7 little known and interesting facts about bolts Classic foundation, folding

7 little known and interesting facts about bolts Classic foundation, folding Fastening tools are now the most important elements from the production of the smallest parts to construction and industry.

It is known that the first threaded bolts were used as early as the 15th century, when small parts were invented. Few people know that there are 7 little-known and interesting facts about bolts.

Note: A bolt is a fastener - a rod with an external thread, basically a hexagonal head for a wrench, which is used to connect parts at one point.

Few facts from history

As mentioned earlier, the history of the bolt begins in the distant fifteenth century.

The Great Industrial Revolution accelerated the proliferation of fasteners, and bolts became simply indispensable in the construction of the most complex mechanisms.

Before the screw-lathe appeared, it was not possible to make threads of one caliber. It was built by the great machine tool builder G. Maudsley, who revolutionized the screw connection.

Already in the middle of the 19th century, machine tool production gave way to shaping, carried out using the cold method using wire and steel rods.

The wire is fed into the bolt cutter, which cuts the rod of the desired size. Then it goes into the stamp, after which a thread is applied to the workpiece. This method is used in our time.

If you don't know, then the bolt can be confused with the screw.

Let us analyze how the bolt differs from the screw?


First, differ in the way of fastening parts.

The bolt goes through the part and is fastened with a nut, and the screw is screwed into the threaded part.

The screw fixes the part during twisting, and the bolt is static. It is secured with a hook. And the screw can be fixed with a screwdriver. The head of the screw goes deep into the part, and remains outside of the bolt.

The screw is threaded along the entire length, and the bolt only half. Bolts are not small in size, unlike screws.

Note: There are also similar fasteners - a self-tapping screw and a screw. A self-tapping screw is a type of screw and a screw is a separate fastener.


The base of the bolt is represented by a threaded rod onto which the nut is screwed.

The bolt can be threaded along the entire length of the rod, or not fully threaded.

The classic bolt is a bolt with a hex head. As mentioned earlier, these bolts are the most commonly used.

Other species are used very rarely. These include such as eyebolt, anchor, bolts with a countersunk or semicircular head, folding, etc.

. More complex connections are created with these bolts.

All bolts are classified according to standardization and strength level. Therefore, when choosing, be sure to pay attention to GOST.

Let's list several main types of bolts:

  • foundation;
  • folding;
  • close-fitting;
  • stepped.

7 little known and interesting facts about bolts Classic foundation, folding Foundation or anchor bolts are mainly used for strengthening the blocks at the base. They have a high class of reliability and strength, and also have a special fastening system. The bolt, according to the principle of an anchor, is cut into a block fixed to the wall. Manufactured using high quality steel grades. The size of such a bolt can be from 150 mm to several meters.

There are removable, curved, integral, straight type.

Stepped in contrast to other moderate size flat head. Most often, this type of bolt is used in industry and manufacturing, mechanical engineering, etc. They are made of high-strength steel with a galvanized galvanized coating.

Folding type of bolt is used when making quick couplings.

Used in mechanical engineering for fixing various parts. According to standards and regulations, they are made using carbon steel or stainless steel. Thanks to this, the fastener is protected against corrosion.

High precision precision bolt is installed in the pre-machined hole. It differs from other types of cutting work.

Such a bolt sits very tightly in the hole with no play. These bolts have a small hex head.

Little known and interesting facts about the bolt

Few people know that many interesting facts are connected with the bolt:

  • 7 little known and interesting facts about bolts Classic foundation, folding Going back to the fifteenth century, all parts of the Milanese armor were bolted together, so that all their parts were movable;
  • During the construction of the modern Crimean bridge, about 800 thousand bolts were used, the weight of which is equal to three Boeing-747 aircraft;
  • Several decades ago, the word was associated with an arrow shot from a crossbow;
  • The Norwegian sculptor presented a collection of sculptures made of bolts with the name "Living bolts";
  • If a nut connection is made, it will be called a bolted connection, and if a fastening element is included in a part, it will already be called a screw connection;
  • A Jamaican short-distance athlete named Usain Bolt;
  • There are currently bolts with a torque indicator, i.e. when too much When the bolt is tightened, the indicator is red, and when not tightened, it is black.


It's surprising that fasteners invented a long time ago are still relevant to this day. They are used in the production of goods, in construction, they are responsible for the connection of complex structures and mechanisms.

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