Does bolt 8k mean level 8? Is 8 8 galv a galvanized bolt that means 8 8 grade?

The expression of bolt 8k means that the number is 8000 pieces, not the grade. If you want to indicate grade 8 (US screw strength grade), G8 will be used to represent grade galvgalv stands for galvanizing, which does mean electroplating.

Stands for Strength Grade. So there is no problem with your judgment later.

Bolt: consists of a head and a screw (a cylinder with an external thread.

A type of fastener composed of two parts, which needs to be matched with a nut to fasten and connect two parts with through holes.

Because bolts are also a type of railway fittings, railway fittings are an integral part of railway lines, and the tracks referred to here include steel rails.

Sleepers, connecting parts, track beds, anti-climb equipment, rail braces and switches, etc.

As a monolithic engineering structure, the track is laid on the roadbed, plays a guiding role in the operation of the train, and directly bears the huge pressure of the rolling stock and its load.

Under the power of train operation, its various components must have sufficient strength and stability to ensure that the train runs safely, smoothly and uninterruptedly in accordance with the specified maximum speed.

You don't write it completely, 8k should refer to the reaming bolt, and the geometric dimensional tolerance of the surface of the hole mating is k level, which is a slightly tighter base hole transition fit than h, j, js; The latter indicates the strength of the bolt material; The intensity levels are divided into9 and other multi-level; (One hundredth of the strength limit before the decimal point and 10 times the yield limit (or 10 times the ratio to the strength limit) after the decimal point.)

8k is 8000 pcs.

The understanding is right.

The performance of the grade bolt is: tensile strength = 800MPa, yield strength = 800*.

What does the grade behind the bolt and the 8 grade behind the nut mean, Yu Wenlong, a fastener consultant, believes that the grade behind the bolt and the 8 grade behind the nut are the performance grades of the bolt nut, and the grade behind the bolt indicates that the bolt is a grade bolt, and the grade 8 behind the nut indicates that the nut is a grade 8 nut. Yu Wenlong, a fastener consultant, believes that it is best to check the relevant information by yourself, and it is always fake on the Internet. The light ones are unqualified in terms of product quality, and the heavy ones will be fined.

Of course, fastener consultant Yu Wenlong believes that if you have the strength, ask a fastener consultant to refer to your technology, grasp the direction of enterprise development, positioning products, positioning customers is also a good choice.

Dear, I am glad to answer for you: there are more than 10 grades of bolt performance grades; Its intermediate and above bolts are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched, tempered), collectively referred to as high-strength bolts, and the rest are collectively referred to as ordinary bolts. The bolt performance grade is composed of two numbers, which represent the nominal tensile strength value and yield ratio of the bolt material.

The meaning is: the first 8 represents the tensile strength rmrm = 8 100 n mm2 = 800 n mm2 = 800 mpa second,8 is the yield ratio, which means that the tensile strength rm=4 100 n mm2=400 n mm2=400mpa yield strength re=400 and the strength grade of the bolt is different, the general grade of the bolt is made of 45 steel, and the grade is made of Q235-A, but it is not limited to the above two materials; The corresponding national standard standards are also different, such as:

GB T: Cross groove countersunk screws Part 1: Steel grade GB T:

Cross groove countersunk screws Part 2: steel grade, stainless steel A2-50, non-ferrous metal CU2 or CU3 GB: "Large hexagon head bolts for bolted structures Thread length according to GB T3106 C grade and grade".

Summary. The grade behind the bolt and the grade 8 behind the nut are all performance grades of the bolt nut.

What do the stages behind the bolt and the 8 levels behind the nuts mean.

The grade behind the bolt and the grade 8 behind the nut are all performance grades of the bolt nut.

When the bolt and nut nut are linked, it is a steel structure connection, and this connection is divided into several grades, which are: More than 10 grades The performance level is composed of two parts: the nominal tensile strength value and the yield ratio are:

Nominal tensile strength = value yield ratio = 8 Extended information: It is the tensile strength, yield strength and other mechanical material properties. Commonly used mechanical properties include:

Strength, plasticity, hardness, impact toughness, multiple impact resistance and fatigue limit, etc. The mechanical performance index corresponds to the mechanical performance.

The bolt grade means that the shear stress that the bolt is able to withstand is, and the bolt grade means that the bolt is able to withstand the shear stress is. The number of stages of the bolt refers to the mechanical grade, taking the grade as an example, 10 represents the tensile strength index of the bolt is 1000MPa, and it represents the yield ratio of the bolt, that is, the ratio of the yield strength index of the bolt to the tensile strength index.

Grade bolt means that the performance level of the bolt is.

Because the surface of the bolt is generally oxidized, the surface of the bolt is generally black. The grade bolt represents the performance class of the bolt, and the maximum tensile strength of the bolt is 800 MPa, and the maximum yield strength of the bolt is 640 MPa.

There are many names for bolts, and each person's name may be different, some people call it a screw, some people call it a bolt, and some people call it a fastener. Although there are so many names, they all mean the same, they are all bolts. Bolts are the universal term for fasteners.

A bolt is a tool that uses the physical and mathematical principles of the oblique circular rotation and friction of an object to tighten the mechanical parts of the object step by step.

Precautions for the use of bolts and nuts

1. Before using bolts and nuts, be sure to clean up all the oil, burrs, floating rust, welding nodules, etc. on the surface of bolts and nuts, so that the surface is clean and free of impurities.

2. If you want to use bolts and nuts, you must choose to buy matching products for use, and it is best not to match them at will, otherwise it is easy to cause the bolts and nuts to be not tightly connected, which will affect the normal use of users.

3. When installing bolts and nuts, the position of the friction parts of the bolts and attitude nuts must be kept dry, so it is recommended that you do not install bolts and nuts in rainy weather.

4. When installing bolts and nuts, you generally need to use a wrench, in order to ensure that there is no problem with the installation, it is recommended that you must check the wrench in detail before installing the bolts and nuts to see if the accuracy of the wrench torque is appropriate, and then use the wrench to rotate the bolts and nuts according to the correct tightening order.

The above content refers to Encyclopedia - Bolts.

.Grade 8 and grade refers to the performance grade of the bolt, which has nothing to do with the material of the bolt, and the definition of grade is: 4 represents 4 * 100 = 400MPa, which means that the tensile strength of the bolt is 400MPa, .,

8 is the yield ratio, and the nominal yield strength is 400. The performance of the grade bolt is: tensile strength = 800MPa, yield strength = 800*.

2. Methods of differentiation:

1) The general bolt is galvanized, so it is generally shiny silver, and the grade is blued (also called oxidation), and the surface is black.

2) Another difference is that the word yes or is generally written on the hexagonal head of the bolt.

The difference between the grade and grade of the bolt is that the material is not the same, the mechanical properties are not the same, the strength grade is not the same, the difference is very simple, use the HRC hardness tester to hit the hardness, the grade has no HRC hardness, and the HRC hardness of the grade is above HRC24.

Summary. Hello dear, I am glad to answer for you: the hardness of grade bolts refers to the hardness level of the material of the bolt.

In the international standard ISO 898-1, the hardness rating of bolts is divided into several grades, such as grade, grade, grade, etc. These grades represent the tensile strength and hardness of the bolt material. For grade bolts, the number 9 indicates a minimum tensile strength of 900 MPa (megapascals) and the number 8 indicates the hardness class of the bolt material.

The specific hardness values depend on the specific standard and manufacturer, usually in hardness class 8, with a hardness range of about 250 to 320 HV.

Dear, hello, I am glad to answer for you: the hardness of the grade family sells bolts refers to the hardness level of the material of the bolt. In the international standard ISO 898-1, the hardness rating of bolts is divided into several grades, such as grade, grade, grade, etc.

These grades represent the tensile strength and hardness of the bolt material. For grade bolts, the number 9 indicates a minimum tensile strength of 900 MPa (megapascals) and the number 8 indicates the hardness of the bolt material. The specific hardness value depends on the specific standard and manufacturer, but is usually in hardness class 8 with a hardness range of about 250 to 320 HV.

What is HRC hardness?

Are you there? HRC (Rockwell Hardness) is a commonly used hardness testing method to measure the hardness of materials. HRC hardness refers to the hardness value obtained by testing with a Rockwell hardness testing machine.

The HRC hardness value is usually between 0 and 100 and indicates the relative hardness of the material. In general, the higher the HRC hardness value, the harder the material. For example, the HRC hardness range of general steel is about 20 to 70.

The HRC hardness of the envy type of steel as hard as steel balls can reach more than 70.

I'm asking what is the hardness of the bolt strength grade HRC?

According to the ISO 898-1 standard, the HRC hardness range for grade bolts is typically between 32 and 39. This range indicates the phase and hardness of the bolt fuel, depending on the composition of the material and the heat treatment of the fuel and other factors. As a result, the HRC hardness of grade bolts generally fluctuates between 32 and 39.