Crystal Hardened & Ground Steel Straight Edge — AA-2901

A hardened steel straight edge is a precision tool used to check the flatness of surfaces, for setting up machinery, and for drawing or scribing straight lines. Its hardened edges resist wear and maintain accuracy over time.

The Crystal AA-290 series straight edges are hardened and tempered to approximately 60 HRC, ensuring high wear resistance and durability.

Yes, all Crystal measuring instruments are supplied with a manufacturer's calibration certificate. Traceable calibration certificates are available at an additional cost.

The Crystal AA-290 series straight edges are manufactured to meet or exceed the Indian Standard (IS) specifications for precision straight edges.

To maintain accuracy, clean the straight edge after each use, apply a light coating of rust-preventive oil, and store it in its protective case, preferably in a flat position.

Yes, we provide a GST invoice for all purchases. Please provide your GSTIN at the time of order.

Yes, we deliver to all locations across India. Shipping charges may vary depending on the location.

Crystal measuring instruments are covered by a 1-year manufacturer's warranty against any manufacturing defects.

The AA-290 series is available in the sizes listed on the product page. For custom sizes, please contact our sales team for a quote.

The accuracy of a straight edge can be verified by comparing it against a known flat surface (like a surface plate) or by using the line-interferometry method with an optical flat.

The 100mm AA-2901 is ideal for small-scale precision work, such as in tool and die making, or for inspecting small machined parts where a compact and easy-to-handle straight edge is required.

The 160mm AA-2902 is a versatile size for general workshop use, suitable for checking the flatness of smaller components, and for setting up benchtop machinery.

The 300mm AA-2903 is a popular choice for machine shops and fabrication units. It's well-suited for checking medium-sized workpieces and for aligning smaller machine tools.

The 500mm AA-2904 is recommended for medium to large machining applications, such as checking the beds of smaller lathes or milling machines, and for inspecting larger fabricated assemblies.

The 800mm AA-2905 is designed for heavy-duty applications, including the alignment of large machinery, checking the flatness of large plates, and in the construction of large industrial equipment.

The 1000mm AA-2906 is the largest in the series, intended for large-scale industrial use, such as aligning long machine beds, checking large surface tables, and in the assembly of large frames and structures.

The primary difference is the length, with the AA-2901 being the shortest at 100mm and the AA-2906 being the longest at 1000mm. The cross-sectional dimensions also increase with length to maintain rigidity and accuracy over the longer span.

The price of the straight edge increases with its length and cross-sectional size. This is due to the increased material cost, and the higher precision required for manufacturing and grinding longer straight edges to the required accuracy standards.

For a typical machine shop or workshop, the 300mm (AA-2903) or 500mm (AA-2904) models offer the best balance of versatility, handling, and cost, covering a wide range of common inspection and setup tasks.