What do the letters and numbers on the bolt heads mean, and why you should pay attention to them

Very often, when purchasing bolts, no one looks at the inscriptions made on their caps. The fact is that many of us simply do not understand what these numbers and letters are and why they are made there. In reality, this information is necessary and it is useful to know it.

When buying bolts, you should pay attention to the markings indicated on the head / Photo: chel.pulscen.ru

The letters or other designations in the upper part are the manufacturer's stamp / Photo: drive2.ru

These products have various markings and are usually indicated directly on the packaging. But when buying bolts without it, in bulk, only the symbols on the hats are visible. Above there are letters - the brand of the manufacturer. Each plant is obliged to put such a mark on its product.

Strength class is indicated below. According to GOST 1759.4-87, there are eleven categories from 3.6 to 12.9. Bolts of the same length and diameter with different strength classes can withstand different loads. Sometimes they differ significantly.

Sometimes there are bolts without any designations at all, or only one of them is present. It is undesirable to purchase them, but if there is no other way out, then it is better to use them where the load is minimal. It is not clear whether the manufacturer complied with GOST.

>>>>Ideas for life | NOVATE.RU<<<<

In addition to the usual ones, there are also special high-strength bolts. There is more information on their hats. In simple stores, they are rarely seen. They are used in assemblies and structures of various mechanisms undergoing severe stress. The marking of such bolts means the following:

1. manufacturer's stamp;

2. heat number;

3. strength class;

4. S - high strength hex bolt;

5. CL - for cold climates.

When buying bolts, it is really very useful to study such information, then it will not be difficult to decide which product is right for you.

It will be no less interesting and useful to find out how to sharpen a broken drill with high quality so that it will serve for more than one year.
A source: https://novate.ru/blogs/190521/59047/

IT IS INTERESTING:

1. A country where there are no unemployed and poor, and gasoline is cheaper than water

2. Why do American men wear a T-shirt under their shirt?

3. How many liters of gasoline remain in the tank when the light comes on (video)