How to measure the Rockwell hardness of the Round head screw?

Test samples and requirements:

1.Measured workpiece: Round head screw(Material 45 steel)

2.Product specifications: Diameter 8mm

3.Measurement required:Measure the Rockwell hardness of round head screws

4.The instrument used Model: SU-400M

Current Pain Points:


1.Vickers hardness tester need operators with experienced skills and low efficiency. 

2.The portable Leeb hardness tester is not suitable for chrome-plated surface workpieces because the workpieces is too thin. The thickness of the workpiece must be above 50mm.

Our Sinowon Solution:

According to the current pain points of measurement, we decided to use a Ultrasonic Hardness Tester to measure the sample.

Sinowon Ultrasonic Hardness Tester SU-400M adopts 10N test force which can fully inspect the hardness of the Round head screw without damaging the workpiece, effectively guaranteeing the production quality of the product.

Because the single measurement time of the ultrasonic hardness tester is about 6 second per time, the efficiency is improved by 17 times compared with the desktop Rockwell hardness tester. And the indentation diameter after the ultrasonic hardness tester is 0.026mm, and the indentation diameter after the Rockwell hardness tester is 0.484mm (see picture 2 for the indentation). The ultrasonic hardness tester does not affect the subsequent assembly and use.

Picture 2. The size comparation between UCI Vickers indention and Rockwell HRC indention.

Test results:    

Testing time 1 2 3 4 5 Average value(HRC) Repeatability(HRC)
Hardness value 50.5 50.8 50.2 50.6 51.1 50.72 0.9

Note: Maximum Value: 51.1HRC,  Minimum value: 50.2HRC

Test conclusion:

SU-400M is able to measure the hardness of hardness of Irregular artifacts with precision, fast-speed and NDT solution.

SU-400M ultrasonic hardness tester has simple operation and high reliability. It only needs to prepare a standard sample to calibrate the instrument, which can achieve accurate hardness measurement.

While using the ultrasonic hardness tester to improve the quality control of the enterprise, it also reduces the loss and increases the profit of the enterprise.

You can also click the link to get more video information:

If you have any need, please feel free to contact us. We look forward to the pleasure of serving you.

Best regards

Sinowon Team

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