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Precision Squares
The DIN 875 precision squares are essential measuring and inspection tools used mainly in metallurgy, precision component manufacturing, and machining industries. They are made of high-quality steel and feature a 90° angle, ensuring high accuracy when checking perpendicular surfaces and aligning mechanical components.
These squares are available in various types, such as:
- Flat squares (Type A): Without additional elements, simple and accurate.
- Squares with stock (Type B): With a reinforced side (stock) for greater stability.
- Squares with beveled edges (Type C): With specially formed edges for specific applications.
Their accuracy is defined by the DIN 875 standard, which specifies strict tolerances for angle, flatness, and straightness, depending on the accuracy class (00, 0, 1, 2). These classes allow selection of the appropriate square according to the requirements of each application.
DIN 875 precision squares are ideal for use in:
- Checking and aligning components during assembly.
- Inspection of machine tools.
- Setups and quality inspections.
- High-precision measurements in tool and mold making.
The option to issue factory calibration certificates ensures traceability and reliability, making them suitable for use in environments where certification based on international quality standards is required.
📏 Square Tolerance Table (DIN 875)
| Leg Length (L) | Class 00 (High Accuracy) | Class 0 (Good Accuracy) | Class 1 (Normal Accuracy) | Class 2 (Lower Accuracy) |
|---|---|---|---|---|
| 50 mm | 3 μm | 7 μm | 14 μm | 28 μm |
| 75 mm | 3 μm | 7 μm | 15 μm | 30 μm |
| 100 mm | 3 μm | 7 μm | 15 μm | 30 μm |
| 150 mm | 4 μm | 8 μm | 18 μm | 35 μm |
| 200 mm | 4 μm | 9 μm | 20 μm | 40 μm |
| 250 mm | 5 μm | 10 μm | 23 μm | 45 μm |
| 300 mm | 5 μm | 11 μm | 25 μm | 50 μm |
| 400 mm | - | 13 μm | 30 μm | 60 μm |
| 500 mm | - | 15 μm | 35 μm | 70 μm |
| 600 mm | - | 17 μm | 40 μm | 80 μm |
| 750 mm | - | 20 μm | 43 μm | 85 μm |
| 1000 mm | - | 25 μm | 60 μm | 120 μm |
| 1500 mm | - | 35 μm | 85 μm | 170 μm |
📐 Flatness / Straightness Tolerances
| Class | Calculation Type (μm) |
|---|---|
| 00 (High Accuracy) | (2 + L/250) |
| 0 (Good Accuracy) | (2 + L/100) |
| 1 (Normal Accuracy) | (4 + L/50) |
| 2 (Lower Accuracy) | (8 + L/25) |
🛠️ Notes
- L = the length of the side (L1 or L2).
- The values are in μm (micrometers).
- The lower the class, the greater the tolerance.
- These values apply to flat squares as well as squares with stock or beveled edges.
