Crystal Hardened & Ground Knife Edge Straight Edge AA-2801
Crystal Hardened & Ground Knife Edge Straight Edges ensure accurate layout and inspection in metalworking environments per IS-3512-1966. The AA-2801 model features compact 50 X 30 X 8 mm dimensions suitable for small-scale machining. • Compact 50 X 30 X 8 mm size fits tight workspaces • Hardened steel construction resists wear during use • Knife edge allows accurate alignment on small parts
Specifications
For: AA-2801- Brand
- Crystal
- Accuracy
- as per IS-3512-1966
- Material
- High-quality tool steel
- Hardness
- 55 HRC ± 2 HRC
- Packaging
- Individual wooden box
- Series
- AA-280
- Size
- 50 X 30 X 8 mm
Configurations
Click a row to switch| Variant | Size | Series | Price |
|---|---|---|---|
| AA-2801 | 50 X 30 X 8 mm | AA-280 | ₹1,113 |
| AA-2802 | 75 X 35 X 8 mm | AA-280 | ₹1,518 |
| AA-2803 | 100 X 40 X 10 mm | AA-280 | ₹1,822 |
| AA-2804 | 150 X 40 X 10 mm | AA-280 | ₹2,429 |
| AA-2805 | 200 X 50 X 12 mm | AA-280 | ₹3,643 |
| AA-2806 | 250 X 50 X 12 mm | AA-280 | ₹4,039 |
| AA-2807 | 300 X 60 X 12 mm | AA-280 | ₹4,444 |
| AA-2808 | 500 X 50 X 15 mm | AA-280 | ₹13,101 |
| AA-2809 | 600 X 60 X 20 mm | AA-280 | ₹15,714 |
Long-Term Accuracy & Care Guidelines
- Store in a dry, temperature-stable environment to prevent thermal expansion
- Wipe the reference edge with a clean, lint-free cloth after each use
- Avoid dropping or striking the tool to preserve the ground knife profile
- Apply a thin protective oil layer during long-term storage to prevent rust
- Verify calibration periodically against certified master straight edges
Industrial Inspection & Calibration Use Cases
- Surface flatness verification for engine blocks and machine tool beds
- Reference surface calibration for layout tools and industrial guide rails
- Mating surface and splitting line inspection for stamping dies
- Flush fitting validation for complex injection mold components
- Precision-ground plate and fixture alignment in high-tolerance workshops
Light-Gap Inspection Methodology
- The sharp knife edge limits surface contact to a single reference line
- Enables visual detection of minute deviations via controlled light seepage
- Ideal for verifying absolute straightness and parallelism on machined parts
- High-sensitivity technique reveals gaps as small as fractions of a micron
- Provides reliable gap measurement without requiring complex electronic sensors
Precision Knife Edge Design & Construction
- Crystal Series AA-280 features a precision-ground bevelled working edge
- Manufactured from high-quality tool steel for maximum wear resistance
- Heat-treated to a consistent 55 HRC ± 2 HRC hardness rating
- Strictly compliant with IS-3512-1966 dimensional and quality standards
- Each unit ships securely in an individual wooden box for safe transit
Frequently asked
How does the knife edge improve measurement accuracy?
The bevelled profile minimizes contact area, allowing light-gap detection of sub-micron deviations.
Is this straight edge suitable for workshop floor conditions?
Yes, the 55 HRC hardened tool steel construction resists wear and maintains straightness in industrial environments.
What standard governs the dimensional tolerances?
Manufacturing strictly follows the IS-3512-1966 standard for dimensional accuracy and quality control.
More questions buyers ask
What is a knife edge straight edge used for?
A knife edge straight edge is a precision tool used for checking surface flatness and straightness with high accuracy. The knife edge allows for line contact, making it easier to spot deviations.
What material is the Crystal straight edge made from?
It is manufactured from high-grade, wear-resistant hardened and ground steel to ensure durability and maintain accuracy over time.
Is the Crystal straight edge corrosion-resistant?
The tool is made of steel and should be properly maintained. Always store it in a dry environment and apply a light oil coating to prevent rust and corrosion.
What is the hardness rating of this straight edge?
The Crystal knife edge straight edge is hardened to 58-60 HRC, providing excellent wear resistance for demanding industrial use.
Does this product come with a warranty?
Yes, all Crystal measuring instruments come with a 1-year manufacturer's warranty against manufacturing defects. We provide a GST invoice for all purchases.
Who should choose the Crystal AA-2801 (50mm) model?
The 50mm AA-2801 is ideal for small, high-precision work, such as inspecting small machined parts, tool and die making, or detailed layout tasks where space is limited.
Who should choose the Crystal AA-2805 (200mm) model?
The 200mm AA-2805 is a versatile mid-range option suitable for general machine shop use, aligning shorter workpieces, and quality control on medium-sized components.
Who should choose the Crystal AA-2809 (600mm) model?
The 600mm AA-2809 is designed for checking the flatness and alignment of longer surfaces, such as machine beds, large fixtures, and long guideways in industrial machinery.
What is the main difference between the 150mm and 300mm models?
The primary difference is the length. The 150mm model is for smaller, intricate jobs, while the 300mm model provides a longer reference surface for medium-sized tasks like aligning machine setups or checking larger parts.
How do I choose between the 500mm and 600mm straight edges?
Choose based on your workpiece size. The 600mm model offers the longest reference for maximum accuracy on large machine beds and surfaces. The 500mm is a slightly more manageable but still very capable option for large-scale inspection.
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Full description
Crystal Hardened & Ground Knife Edge Straight Edges ensure accurate layout and inspection in metalworking environments per IS-3512-1966. The AA-2801 model features compact 50 X 30 X 8 mm dimensions suitable for small-scale machining. • Compact 50 X 30 X 8 mm size fits tight workspaces • Hardened steel construction resists wear during use • Knife edge allows accurate alignment on small parts