Diamond Pyramid Hardness Test
This test, more commonly known as the vickers test finds greater use in the laboratory than the workshop. It employs a pyramid shaped diamond with an included angle of 136? which is impressed into the specimen using loads of 5 to 120 kg making a small square impression. This test is used for finished or polished components because the impression can be very small. The diamond pyramid hardness number is obtained from a calculation based on measuring the diagonals of the impressions in the steel.
