The A75 Profile per DIN 536
The A75 crane rail is a heavy-duty flat-bottomed rail defined by the European standard DIN 536-1:1991. Its dimensions are engineered to provide a low center of gravity and a broad support base for the massive vertical and horizontal wheel loads generated by heavy crane systems. The profile is one of the most widely used in the DIN 536 A-series, sitting between the A65 and the A100.
Full Dimension Table
| Parameter | Value |
|---|---|
| Head width | 75 mm |
| Base width | 200 mm |
| Rail height | 85 mm |
| Web thickness | 45 mm |
| Section area | 71.60 square centimeters |
| Nominal mass | 56.2 kg per meter |
| Standard length | 12 meters |
These values follow the official DIN 536 P1:1991 section data, which lists the A75 with a height of 85 mm, a base of 200 mm, a head of 75 mm, a web of 45 mm, a section area of 71.60 square centimeters, and a mass of 56.20 kg per meter.
What Each Dimension Does
The 75 mm head is the contact surface for the crane wheel. Its width matches standard crane wheel treads and provides enough wear volume for a long grinding cycle. The 200 mm base is the stability element. It is wider than the 85 mm height of the rail, which gives the profile a very low height-to-width ratio and strong resistance to overturning moments.
The 45 mm web connects the head and base. Its thickness prevents web buckling under vertical load and adds rigidity to the whole section. The low total height of 85 mm keeps the center of gravity close to the runway beam, minimizing the lever arm that lateral crane forces can act on.
Structural Advantages
Because of its proportions, the A75 distributes the load of 50 to 100 ton cranes over a large support area. The wide base reduces the bearing pressure on sole plates and the supporting beam, which protects the foundation from fatigue damage. The profile is usually rolled from U71Mn steel with a minimum tensile strength of 880 N per square millimeter, and higher hardness grades are available for continuous high-frequency operation.
The standardized DIN 536 geometry also means that clips, rubber pads, and fishplates for the A75 are available worldwide, which simplifies procurement and replacement for international projects.
Applications
The A75 is the industry benchmark for versatility in crane rail. It is used for material yards, stacking cranes, ship unloaders, semi-gantry cranes, and double-girder overhead cranes in mines and heavy production facilities. The rail supports both bolted fishplate joints and aluminothermic welding, so it can be installed as either a jointed or a continuous runway.
FAQ
Q: What is the head width of the A75 rail?A: The head width is exactly 75 mm, which is the identifying dimension of the A75 profile within the DIN 536 A-series and matches standard crane wheel widths.
Q: How much does one meter of A75 rail weigh?A: The nominal weight is 56.2 kg per meter, per the DIN 536 section data.
Q: What is the difference between A75 and A100 rail?A: The A75 has a 75 mm head and a 200 mm base, while the A100 has a 100 mm head and the same 200 mm base. The A75 is better suited to medium-duty crane systems.
Q: What material grades are available for A75 crane rail?A: The A75 is available in tensile grades of 690, 880, and 1080 N per square millimeter, and the choice depends on the operating frequency and the crane wheel loads.
Q: Are specialized clips required for A75 installation?A: Yes. Clips must match the A75 profile and the 200 mm base width so that the rail stays secure and correctly aligned during operation.
Q: Can the A75 rail be supplied in custom lengths?A: Yes. While 12 meters is standard, custom lengths and end processing are available to match specific runway layouts and shipping limits.
