Category: 硬さと強さ

What is material strength, how it is defined and how it is measured. And why that  is important for tools!...

What is hardness, how is it defined and how is it measured?...

Material strength and hand tools, how important is it and why? Let's discuss ......

Both hardness and strength are essential tool quality criteria. Are they actually connected and how?...

Rockwell hardness testing and especially HRC for the type "C"  it is one of the most common methods for hardness testing in the World. Why this is that more than 100 years after its invention and how does Rockwell testing actually work?...