According to the bolt performance grade, it can be divided into 3.6, 4.8, 5.6, 8.8, 10.9 and 12.9. Bolts above grade 8.8 belong to low-carbon alloy steel bolts with high strength, while bolts below grade 8.8 are ordinary bolts.
5、按螺栓制作精度分為三級，分別是A、B、C，屬于精制螺栓，常常用在于車床加工，一般性能等級為8.8， C屬于粗制螺栓，等級為4.8級，常常用在臨時固定。
5. According to the bolt manufacturing accuracy, it is divided into three levels: A, B and C. they are refined bolts, which are often used for lathe processing. The general performance level is 8.8. C is a rough bolt, which is level 4.8. They are often used for temporary fixing.
