The Nominal Weight of A120 Rail
The theoretical weight of the A120 crane rail is 100 kg per meter according to the DIN 536-1:1991 standard section data, which lists a section area of 127.40 square centimeters. This high mass is a direct result of the profile geometry: a 120 mm head, a 220 mm base, a 105 mm height, and a 72 mm web thickness.
Because the profile is so wide and thick, a 12-meter standard length weighs approximately 1.2 metric tons. This is an important figure for every calculation in the project, from girder design to transport planning.
Why the Weight Is Constant Across Grades
The physical weight of the A120 profile remains the same whether the rail is rolled in grade 700, 900A, or S1100. The mass comes from the volume of the cross section and the density of steel, which is almost identical across grades. Choosing a higher grade improves tensile strength and hardness, but it does not change the weight per meter.
The DIN 536 A-Series Weight Table
| Profile | Head mm | Base mm | Height mm | Web mm | Section cm² | Mass kg per meter |
|---|---|---|---|---|---|---|
| A45 | 45 | 125 | 55 | 24 | 28.20 | 22.10 |
| A55 | 55 | 150 | 65 | 31 | 40.50 | 31.80 |
| A65 | 65 | 175 | 75 | 38 | 54.90 | 43.10 |
| A75 | 75 | 200 | 85 | 45 | 71.60 | 56.20 |
| A100 | 100 | 200 | 95 | 60 | 94.70 | 74.30 |
| A120 | 120 | 220 | 105 | 72 | 127.40 | 100.00 |
| A150 | 150 | 220 | 150 | 80 | 191.40 | 150.30 |
How the Weight Drives Structural Design
Structural engineers use the 100 kg per meter figure to calculate the dead load of the track system. The supporting girders and sole plates must be rated for the rail weight plus the crane wheel loads and the lifted load. Because the A120 weighs over 100 kg per meter, it offers much higher stiffness than lighter profiles, which is essential for keeping the crane track level under the extreme wheel loads of gantry cranes.
Heavier rails also generate more significant thermal expansion forces. The fastening system must therefore be robust enough to hold the mass of the rail while allowing necessary longitudinal movement as the track temperature changes.
Shipping and Handling Considerations
For procurement planning, the mass determines the number of sections that can be loaded into a standard container before the weight limit is reached. A 12-meter A120 section weighs about 1.2 metric tons, so a 20-foot or 40-foot container reaches its payload quickly. Heavy lifting equipment is required at both the port and the installation site, and the cost of freight is a substantial part of the total procurement budget.
Frequently Asked Questions
Does the weight of A120 rail change with a higher steel grade? No. The nominal weight of 100 kg per meter comes from the profile volume and the standard density of steel, so a higher grade changes strength but not weight.
Why is the A120 so much heavier than a standard railway rail of similar height? The A120 is much wider, with a 220 mm base and a 120 mm head that add significant volume. This mass is necessary to handle the slow, heavy crushing forces of cranes rather than high-speed train traffic.
What is the weight of one 12-meter A120 rail? t 100 kg per meter, a standard 12-meter length weighs approximately 1.2 metric tons.
How does the rail weight affect the choice of rubber pads? The heavy profile requires high-density, steel-reinforced rubber pads strong enough to support the dead weight plus the active crane load without flattening permanently.
Can custom lengths help manage shipping weight? Yes. Custom lengths can match container payload limits and on-site lifting capacities, provided they stay within the DIN 536 dimensional requirements of the profile.
How is the theoretical weight verified on delivery? Mill test certificates and weighing records confirm the mass and dimensions of each batch against the DIN 536 standard before shipment.
