Gnee railway anchor bolts are usually made of Q235 steel with good strength and precision. Anchor bolts tightly buckle the rails and the lower roadbed to form a stable and reliable overall structure to ensure the safe operation of trains. Gnee’s railway anchor bolts are strictly produced in accordance with international advanced standards, suitable for various track types and sections such as subways and high-speed railways, etc. and can provide high-quality products according to customer-specified standards or drawings to meet the needs of different railway projects.
Gnee provide different kinds of anchor bolts, such as L shaped bolts, J shaped bolts, U shaped bolts, T shaped bolts and straight type bolts, etc.
L – shaped Anchoring Bolt
Details
Description
Use
Suitable for the fixation of sleepers and roadbeds, commonly found in ordinary railways or turnout areas
Material
Q235 carbon steel/45# steel/stainless steel 304
Diameter Range
M16 – M30
Length Range
200mm – 500mm
Bending Angle
90° (L – shaped)
Tensile Strength
≥500MPa
Surface Treatment
Hot – dip galvanizing/Dacromet coating
J – shaped Anchoring Bolt
Details
Description
Use
Mostly used for track fixation in curved sections or complex terrains, with strong lateral force resistance
Material
40Cr alloy steel/stainless steel 316
Diameter Range
M20 – M36
Length Range
300mm – 600mm
Bending Arc
Semicircular (J – shaped hook head)
Tensile Strength
≥600MPa
Surface Treatment
Zinc infiltration/Epoxy resin spraying
U – shaped Anchoring Bolt
Details
Description
Use
Used for the two – way locking of steel rails and sleepers, commonly found in high – speed railways or heavy – haul railways
Material
35CrMo alloy steel
Diameter Range
M24 – M42
Opening Width
50mm – 120mm
Shear Strength
≥700MPa
Surface Treatment
Hot – sprayed zinc/Phosphating treatment
T – shaped Anchoring Bolt
Details
Description
Use
Suitable for embedded fixation in ballasted tracks or ballastless tracks
Material
Q345B low – alloy steel
Diameter Range
M18 – M32
Head Size
T – shaped head width 40mm – 80mm
Vibration Resistance Performance
Complies with TB/T 2344 standard
Surface Treatment
Electro – galvanizing/Fluorocarbon coating
Straight – rod Anchoring Bolt (Expansion Type)
Details
Description
Use
Used for the rapid anchoring of concrete sleepers or bridge tracks
Material
20MnTiB alloy steel
Diameter Range
M12 – M24
Length Range
150mm – 400mm
Expansion Sleeve Material
Nylon/Stainless steel
Installation Torque
100N·m – 300N·m
Product Description
Railway anchor bolts are a very important fastener in track parts. The function of spring clip buckling rails can only be realized through anchor bolts. Once the bolts fail, it will affect the integrity and stability of the track structure and the safety of train operation.
Gnee adopts advanced heat treatment technology to provide a full range of standard specifications of anchor bolts. At the same time, according to the railway construction needs of different countries and regions, it can quickly respond to and customize special specifications of products to meet the personalized requirements of various complex railway projects. It can remain stable in harsh railway environments such as extreme cold, high temperature, and strong corrosion, ensuring the safe operation of railway facilities.
In addition to anchor bolts, Gnee also provides a full range of railway fastening systems and fasteners. The bolt series includes T-bolts, turnout bolts, fish bolts, tunnel bolts, etc., as well as matching nuts.
Mechanical Performance Parameters Of Railway Anchor Bolts
Performance Parameter
Common Carbon Steel Material
High-Strength Alloy Steel Material
Tensile Strength
About 400MPa – 600MPa
800MPa – 1200MPa or even higher
Yield Strength
200MPa – 300MPa
400MPa – 600MPa
Shear Strength
Approximately 0.5 – 0.6 times the tensile strength
Approximately 0.5 – 0.6 times the tensile strength
Fatigue Strength
The strength index that the bolt can withstand the maximum stress without fatigue failure under alternating loads. The specific value varies depending on materials, processes, and load conditions
The strength index that the bolt can withstand the maximum stress without fatigue failure under alternating loads. The specific value varies depending on materials, processes, and load conditions
It needs to be selected according to the track type (high-speed rail, heavy load, ordinary), environment (humidity/salt spray/high temperature) and force requirements (tensile/shear resistance). For example, stainless steel is recommended for coastal areas, and U-type or J-type bolts are recommended for heavy-load railways.
What are the anti-corrosion treatments for bolts? Which one is more suitable for long-term outdoor use?
Common anti-corrosion methods include hot-dip galvanizing, Dacromet coating, and epoxy resin spraying. For long-term outdoor use, hot-dip galvanizing (thickness ≥80μm) or Dacromet (salt spray resistance for more than 1000 hours) is recommended.
What should be paid attention to when installing anchor bolts?
Make sure the hole is clean and free of debris;
Tighten according to the standard torque (refer to the product parameter table);
Expansion bolts need to check the concrete strength (≥C30);
Regularly check the looseness of the bolts (it is recommended to inspect every 6 months).
Do your bolts meet the railway industry standards?
Yes, the products strictly follow TB/T 3275 (China Railway Standard) and ASTM F1554 (International Standard), and provide third-party test reports.
Can special sizes or materials be customized?
Customization is supported. Non-standard sizes (such as extension rods, special-shaped heads), special materials (such as weathering steel, duplex stainless steel) and surface treatment solutions are provided. The delivery cycle is about 15-30 days.
What are the common causes of bolt failure?
The main reasons include:
Insufficient or excessive installation torque;
Thread wear caused by environmental corrosion;
Fatigue fracture caused by rail vibration;
Material does not meet the standard (such as insufficient tensile strength).
How to determine whether the bolt needs to be replaced?
If the following conditions are found, it needs to be replaced immediately:
Thread damage exceeds 30%;
Surface rust depth ≥ 0.1mm;
Cracks or deformation appear on the bolt head.
Why Choose Gnee Rail Fasteners?
As a world-leading manufacturer of rail fastener systems, Gnee Rail Fasteners has 18 years of professional experience, an annual production capacity of 10 million sets, and its products are exported to more than 60 countries. We have built 5 production bases, equipped with 400 technicians, and annual R&D investment exceeds 5% of revenue.
Our products have been used in more than 2,000 railway projects, with a total of 50,000 kilometers of track laid, covering more than 100 high-speed rail projects. From -40℃ to 80℃, the product performance remains stable and reliable. With strict quality control and professional technical support, more than 85% of our customers maintain long-term cooperation with us, and customer satisfaction continues to remain above 93 points.
