A forged eye bolt is an overhead power line hardware that is used to connect dead end insulators in an overhead line. On wooden poles, the power line fitting is often used to connect the overhead line or even a dead end insulator. It is also known as the drop forged eye bolt or eye bolt.
Forged eye bolts are available in two distinct styles. There are two types of eye bolts: oval eye bolts and round eye bolts. A thimble is attached to the forged oval eye bolt. This thimble will stay locked when the eye bolt is connected to the clevis or a dead end insulator.
Typically, forged eye bolts are joined using square and hex nuts. Once the eye bolt has passed through the wooden pole, the nut is subsequently secured to the eye bolt.
Our forged eye bolts are constructed entirely of galvanized steel without welds. This ensures the durability of this electric power line fitting.
Galvanization is used to prevent corrosion. These power line hardware will not be harmed by water or other substances.
The Guide to buy Eye Bolts
Eye bolts are a kind of steel fastener that are often applied in a broad variety of industrial applications for lifting, hoisting, anchoring, pushing, and pulling.
There are several kinds and materials of eye bolts available for a variety of applications, making it critical to understand and choose the appropriate product.
What is an eye bolt?
An eye bolt is a mechanical fastener that consists of a threaded shaft and a ring. It’s used to secure an eye to the structure. This method, the bolt may be fastened to any rope, shackle, or cable. The lifting eye is designed to assist the crane in connecting to the equipment. This is why lifting eyes designed for specific applications are necessary to provide a safe operating load.
Eye bolts with a low strength
Low-strength eye bolts are formed from a bar length with a threaded diameter (nominal). The ring begins in the unthreaded section of this bar. The eye bolts with low strength may readily support the axial loads. These kinds, however, should not be used for off-axis loads. The opening end may be welded, resulting in a break.
Eye Bolts with Extra Strength
High-strength eye bolts have forged rings and a shoulder (substantiated). Much of the off-axis stress is borne by the shoulder. This is critical in applications where several lifting eyes are linked to slings with multiple legs. As a result, high strength eye bolts can withstand greater loads than low strength eye bolts, and are therefore employed in lifting applications.
For applications such as lifting machines, the eye bolt may be inserted directly into the hole of the assigned structure. In this case, a fully threaded eye bolt with threads all the way to the shoulder is required. If a hole is used to insert the eye bolt and a nut is used to secure it, a shank may be quite useful. The shank is the section of the shaft that is not threaded and is located under the shoulder. It improves load transmission over the hole surface. This makes it more resistant to fracture in the event of an overload.
Types of eye bolts
Anchor eye bolts
These are eye bolts that have an anchor bolt to facilitate installation into stone objects.
Double Arming Bolt
Another simple but critical overhead power line hardware is a double arming bolt. It is primarily utilized to provide support during the building of the cross arm.
Pigtail bolt
A pigtail is constructed with a bar length. As a result, they are comparable to low-strength eye bolts. The head, is helix-shaped. This prevents it from bending and allows it to rotate 360 degrees. This permits a rope to be completely threaded through a structure using screws.
Ring eye bolts
In this sort of eye bolt, which goes through the head eye, a captive ring is used. This results in the formation of two chained linkages. This helps in the dispersion of the force generated by the eye bolts.
Roller bolt
These bolts are used to guide a cable or rope so that it passes smoothly and without unnecessary frictional effort. The head is essentially a four-roller assembly. These are used to hold the rope in place while it is being threaded through the bolt.
Screw eye bolts
Also referred to as eye screws, they are comparable to standard eye bolts. A wood screw, on the other hand, may be used in lieu of a machine screw. This screw is used to secure the eye to an object. Smaller versions are used to hang picture frames and other small items.
Square Head Machine Bolt
This is a pole line hardware for connecting or fastening the U channel or steel cross arm to the pole.
On an overhead transmission line or even a communication line, a square head machine bolt may be utilized.
Thimble Eye Bolt
Thimble Eye Bolts are used to attach dead end guy grips to poles. Additionally, it may be utilized to secure the guy wires to the concrete line.
Materials for the eye bolt
Eye bolts are manufactured from a number of materials, the most common of which being alloy steel, stainless steel, and carbon.
Rust-resistant stainless steel eye bolts ,This is made feasible by the presence of chromium, iron, manganese, nickel, molybdenum, silicon, and a trace of carbon in the core material.
As a result, steel eye bolts perform better in maritime situations. Additionally, the structure’s elegant look is ideal for architectural applications and detailing. It is also ideal for usage in the food and pharmaceutical sectors due to its overall lack of flaking and peeling.
Alloy steel eye bolts are suited for cold temperature applications. Lifting buildings below the freezing point of ice requires the use of an alloy steel eye bolt. Alloy steels have unique metallurgical qualities that allow for the preservation of a cold environment while maintaining structural integrity.
Galvanized steel eye bolts are created by passing molten zinc through a standard carbon via a hot dipping process, which results in an additional layer of corrosion protection. As a result, galvanized eye bolts are ideal for all outside applications due to their increased resistance to corroding factors. And since galvanized steel eye bolts are much less expensive than stainless steel eye bolts, they are commonly employed in the power system.
Marking of Eye Bolts
Eye bolts are critical components of the whole workplace safety chain. It is critical to carefully observe and analyze the bolt’s specs in this respect. The ring’s shank diameter is stamped or forged. This indicates the bolt’s total size. Additional specs and markers include the following:
Marking the eye bolt with a forge code enables the eye bolt to be traced back to the raw material.
- Diameter of the inner eye
- Diameter of the outside eye
- Overall length and weight
The eye bolt’s rated capacity is really the capacity of the eye bolt to raise the load when the weight is relocated to the eye bolt’s shank.
Angular lifting
As previously stated, several kinds and sizes of eye bolts are available on the market. The real purpose for this is to secure the various loads that will be hoisted.
The Critical Role of Rated Capacity
As previously stated, the rated working load, or rated capacity, is the maximum load that the eye bolt may safely support while lifting goods. The larger the eye bolt’s rated capacity, the more useful the eye bolt is in that regard.
When the load is placed in either of two places, a standardized lift is provided through the eye bolt shank. These positions include vertical and perpendicular. The list type utilized in this case is a zero degree list.
When lifting begins at a different angle, the eye bolt’s rated load is reduced. The greater the angle, the less capacity is assessed.
Applications of the eye bolt
The industry utilizes a variety of weight-bearing eye bolts. Among them are eye bolts with increased tensile strength and load capability. These are utilized for a variety of purposes, including tension generation and lifting.
Professionals also utilize specialized eye bolts in business situations. They use it to raise weights at a certain angle. These include eye bolts, which are machine screw threaded.
Professionals apply welded and stainless steel eye bolts under adverse weather situations. They are suitable for heavy-duty applications. They may use it both inside and outdoors in humid climates.
Professionals, on the other hand, may utilize galvanized eye bolts if the weather or working conditions are different. These are resistant to adverse environments, which means they have a greater potential to do a variety of tasks in the field.
Numerous various varieties of eye bolts have their own unique applications, benefits, and characteristics. As a result, it is essential that we pick the appropriate sort of eye bolt to ensure that our task is completed properly. Stainless steel eye bolts often last longer and are more dependable in outdoor situations than other bolts. Professionals, in particular, employ this sort of eye bolt in locations near the sea, where the air is salty.
After discussing the fundamental kinds and purposes of eye bolts, let’s look at the production process.
The manufacturing process of eye bolt components
Before delving into the procedure in depth, let us review the eye bolt manufacturing process in summary:
1.Wire: the wire is uncoiled and straightened. It is trimmed to the desired length.
2.Cold forging: the steel is shaped to the desired dimensions at a controlled temperature.
3.Bolt head: the bolt head is formed when steel is pushed through various colors. They are subjected to extreme pressure.
4.Thread formation: via cutting and rolling, threads are generated.
5.Heat treating: the steel is subjected to a very high temperature, which hardens it.
6.Surface treatment: zinc plating, depending on the application, boosts corrosion resistance.
Packing and stocking: this step occurs after quality control to ensure consistency and uniformity. Following this, the suppliers package the finished items for delivery.
Cold forging
The procedure begins with the use of big steel wire rods. They are cut to length and the steel is graded according to industry standards. It adheres to the ISO 898 clause’s rules. Professionals use a specific instrument to cold forge the wire. This technique shapes it properly. This is the area where the steel is shaped. The wire is subjected to extreme pressure as it passes through a succession of dyes.
Tolling is not an easy operation. At least two hundred distinct components have a high tolerance of less than a tenth of a millimeter. Once the procedure is complete, cold forging is capable of rapidly producing the items. The items are manufactured in large quantities and are all consistent in appearance. Cold forging begins with the uncoiling and cutting of massive steel wire rods. Steel grades are standardized throughout the industry in accordance with ISO 8981 criteria.
Drilling and turning
Complex bolt designs may need many operations. For instance, there is a procedure known as turning. Drilling is another method. The bolt is spun at a high speed during the turning process. The steel is removed to get the desired size and appearance of the eye bolt. Drilling, on the other hand, creates holes in the product. Certain bolts may need washers that attach throughout the procedure.
Heat treatment
Heat treatment is a standardized process that necessitates the use of bolts. It entails subjecting the bolt to very high temperatures, which hardens the steel. Threading is applied before to heat treatment by cutting or rolling. This occurs when the steel is still soft. It is similar to cold forging in that it utilizes a die to shape and form the material into threads. Following that, the cutting process occurs by removing steel.
Heat treatment is a simple approach since it alters the material’s properties, hence hardening the steel. Thus, the threading process becomes more easy and cost efficient. On application of the heat treatment to the thread, the fatigue performance will improve.
Straightening
Some eye bolts may also need straightening. It is preferable for eye bolts with a length greater than their whole diameter. The heating procedure alone may reshape the bolt.
Treatment of the surface
The surface treatment is determined by the bolt’s application and the client’s requirements. The primary consideration is corrosion resistance. Thus, the eye bolt is immersed in the galvanizing solution to coat it. It protects the product from severe environments. This method is carried out by professionals who utilize a zinc solution that is then exposed to an electric current. Zinc crystallizes into a layer. Following the procedure, the product is inspected for quality control before being packaged and distributed.
