Granite Tri-Squares are used for verticality inspection of machine tools, mechanical equipment, and components, as well as alignment during installation and machining, marking, and more. They serve as a critical measurement tool in the mechanical industry.
Features:
- High precision
- Exceptional stability
- Easy maintenance
TYPE(mm) Squareness beteween abjacent measuring surfaces Straightness of measuring surface Parallelism between opposite measuring surface Precision Grade 00 0 00 0 00 0 150*150 1.8 3.5 0.8 1.6 1.8 3.5 160×160 2 4 0.8 1.7 2 4 200×200 2 4 0.9 1.8 2 4 250×250 2.2 4.5 1 2 2.2 4.5 315×315 2.6 5.2 1.1 2.3 2.6 5.5 400×400 3 6 1.3 2.6 3 6 500×500 3.5 7 1.5 3 3.5 7 - Since the entire production process of granite square ruler—from material selection, manufacturing to final inspection—must be completed in a constant temperature room, external temperature and humidity fluctuations after removal from this controlled environment may affect the cube’s accuracy. Additionally, handling vibrations during transportation and road-induced shocks can cause minor deviations in precision.To ensure optimal accuracy, it is recommended to acclimate the cube in a constant temperature environment for 24 hours before initial use to eliminate environmental stress effects.We also implement rigorous measures to minimize transportation impacts on precision:
- Packaging: Multi-layer plywood crates with internal protective films and buffer isolation boards.
- Damage Resistance: Reinforced structural design to withstand standard transportation vibrations.
- Accuracy Assurance: Transport-induced deviations typically ≤0.5μm, ensuring no impact on normal usage.
These precision granite cubes are now widely used for flatness and perpendicularity inspection in equipment, offering the following advantages:
- Environmental Adaptability: Excellent resistance to acids, alkalis, and high temperatures (operating range: -20℃ to 50℃).
- Long-Term Stability: Annual natural deformation <0.8μm/m.
- Versatility: Suitable for machine tool calibration, CMM (Coordinate Measuring Machine) benchmarks, precision assembly, and more.