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| ?? ??? ??? | ??? ?? ? ??? ???? | Micro Vickers with sample preparation |
2. Check Sample Size, Shape And Holding Method
Fasteners are small, round, threaded, and sometimes difficult to hold during testing. If the part moves, tilts, or rolls during loading, the hardness result may become unstable. This is why sample support is a key part of fastener hardness testing.
Bolts may be tested on the head, shank, or cross-section. Screws and pins may require small-part holders. Round parts may require V anvils. Thin or very small fasteners may need mounting and polishing before Micro Vickers testing. The fixture should be selected according to real production samples, not only the machine catalog.
Before selecting equipment, confirm:
Fastener type, diameter, length, head shape, and thread condition.
Whether the test area is flat, curved, threaded, coated, or heat-treated.
Whether the part can be tested directly or needs sectioning.
Whether a flat anvil, V anvil, small-part fixture, or custom holder is needed.
Whether the sample has enough thickness for the selected hardness method.
Whether testing should be done on surface, core, head, shank, or cross-section.
3. Use Rockwell Testing For Fast Production QC When Suitable
Rockwell hardness testing is useful for many fastener manufacturers because it is fast and easy to use for batch inspection. It is commonly applied to larger bolts, studs, nuts, washers, and heat-treated fasteners when the test surface and support are suitable.
However, Rockwell testing is not always suitable for every fastener. Very small screws, thin sections, curved surfaces, or shallow hardened layers may require Vickers or Micro Vickers testing instead. Buyers should confirm the required scale, indenter, sample support, and minimum thickness before using Rockwell as the main method.
| Rockwell Testing Is Suitable When | Possible Risk | Control Method |
|---|---|---|
| The fastener has enough flat test area | Wrong location may not represent the part | Define head, shank, or specified test area clearly |
| The sample has enough thickness | Backing effect may affect reading | Check scale requirement and minimum thickness |
| The part is stable on the anvil | Part may tilt or roll during loading | Use V anvil, flat anvil, or custom fixture |
| The required scale is HRC, HRB, or HRA | Wrong scale may cause customer rejection | Confirm drawing or customer standard before testing |
4. Use Micro Vickers Testing For Small Screws, Thin Layers And Case Depth
Micro Vickers testing is important when the fastener is too small for stable Rockwell testing, when the test area is limited, or when the supplier needs to inspect case depth or surface-hardened layers. It uses a small indentation and low test force, making it suitable for small screws, precision pins, thin sections, coatings, and carburized or nitrided layers.
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