High quality Japanese made Hardness Test Files are an easy to use, quick and inexpensive tool used to approximate material hardness in Rockwell scale.

Usage is simple.  Just slide the test files across the surface, one by one, starting from the hardest until reaching a file soft enough to not record a result.  Based on reaching a non-result, the material must be harder than the file with no result and softer than the lowest file that gave a result.  

For Example:

Start with the black file.  If it marks the material the hardness of the material is less than 65 HRC.  Then proceed to the blue file.  If it does not mark the material then the hardness must be between 60 HRC and 65 HRC.  If it does mark the material, then proceed to the next file (green.)  If it does not mark the material then the result is between 55 HRC and 60 HRC, if it does mark the material then move on accordingly to the next file and so forth.



Red 40 HRC 40-42 HRC 392-412 HV
Yellow 45 HRC 45-47 HRC 446-471 HV
Light Green 50 HRC 50-52 HRC 513-544 HV
Green 55 HRC 55-57 HRC 595-633 HV
Blue 60 HRC 60-62 HRC 697-746 HV
Black 65 HRC 64-66 HRC 800-865 HV



Brand Tsubosan
Shipping Weight 0.2000kg
Shipping Width 0.100m
Shipping Height 0.020m
Shipping Length 0.220m
Shipping Cubic 0.000440000m3

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