High-strength railway enlarged, lengthened and thickened fish bolts with complete specifications for rail track clamping screws

Overview of Fish Bolts

Fish bolts (also known as rail joint bolts or fish wires) are key fasteners used to connect rails and fish plates (joint clamps) in track engineering. Its core function is to firmly connect the ends of adjacent rails through the cooperation of bolts and nuts to ensure the integrity and stability of the track system. This product is widely used in heavy-duty railway track laying in industries such as metallurgy, coking, and steel, as well as in urban rail transit, mining transportation, and other fields.

Features of Fish Bolts

Structural features

• Head design: Ordinary fish bolts use a square head with a semi-spherical top surface, the head of the 8.8-grade high-strength bolt has two additional ridges, and the head of the 10.9-grade bolt is in the shape of a flat cone.
• Neck design: The elliptical neck cooperates with the elliptical hole of the fish plate to prevent the bolt from rotating.
• Thread process: Spade thread or roller thread is used to ensure that the thread accuracy meets the GB196-81 standard.

Material features

• Ordinary type: Q235 steel, tensile strength ≥400MPa, suitable for non-permanent connections.
• High-strength type: 45# steel, 20 manganese titanium boron steel, 35CrMoA, etc., tensile strength ≥800MPa (8.8 grade) or 1000MPa (10.9 grade), suitable for permanent connections.

Manufacturing process

• Hot pressing: Hot pressing by friction press, buckle length 50mm, to ensure dimensional accuracy.
• Cold heading: Some products use cold heading process to improve surface quality and mechanical properties.

Specifications table of Fish Bolts

Performance of Fish Bolts

• Tight connection: external force is transmitted through bolt pre-tension and friction to ensure that the rail joint remains stable under train load.
• Anti-loosening design: used with spring washers to prevent bolts from loosening due to train vibration.
  Corrosion resistance: the surface can be treated with galvanizing, Dacromet, etc. to improve corrosion resistance and extend service life.
• Reusability: ordinary bolts can be disassembled and reused, and high-strength bolts are usually used for permanent connections.

Application of Fish Bolts

• Heavy-duty railway: Suitable for heavy-duty transportation tracks in the metallurgical, coking, and steel industries, bearing high-frequency, large-tonnage train loads.
• Urban rail transit: Rail joints in subway, light rail and other systems are tightened to ensure driving safety.
• Mining transportation: In the mine rail transportation system, it is used to connect rails and fishtail plates to adapt to harsh working conditions.
• Industrial rail: Internal rail transportation systems in factories, such as steel mills, coking plants, etc., meet high-strength connection requirements.
  

Package of Rail Transit Gearbox

Polybag+Carton box+Wooden case/Pallet, according to customer’s request

Company Profile

Luoyang Fenyo Heavy Industries Co., Ltd. was founded in 1998, covers an area of 72,600㎡, with more than 300 employees, 32 technicians, including 5 senior engineers, 11 assistant engineers, and 16 technicians. It has been rated as Luoyang Engineering Technology Center, Luoyang Technology R&D Center, and National High-tech Enterprise for many times.
Our production capacity is 30,000 tons per year. Currently, we mainly produce cast steel, cast iron (gray iron, ductile iron, etc.), processing of finished product and component assembly.the products have been exported to Russia, the United States, Germany, Argentina, Japan, France, South Africa,Italy and other countries.

FAQS

Q1: Are you a manufacturer or trading company?
A:Yes,our company was founded in 1998, with nearly 30 years in casting industry, a total area of 72,600㎡, with a factory building area of 51,000㎡.
Q2. What are your main products?
A: We primarily focus on steel casting, iron casting, finished product machining, and component assembly production.
Q3: How precision can you produce casting parts?
A: We have the capability of producing casting parts with different casting processes. The production is strictly comply with ISO 9001, ISO 14001 and ISO45001,EN15085, IRIS.
Q4. Can you produce according to the samples?
 Yes, we can produce by your samples or technical drawings. We can build drawings for you after we get your samples too.
Q5: How do you do Quality Control before delivery?
A: Quality inspection is a very important factor to guarantee the quality of steel casting parts. We follow 3 times of inspection during the whole production process. And we will provide material testing report, dimensional testing report, and mechanical properties testing report to our clients before delivery.

It you are interested in any products,please feel free to contact us.
Contact: Stella Liu
Email:sales@railwaypart.com
Mobile:+86-15515351287