How to write the warranty letter of expansion screws, and what is the GB standard of expansion screw

The content of the warranty letter should include: the national standard or factory standard that the product complies with, the number of samples, the sampling standard, the material test report, the length and thickness of the casing, the total length of the screw, the length and diameter of the thread, the thread fit tolerance and other mechanical dimensions (including the nut), the hardness, torsional shear stress, tensile stress and other mechanical properties, the thickness of the electroplating material and the coating, the oxidation resistance (such as the salt spray test: rust after a few hours in the hot salt spray steam), hydrogen embrittlement test and other chemical properties.

Go to the library and look up the information

The warranty includes the following aspects:

Specifications & Dimensions.

Chemical composition (material).

Experimental part. Other parts that need to be explained.

The content of the warranty letter should include: the national standard or factory standard that the product complies with, the number of samples, the sampling standard, the material test report, the length and thickness of the casing, the total length of the screw, the length and diameter of the thread, the thread fit tolerance and other mechanical dimensions (including the nut), the hardness, torsional shear stress, tensile stress and other mechanical properties, the thickness of the electroplating material and the coating, the oxidation resistance (such as the salt spray test: rust after a few hours in the hot salt spray steam), hydrogen embrittlement test and other chemical properties.

Look at the national standard book! You're talking about test reports. The test report includes the elemental content of the material, the maximum outer diameter of the head, the detection of the length, the detection of the rib, the test data of the thickness of the pipe and the test data of the length, whether it is consistent with the national standard parts manual, and the tensile force, hardness, torque, etc.

The warranty includes the following aspects:

Specifications & Dimensions.

Chemical composition (material).

Experimental part. Other parts that need to be explained.

That is, your products can meet the design indicators, and there are certificates and testing documents provided by the manufacturer.

It's what your product can meet.

GB6187 series, what experimental standard do you want? Pulla or what?? The standard of expansion screws is a bit much, and it seems that there is a whole bunch of GB30 GB76 messes.

GB T 22795-2008 Expansion anchor bolt for concrete Type and size.

National standard, referred to as national standard (GB).

In 1986, the state formulated a new standard for bolt standard parts, which is known as the new standard in the industry. GB5784 is a hexagon head bolt - thin rod - grade B product. i.e. GB5784 instead of GB30-76 GB21-76.

The difference between the new standard and the old standard is: M8, M10, M12, M14, M22 series products, there are differences in the width of the opposite side. In addition to the new products of the M22 series, the new standard products M8, M10, M12 and M14 have a head side that is 1mm smaller than the old standard side.

They are mm, and the new M22 series of new standards, the new standard is 2mm larger than the opposite side of the old standard, which should be paid special attention. For the thickness of the head, there is a slight difference between the new and old standards, and it can be used in cases where the requirements are not very strict.

According to the actual situation of the wall, different expansion screws are selected. Generally, there are the following types *150. 6*60：

The total length is 60 mm, the casing is 45 mm long, the diameter is 8 mm, the wall thickness is mm, and the surface is colored zinc plating; The screw rod is 60 mm long, 6 mm in diameter, 35 mm in threaded part, and 8 mm in bottom rod hammer, and the surface is color-plated zinc; The nut is octagonal with an outer diameter of 10 mm, with a thickness of 5 mm, and the surface is white zinc plated; The outer diameter of the gasket is 13 mm, the thickness is 1 mm, the inner diameter is 6 mm, and the surface is white zinc plating; The shrapnel is a ring with an outer diameter of 9 mm, an inner diameter of 6 mm, and a thickness of mm. 6*80: total length 80 mm, casing length 65 mm, diameter 8 mm, wall thickness mm, surface is color zinc plating; The length of the screw, the nut, the gasket, and the shrapnel are the same as above.

6*120: total length 120mm, casing length 105mm, diameter 8 mm, wall thickness mm, surface is color zinc plating; The length of the screw, the nut, the gasket, and the shrapnel are the same as above. 6*150：

The total length is 150mm, the casing is 135mm long, the diameter is 8 mm, the wall thickness is mm, and the surface is colored zinc plating; The length of the screw, the nut, the gasket, and the shrapnel are the same as above.

First, prepare an electric hammer and impact drill bit. The drill for drilling is not easy to use. Expansion screws have gold internal expansion screws, for example, if you choose 6mm, you need to use a 10mm impact drill bit.

There are also plastic expansion pipes with self-tapping screws, and the drill bit is used as big as the expansion pipe.

It is recommended that the little girl still do not do this work herself.

Choose one with bai

The expansion screw expansion ring (tube) is the same straight du

The diameter of the alloy drill head, mounted on the electric drill and then dao to carry out wall drilling, specialized.

The depth of the hole should be the same as the length of the bolt, and then the expansion screw kit should be lowered into the hole, remember; Do not unscrew the screw to prevent the bolt from falling into the hole when the hole is drilled deep and it is difficult to take it out.

After tightening the screw 2-3 buckles, feel that the expansion bolt is relatively tight and not loose, and then unscrew the screw, and then align the fixing parts with holes on the fixed item to the bolt, install the outer gasket or spring washer and tighten the screw.

6mm punch 10mm hole; 8mm punch 12mm holes, and punch wall holes according to the outer diameter of the expansion tube. If the brick wall is soft, choose a smaller drill bit. The expansion part should all enter the wall, as long as the threaded part is long enough, the deeper the casing part is, the stronger it is.

For more convenient installation of expansion screws, expansion screw installer application was born.

The expansion screw installer structure is specially designed for installing the expansion screw in a special environment, and comprises a hexagonal cylinder with an internal interface adapted to the expansion screw, wherein it also comprises at least one section of the pipe body, and the upper end of the pipe body is fixedly installed with the hexagonal cylinder; The upper part of the pipe body is provided with a percussion drill installation position. It can be used in the air with a percussion drill, and can be quickly and quickly tightened with an expansion screw or expansion boom 3-6 meters above the ground.

Just take a hole in the wall and put the expansion screw straight in, which I often do. However, pay attention to the size of the holes and screws in the wall.

Don't talk about it, find a boyfriend and let him do it for you. (Temporary ones are also OK, 88 when they run out).

Expansion screws are not easy to do, you still buy a few steel nails and nail them with a hammer!

Climb through! Earn 2 points! Hehe, that Dongdong I've only played with metal, so it's funny!

In Haikou? I'll help you, a professional sledgehammer in the army! Hehe.

Hehe, I can see that you are very serious!

First of all, I want to tell you: the content on the "Encyclopedia" is spontaneously collected and compiled by netizens, and the level is uneven, not authoritative, and not very reliable!

I also read the specific explanation of "expansion screw" in the "Encyclopedia", and the editor just made up a little content based on his own understanding and experience, which is very one-sided, and some are even misleading!

As for what you said, I'll explain it to you:

If the base layer is strong enough, like in a cast-in-place concrete floor slab, with the correct installation of qualified expansion screws, a diameter expansion screw of 8mm can withstand hundreds of kilograms of load without problems. And your ceiling fan is "light in weight, and there is a slight shaking when it is running", which is light in itself, and the weight is lighter when the ceiling fan is lifted upwards when it is running, and the vibration caused by the "slight shaking" is almost negligible to an expansion screw installed in place at a strong base. So this ceiling fan in your house has been a little shaky for 10 years, it is still very strong, and it will always be strong in the future!

According to my years of experience, the most feared thing about expansion screws is the fragile base layer, such as holes and walls with too low cement ratio.

The wall horizontal bar, as the name suggests, is installed on the wall, so the strength of the wall is very important. If it is a concrete (or solid red brick cement mortar masonry) wall, it is no problem to use M10*100 for a total of 8 expansion screws. (7 cm seems too short).

If the wall is a lightweight brick or hollow brick, the use of expansion screws will not work; In this case, it can be fixed with feed-through screws.

If the screws are nailed into the wood and tight enough, they will not loosen so easily.

It is definitely not possible to shake it, and it is recommended to sell the expansion screw with screw bristles, which is very strong.

Nothing is absolute, you just need to check it often, and if you find that the expansion screw is loose, you should replace it immediately to avoid danger.

All things are normal, the expansion screws are not afraid of shaking.

What the encyclopedia says also makes sense.,Then it's normal for you to check it.,It's normal to shake it if you don't worry.。

The grade of expansion bolts is divided into, and the material of expansion screws: mainly austenite.

A1, A2, A4, martensitic and ferrite C1, C2, C4, their representation methods such as A2-70 before and after ,-- respectively indicate the bolt material and strength grade, the following is the complete expansion bolt specification table.

No. 45 steel, for important or special-purpose threaded connections, can choose 15Cr, 20Cr, 40Cr, 15MnVB, 30CrMRSI and other alloy steels with high mechanical properties.

According to the actual situation of the wall, different expansion screws are selected. Generally, there are the following types *150.

6 60: total length 60 mm, casing length 45 mm, diameter 8 mm, wall thickness mm, surface is color zinc plating; The screw rod is 60 mm long, 6 mm in diameter, 35 mm in threaded part, and 8 mm in bottom rod hammer, and the surface is color-plated zinc; The nut is octagonal with an outer diameter of 10 mm, with a thickness of 5 mm, and the surface is white zinc plated; The outer diameter of the gasket is 13 mm, the thickness is 1 mm, the inner diameter is 6 mm, and the surface is white zinc plating; The shrapnel is a ring with an outer diameter of 9 mm, an inner diameter of 6 mm, and a thickness of mm.

6*80: total length 80 mm, casing length 65 mm, diameter 8 mm, wall thickness mm, surface is color zinc plating; The length of the screw, the nut, the gasket, and the shrapnel are the same as above.

6*120: total length 120mm, casing length 105mm, diameter 8 mm, wall thickness mm, surface is color zinc plating; The length of the screw, the nut, the gasket, and the shrapnel are the same as above.

6 150: total length 150mm, casing length 135mm, diameter 8mm, wall thickness mm, surface is color zinc plating; The length of the screw, the nut, the gasket, and the shrapnel are the same as above.

201 stainless steel bolt warranty, fastener consultant Yu Wenlong believes that 201 stainless steel bolt warranty and other screw warranties are the same, are chemical elements, mechanical properties, size and the like, are very good to do, but generally speaking, it is unlikely that someone will help you do it for free.

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, Yu Wenlong, a fastener consultant, believes that if you have the strength, please refer to your technology to infiltrate a fastener consultant, grasp the development direction of the enterprise, position the product, and position the customer is also a good choice.

Yu Wenlong, a fastener consultant, has been engaged in the fastener industry for many years, and has been engaged in technology, quality inspection, quality assurance, procurement, business, etc. in the fastener industry, and has accumulated rich industry experience, and has accumulated a large number of technical information, customer information, and supplier information.

Stuff it into the hole in the wall, lock the nut, and the nut pulls the screw out.

One end of the screw is threaded, and one end has a taper. There are several cuts in the half of the iron cylinder (steel pipe), and they are stuffed together into the hole made in the wall, and the lock nut pulls the screw outward, and the taper is pulled into the iron cylinder, and the iron cylinder is opened, so it is tightly fixed to the wall.

When the nut is tightened, the screw moves outward, and the cone part moves through the axial movement of the thread, and then forms a great positive pressure on the peripheral surface of the expansion tube, and the angle of the cone is very small, so that the friction self-locking between the wall, the expansion pipe and the cone is formed, and then the fixing effect is achieved.

Installation comes to the steps:

1. Select an electric hammer BAI drill bit with a larger size of 2mm than the expansion bolt model to punch holes (plastic expansion pipe DU needs a drill bit of the same size), and the depth of DAO is suitable for the length of the expansion pipe;

2. Put in the expansion bolt;

3. Choose the right tool to tighten the bolt according to the type of bolt

a. Ordinary expansion bolts: choose a dead wrench or a live wrench.

B. Metal internal expansion bolts: use dead wrench or live wrench or plum screwdriver c. Plastic expansion tube: use plum blossom screwdriver.

According to the actual requirements, it can be tightened to a certain extent.

Hello, the best expansion bolt installation is to consult a professional manufacturer, because they are a professional enterprise that produces bolts, there are the latest installation and use methods, for example, you can find Shanghai Xupu standard parts, is a very good manufacturer, you can have more technical advice with them, I hope to help you.