How to choose fish bolt?

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Mar 11,

The fish bolt is a rail fastener that is used with rail joint. There are various types of fish bolt on the railway material market, the customers can select suitable and applicable fish bolt to buy. But for a part of new buyers, they don&#;t know how to choose fish bolt. As a professional railway fastener manufacturer, AGICO Rail compare common fish bolt and high-strength insulating bolt to help you to know the fish bolt better and choose fish bolt easily.

The material of fish bolt is low carbon alloy steel or medium carbon steel and after heat treatment (quenching, tempering), known as high strength fish bolt. The rest are called common fish bolts. High-strength fish bolts are made of high-strength steel or require large pre-tightening force.

High-strength insulating bolt is used to fasten steel rails. It is a kind of rail fastener such as rail clip, track spike, screw spike, tie plate, rail joint bar, etc. High strength fishtail bolts have several grades such as 8.8, 9.8, 10.9 and 12.9.High strength fish bolts are mostly used for the connection of bridge or steel rail.

High-strength insulating bolt and fish bolt are two common types of rail bolt. They are both used to fix steel rails, and what&#;s the difference between high-strength insulating bolt and fish bolt?

Comparison of high-strength insulating bolt and fish bolt

High strength fish bolts are designed to withstand loads greater than normal bolts of the same specification. The ordinary fish bolts are made of Q235 (A3). In order to distinguish high-strength fish bolts and ordinary fish bolts, and we will compare and analyze the differences between them through multiple aspects.

• From the view of material, the high strength fish bolt uses the high strength material to manufacture. Bolts, nuts and washers are made of high strength steel, such as 45 steel, 40 boron steel, and 20 manganese titanium boron steel, 35CrMoA. Ordinary bolts are usually made of Q235 steel.
• From the view of strength grade, the high strength fish bolt has been widely used. Two common intensity grades include 8.8s and 10.9s , of which 10.9 is the most common. The strength of ordinary fishtail bolts is much lower in grades 4.8, 6.8 and 6.8. 
• According to the characteristics of the force, the high strength fish bolts apply pretension and transmit external force by friction. The normal fish bolt is connected by the shear resistance of the bolt rod and the pressure of the hole wall to transfer the shear force. The pretension produced when tightening the nut is very small and its influence can be ignored.
• From the view of use of fish bolt, common fish bolts can be reused, but high-strength fish bolts cannot be reused. High strength bolts are generally used for permanent connections. The high strength fish bolt is the pre-stressed bolt, the friction type torque wrench applies the specified prestressing force, the pressure type twists off the plum head. The common fish bolt has poor shear resistance and can be used in the secondary structure. Ordinary fish bolts only need to be tightened.

In conclusion, high-strength fish bolt connection has the advantages of simple construction, good mechanical performance, removable, fatigue resistance, and not loose under the action of dynamic load, in a word, itis a very promising connection method. The high strength fish bolt uses the specially-made wrench to tighten the nut, the bolt produce the huge but the controlled pre-tension, through the nut and the pad, also apply same pre-pressure to the connected piece.

Do you have a full guide of fish bolt? We hope you can know more about high-strength fish bolt and understand the difference between high strength insulation bolts and ordinary fish bolts.     

Railway fishplate, also called rail joint or joint bar, it is a typical type of rail components in the railway track system. Rail bolt is a railway fastener that works with railway fishplate together.

Rail fishplate

Rail fishplate, which is bolted to the ends of two railroad tracks to join them together, is widely used in light rail, heavy rail and crane rail. So if the quality of the railway fish plate is poor, the caused consequence would be unimaginable. As to the fastening system, fish bolt is the other important part and always firstly chosen in the part of fastening. In general, the rail fastening system is consisting of fish bolt, flat washer and spring washer. Every two fishplates mostly need four or six suits of fish bolt.

If you want to learn more, please visit our website Rail Fish Bolt.

Types of rail fishplate

Rail fishplate is widely use in the transportation of light rail, heavy rail and crane rail.

• Light rail: 8kg, 9kg, 12kg, 15kg, 18kg, 22kg, 24kg and 30kg
• Heavy rail: 38kg, 43kg, 50kg and 60kg
• Crane rail: QU70, QU80, QU100 and QU120

Besides, there are so many various oversea railway fishplates: BS80A, BS80A, BS75R, UIC60 and UIC54 and UIC series, e.g.

Features of fishplate include:

• Convenient to install and handle
• Rust-resistant

To meet the different requirements, the joggled fish plate is usually used in recent days. It has a simple structure and can largely reduce the impact of wheels to the connecting sections of the rail tracks and increase the continuity and steadiness of the train when passing through the connecting sections.

Features of joggled fishplate include:

• Good toughness
• Difficult to get rusty
• High level design

Rail bolt

Rail bolt is another important component of railway fastening system. It is always used in the ends of two rail tracks to connect them together with the rail fish plate. With an oval neck, the rail bolt can be prevented from turning when torqued. After heat-treated, the track bolt will be stretch a little, then they should be tightened after initial application. And in general, the rail bolt is used with square nuts and spring washer. The size of rail bolt varies from the different international standards of rail tracks and the common types are Diamond neck track bolt, Track bolt of Russian standard, Button head oval neck track bolt, Fish bolt, Rail bolt NF F50-008, Clip bolt, anchor bolt, T-bolt clamp, Clamp bolt and inserted bolt for Russia and other special bolts such as Frog rail bolts and so on.

Typical rail bots include:

• Button head oval neck track bolt
• Diamond neck track bolt
• Rail bolt NF F50-008
• Clip bolt with BSW thread
• Fish bolt used for rail joints (with rail nuts and spring washers)
• Clip bolt HS26 & HS32
• Clamp bolt and inserted bolt for Russia
• Anchor bolt
• T-bolt
• Special bolt
• Tunnel bolt

Frog rail bolts

The most obvious sign of Frog bolt is the square headed. And it also has a variety of lengths and diameters which are depended on the rail section in use and the location of the bolt in the frog.

Features of frog rail bolts:

• Good dimensional accuracy and stability
• Good batch traceability
• High quality and workmanship
• Reliable

During the process of connecting the rail tracks, both the rail fishplate and rail bolt make up the connection. They all have an important effect on the transportation of railway. So if the quality of the railway fish plate or rail bolt is poor, the caused consequence would be unimaginable. In order to prevent the unsafe factors, we should take a few basic precautions and inspection in the life.

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