Crystal Hardened & Ground Knife Edge Tri Square — AA-4201

A knife edge try square is a precision woodworking or metalworking tool used to check and mark 90-degree angles with very high accuracy. The knife edge allows for extremely precise line marking and checking for squareness in corners.

Hardening the steel makes the tool resistant to wear and damage, ensuring it maintains its accuracy over a long period of use. Grinding creates a perfectly flat and smooth surface, which is essential for accurate measurements.

It is crafted from a single piece of fully seasoned, high-quality tool steel, hardened and ground for maximum durability and precision.

Yes, it is designed for high precision. The blades are accurately lapped, and the right angles are precise both inside and outside, making it suitable for industrial machining and quality control applications.

Absolutely. We provide a GST invoice for all purchases, allowing you to claim input tax credit for your business.

Yes, we offer pan-India delivery, ensuring your order reaches you no matter where your workshop or business is located.

Crystal tools come with a standard manufacturer's warranty against any manufacturing defects. For specific warranty details and claims, please contact our customer support team.

To maintain accuracy, keep the tool clean and dry. Avoid dropping it or using it as a striking tool. Store it in its protective case when not in use to protect the knife edge.

Yes, the robust, hardened steel construction and high precision make the Crystal AA-420 series ideal for heavy-duty use in professional machine shops, fabrication units, and quality control departments.

The 50x35mm model is perfect for small-scale, high-precision tasks such as model making, jewelry, or checking the squareness of small machined parts where a larger square would be cumbersome.

This compact 75x50mm size is ideal for general-purpose bench work, tool and die making, and for machinists who need a reliable, easy-to-handle square for smaller workpieces.

The 100x70mm variant is a versatile, all-around size suitable for most common workshop tasks, including layout work and inspection of medium-sized components.

This 150x100mm (6-inch) model is a popular choice for cabinet makers, fabricators, and engineers who require a larger reference edge for setting up machinery and checking assemblies.

The 200x140mm size offers a longer reference surface, making it well-suited for larger layout tasks, sheet metal fabrication, and ensuring squareness on bigger assemblies and machine setups.

Ideal for large-scale fabrication and machine setup, the 250x165mm model provides the accuracy needed for checking large frames, jigs, and fixtures where precision over a longer distance is critical.

The 300x200mm (12-inch) try square is designed for heavy-duty industrial applications, such as aligning large machinery, checking the squareness of large weldments, and other large-format fabrication tasks.

As the largest model in the series, the 400x250mm try square is essential for professionals working on very large projects, such as structural steel fabrication, large machine assembly, and gantry alignment, where maximum reference length is required.

The primary difference is their size. The series ranges from a small 50x35mm square for intricate work to a large 400x250mm version for heavy industrial applications. All variants share the same high-quality hardened and ground steel construction.

Consider the typical size of the workpieces you handle. For small parts and bench work, a smaller square (50-100mm) is sufficient. For machinery setup, fabrication, and larger assemblies, choose a larger square (150-400mm) that provides an adequate reference length.

Yes, all try squares in the Crystal AA-420 series are manufactured to the same high standards of accuracy. The choice of size relates to the scale of the work, not the level of precision required.