High quality high tensile galvanized rail fish bolt
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Fishtail Bolts (Fish Bolts) are mostly used in rail joints (Railway Fishplates) for fixing purposes. Sometimes, hexagon bolts can be used instead.
Fishtail bolts are mainly used in track laying in the metallurgical industry, coking industry, and steel industry, where the rail and rail joints are fastened.
Fishtail bolt is a mechanical part, a cylindrical threaded fastener with a nut. Bolt: A fastener consisting of a head and a screw (cylinder with external thread). It needs to be matched with a nut to connect the two parts with the through hole. Bolt connection is this type of bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.
Type and material of fishtail bolt
Models are Φ14×70, Φ16×75, Φ18×90, Φ20×90, Φ22×135, Φ24×135, Φ24×145, Φ24×170, etc. They are usually formed by hot pressing with a friction press, with a buckle length of 50mm, and cold The upsetting is mostly used in the connection of rail joints.
Fishtail bolts are made of: Q235 and 45# steel and insulated fishtail bolts.
| Railway Fish bolt | ||||
| Grade | 4.6 | 5.6 | 8.8 | 10.9 |
| Material | Q235 | 35# | 45# | 40Cr |
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Mechanical
properties
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Tensile strength: ≥400Mpa | Tensile strength: ≥500Mpa | Tensile strength:≥800Mpa | Tensile strength: ≥1000Mpa |
| Yield strength:≥240Mpa | Yield strength:≥300Mpa | Yield strength:≥640Mpa | Yield strength:≥900Mpa | |
| Elongation:≥22% | Elongation:≥20% | Elongation:≥12% | Elongation:≥9% | |
|
Cold bending:
90 degree without crac
|
Cold bending:
90 degree without crac
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Cold bending:
90 degree without crac
|
Cold bending:
90 degree without crac
|
|
| Surface | plain (oiled), Oxide black, Zinc, HDG, wax, bitumen, Dacromet, Sherardizing | |||
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Standard
refers
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UIC864-2 | |||
What should be paid attention to when installing fishtail bolts on railway fishplates?
1. The contact part and bolts of fish plate and rail should be oiled. 2. When wearing fishtail bolts, the nuts must be staggered inside and outside. 3. The procedure for bolting, such as using a four-hole fishplate, first tighten the middle two, then tighten the two sides, and then tighten the middle two again. 4. When screwing the fishtail bolts, one person should use a 55 cm screw wrench as the standard, and not too long a screw wrench or two persons. 5. When the fishtail bolt cannot be put on, use a hammer to hit both ends of the fishtail plate, align the eyes, and do not use a hammer to drive the fishtail bolt in.
Fishtail bolt grade meaning
According to relevant standards, the performance grades of fishtail bolts are divided into more than 10 grades, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, and 12.9. The bolts of grade 8.8 and above are made of low carbon alloy steel or medium carbon steel. After heat treatment (quenching and tempering), they are generally called high-strength bolts, and the rest are generally called ordinary bolts. The bolt performance grade label consists of two numbers, which represent the nominal tensile strength value and yield ratio of the bolt material.
Fishtail bolt inspection:
Bolt inspection is divided into manual and machine. Manual is the most primitive and most commonly used consistent detection method. In order to minimize the outflow of defective products, the general production company personnel inspect the packaged or shipped products by visual inspection to eliminate defective products (defects include tooth injuries, mixing, rust, etc.). The other method is automatic machine inspection, mainly magnetic particle inspection. Magnetic particle inspection uses the interaction between the leakage magnetic field at the bolt defect and the magnetic powder to deal with the difference between the magnetic permeability of the bolts (such as cracks, slag inclusions, mixing, etc.) and the magnetic permeability of steel. These materials are discontinuous after magnetization. The magnetic field will be turbulent, forming part of the magnetic flux leakage, and the leakage magnetic field will be generated on the surface of the workpiece, thereby attracting the accumulation of magnetic powder at the defect where the magnetic powder is formed-the magnetic mark. Under proper lighting conditions, the defect position and shape will appear. The accumulation of these magnetic powders is observed and explained, and the purpose of rejecting defective products has been achieved.
Maanshan Ruika Metal Products Technology Co., Ltd. established by experienced crew on the rail&track field, is a professional & reliable supplier that provides all kinds of rail & track accessories.
As an international trade subsidiary of Maanshan Ruika Metal Products Technology Co., Ltd. as founded in 1997. We have more than two decades experience on this field, With advanced technology ,powerful processing capacity and excellent service, our products have been well recognized by our customers from domestic & overseas market.
If you have any questions, pls feel free to contact us as below:
Wechat: +86 15215554137
Web: http://www.kirail.com/
Email: kelly(@)kirail.com
| Industry Category | Transportation/Train-Parts |
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