Bolt is a cylindrical fastening element with a hexagonal head and threaded body that connects the parts detachably using a nut, the tightening torque is generally applied to the nut.
What is The Difference Between A Bolt And A Screw
· When bolts are tightened with a spanner, they tighten much more strongly than screws. They are already bigger than screws in size.
· Bolt is usually tightened with the bolt nut. Screws are usually screwed onto a body.
· In addition, excessive labor and material consumption make manual screw production very expensive. That's why bolts and screws are automatically made on special machines without removing chips from the material.
· Some are used in very cold and some in hot environments. Even under these conditions, the connection must remain secure. Therefore, when making bolts, they must be made with technical and meteorological properties suitable for the working environment. Bolt meaning is very spesific on where it is used and how its going to utilized.
Bolt types and properties according to Head Shapes
· Hex Head Bolts
Hexagonal head bolts are the bolts that are frequently used in the assembly of machine parts in machinery and in the assembly of steel constructions in the construction industry. Thread shapes of bolts are made as normal or thin according to the features required by the job.
The threaded part of the bolt is determined by the place to be used. And according to the situation of the job, it is made with enough teeth or as a full-length gear.
· Allen Bolts
In cases where the seat of the bolt head is too narrow for the nut wrench to enter, or when the bolt head is not desired to stay out, cylindrical head countersunk key (Allen) bolts or Allen screws, which are smaller than the bolts, are used instead. You can find allen bolts by searching online with the phrase bolt and nut near me.
Head Bolts
· Countersunk Head Bolts
Countersunk bolts have thinner heads than cylindrical head bolts. If the head of the bolt should not be protruding when connecting thin materials, countersunk screws are used in such cases. The countersunk at the head of the bolt also allows the bolt to tighten in the center of its hole.
· Cylindrical Head Screws
Cylindrical head screws with a screwdriver channel at the head are used in connections small enough to be tightened and opened with screwdrivers. Sheet-thick parts are fastened with cylindrical screws and thicker parts with countersunk or lentil countersunk screws. These screws can be used on turned parts and many other heavy machine sectors.
Special Bolts
· Phillips Screwdriver Head Bolts
Phillips head screws tighten more strongly than screws with the same size. The most important benefit of Phillips screwdriver screws is that the blade does not deteriorate while tightening or loosening.
· Star bolt
Since the tightening force is divided into four arms by the star-shaped blade of the screwdriver, both strong tightening is achieved and the blade is not broken. Star-shaped screwdrivers are usually open to small screws.
Bolt Types According to Body Shapes
· Studs (Headless Bolts)
The stud is a shankless screw threaded on both sides. Studs are used in frequently disassembled and mounted connections. The stud is tightened very strongly to the machine body on one side so that it remains fixed.
After the part to be connected is attached to its place, bolt is tightened with the nuts to be attached to the studs. When the connected parts are to be removed, only the nuts are removed. The stud stays in place. With this method, deterioration of the screws on the main bodies is prevented.
· Tension Bolts
It is used on large shaft lengths, such as connecting rods and high pressure flange connections, where dynamic stresses (loads) are encountered. The long, thin shaft expands elastically during tightening.
As a shaft diameter, the thread contains approximately 90% of the core diameter. If these bolts are to perform their duties correctly, the tensioning bolts must be fastened with a high pre-tightening force. Tension bolts usually require a washer for you to use them properly.
Pins and Different Screws
· Screw Pins (Setskur)
Also called Setuskur. They are grub bolts with threads all over their body. These are mainly used to secure the position of workpieces such as gear wheels, pulleys and flywheels on shafts and axles. The ends are generally hardened and the shaft is shaped in different ways according to any fastening style.
This bolt is a headless bolt with a screw thread on its entire body.
· Sheet Screws
Sheet metal screws With a large pitch, sharp-edged screw thread. It is a generally hardened detachable connecting element used for connecting sheets up to 2.5 mm. As they are screwed in, the bolt and nutshapes the threads themselves.
The most important feature of sheet metal screws is that they have a large pitch, their teeth are sharp-edged and their ends are pointed.
· Smart Screws (Drill Screws)
It is similar to sheet metal screws in terms of their structure, but this bolt has an additional drill bit for drilling the core hole at the body end. With these bolts, parts can be joined up to 10 mm thick, which needs to be drilled. You can always use a bolt cutter if you made a mistake with those kind of bolts.
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