Hexagon flange face bolt 15, what is an outer hex bolt

When it comes to hex bolts, many people can know something, but for hex bolts, I think many consumers may not know what they are. Today, let's take a look at what is an external hexagon bolt for your reference.

Definition of hexagonal bolts.

Hexagon bolts, in fact, there are many names, such as can be called hexagon screws, for example, can be called hexagon screws. It can also be called an external hexagon bolt. It all means the same thing. It's just that the name is different.

1. Ordinary bolts are divided into three types: A, B and C. The first two are refined bolts and are rarely used. Generally speaking, ordinary bolts refer to C-level ordinary bolts.

2. In some temporary connections and connections that need to be disassembled, C-level and ordinary bolts are commonly used. Common bolts commonly used in building structures are M16, M20 and M24. Some rough bolts in the machinery industry may have a relatively large diameter and are used for special purposes.

Hexagon bolt grade performance.

The hexagon bolt performance grade is composed of two numbers, which represent the nominal tensile strength value and yield ratio of the bolt material.

For example, a bolt at the performance class level, which means:

1. The nominal tensile strength of the bolt material is up to 400MPa;

2. The yield ratio of the bolt material is;

3. The nominal yield strength of the bolt material is up to 400 grades.

Hexagon bolt burr original dust search cause.

1. Your clamp is not aligned with the trimming die, the trimming die should not be too large or too small, it is easy to drag the tail if it is small, and the trimming edge of the head is not correct when it is big. If there is a burr on the supporting surface, the ejector rod action of the trimming edge is fast or slow, and then the trimming die is worn, and it is also important to re-grind and pre-punch the forming.

2. In the production and manufacturing, especially when the screw head is beaten, the striking time is too fast. Or the opening of the punch is too small.

3. When the punch dies are cut and just leave the main mold, the back support hits the screw, and the ejector rod of the main mold is not fast or slow, just cut off.

4. The hardness of bolt raw materials is also related, and the hardness of the best raw materials for trimming bolts is above HRB88 degrees.

Of course, it is certain that when the hexagon bolt is cut, the burr must not only be due to the above reasons, but also for other reasons. But many of the above reasons are the main ones. Production screw personnel, in the future when encountering burrs on the cutting edge, we can refer to the above reasons.

Find out the detailed cause and what the problem is. Then step by step to solve the glitch problem.

Summary. Q36412 hexagonal flange face flange nut size standard.

Hexagon bolts can be used in processing technology, applied to the processing of any multi-sided inner hole, the outer edge of the screw head of the hexagon screw is round, and the middle is a concave hexagon, and the hexagon screw is a common screw.

The main method of bridge loss for hexagon bolt processing:

1. The forging method of using a die to upset a metal bar at room temperature.

2. It is usually used to make the heads of screws, bolts, rivets, etc. Cutting can be reduced or replaced.

Hexagonal law bai

Blue bolt national DU standard GB

The standard specifies that the thread size is M8

DAO1-M16, fine tooth thread, performance grade and A2-70, product equal grade A small answer hexagonal series fine pitch hexagonal flange face bolts.

Advantages: the head of ordinary bolts is very thick, difficult to deform, and if vibration occurs after loading, it needs to be re-tightened; The flange has a thin part, which can be slightly deformed and can be locked more strongly. There is also if you go up to the hole, ordinary bolts can not use tools, the head of the flange bolt is smaller, and the flange below also plays a fastening role, but you can use special tools to go up to the hole, and the hexagon bolt is about the same principle.

Then there is the flange top flat pad, which is safer on softer, non-wear-resistant materials and will not cause perforation.