A120 rail is the heaviest profile in the DIN 536 A-series family. Its 120 mm head width and reference mass of approximately 100 kg/m place it at the top of the series, making it the go-to choice for high-capacity overhead cranes, heavy gantry systems, and demanding industrial runways. Because the rail carries extreme dynamic loads, choosing the correct a120 rail clips is not optional, an undersized or mismatched clamp leads to rail creep, fatigue cracking in the beam flange, and unplanned downtime. Only fasteners dimensioned specifically for the 120 mm head and ≈170 mm base will deliver safe, long-term performance.
A120 Rail Specifications at a Glance
Before selecting any clip or clamp, verify the key section data against your project drawings. The table below lists the principal A120 dimensions per DIN 536.
Use the rail weight calculator to cross-check the kg/m figure for A120 and adjacent profiles.
| Parameter | A120 Value |
|---|---|
| Head width | 120 mm |
| Rail height | ≈ 170 mm |
| Base width | ≈ 170 mm |
| Web thickness | ≈ 26 mm |
| Mass | ≈ 100 kg/m |
| Standard | DIN 536 |
For full DIN rail dimensions across the A-series, refer to the dedicated dimensions page. Note that all values should be confirmed against the current edition of DIN 536 or the mill certificate supplied with your rail order, as rolling tolerances can affect as-delivered geometry.
Technical Spec Comparison, A120 vs Adjacent Crane Rails
Selecting the right fastener requires knowing how A120 compares to neighboring profiles. Head width and base width directly determine which clip jaw opening and clamping range apply.
| Profile | Standard | Head (mm) | Height (mm) | Base (mm) | Mass (kg/m) |
|---|---|---|---|---|---|
| A120 | DIN 536 | 120 | ≈170 | ≈170 | ≈100 |
| A100 | DIN 536 | 100 | ≈150 | ≈150 | ≈74 |
| A75 | DIN 536 | 75 | ≈120 | ≈120 | ≈44 |
| CR120 | GB/T 11264 | 120 | ≈130 | ≈127 | ≈89 |
| 115RE | AREMA | 114 | ≈152 | ≈140 | ≈57 |
Key takeaway: A120 and CR120 share the same nominal head width but originate from different national standards with different height and base profiles, their fasteners are not interchangeable. Similarly, A100 rail dimensions reveal a significantly narrower section, so A100 clips must never be substituted on A120 rail. Use the clip selector to confirm compatibility.
Rail Clip and Clamp Options for A120 Rail
Three fastener families cover most A120 installations. Each suits a different structural situation, load level, and maintenance philosophy.
1. Heavy-Duty Forged Fastening Clamps The most common choice for A120. A forged fastening clamp is machined from a single forged steel blank, giving it high fatigue resistance under cyclic crane loading. The wide jaw opening accommodates the 120 mm head plus any rubber railway pads placed beneath the rail. These clamps bolt directly to the beam flange and allow a controlled amount of lateral float.
2. Self-Locking Crane Rail Clips Self-locking crane rail clips use an eccentric locking mechanism that tightens under load. They are faster to install than traditional bolt-down clamps and do not require torque retightening during service, which reduces maintenance cost on long runway systems.
3. Adjustable Crane Rail Clamps Where runway alignment must be fine-tuned after installation, for example, in shipyard berths where settlement is expected, adjustable crane rail clamps provide lateral positioning flexibility while still gripping the 120 mm A120 head securely.
Application Scenarios
| Application | Typical Load | Recommended Clip Type |
|---|---|---|
| Port container crane | Very heavy | Forged fastening clamp |
| Steel mill ladle crane | Heavy + heat | Forged clamp + heat-resistant pad |
| Shipyard gantry | Heavy, variable | Adjustable clamp |
| Warehouse heavy crane | Medium–heavy | Self-locking clip |
In port and steel mill environments, the priority is maximum fatigue life under millions of load cycles, making the forged clamp the default recommendation for a120 rail clips in those settings. In shipyard or adjustable-runway applications, the ability to re-align the rail during its service life outweighs the marginal strength advantage of a fixed clamp.
Frequently Asked Questions
Q1: What is A120 rail?
— The heaviest DIN 536 A-series crane rail, with a 120 mm head width and a reference mass of about 100 kg/m.
Q2: Which rail clips fit A120 rail?
— Heavy-duty forged clamps and self-locking clips matched to the 120 mm head and ≈170 mm base are the principal options for a120 rail clips.
Q3: How much does A120 rail weigh per meter?
— Approximately 100 kg/m per DIN 536; confirm against the standard or factory drawings.
Q4: What is the difference between A120 and CR120 rail?
— They share a 120 mm head width but come from different standards (DIN 536 vs Chinese GB), so profiles and clips are not interchangeable.
Q5: Can A120 rail clips be used on A100 rail?
— No. The 120 mm and 100 mm head profiles differ, so each needs a clamp matched to its own section.
