Units of hardness measure by the resistance of a material (typically metal) to indentation by a spherical tipped conical diamond indentor (Rockwell C and A) or, in the case of softer materials, a hardened steel sphere indentor (Rockwell B).
A relative measure of hardness. Rockwell C Scale is used for hard materials, Rockwell B for softer materials, such as sheet metal.
A method of measure hardness - normally for bearings between 55 to 58 on the 'C' scale.
A method of determining the surface hardness of a substance. Degree of hardness.
An indentation hardness test based on the depth of penetration.
A measure of the surface hardness of a material. A value derived from the increase in depth of an impression as the load of a steel indenter is increased from a fixed minimum value to a higher value and then returned to the minimum value. The values are quoted with a letter prefix corresponding to a scale relating to a given combination of load and indenter.
The type of hardness testing used to check the hardness of most hardened materials. Rockwell C process uses 120deg diamond with a weight of 150kg. of preload on it. This is loaded into material, and depth of the indent is measured . The result of this is given in a Rockwell C measurement. e.g. A cast iron cam is approximately 56r/c A steel roller cam is approximately 60r/c
A method of determining the surface hardness of steel or other material. The higher the number the harder the surface. Usually denoted by Rc followed by the number. Rotary steel cutting dies may fall within a range of Rc40 to Rc72.
A common method of testing a plastic material for resistance to indentation in which a diamond or steel ball, under pressure, is used to pierce the test specimen. The load used is expressed in kilograms and a 10-kilometer weight is first applied and the degree of penetration noted. The so-called major load (60 to 150 kilograms) is next applied and a second reading obtained. The hardness is then calculated as the difference between the two loads and expressed with nine different prefix letters to denote the type of penetrator used and the weight applied as the major load.
a test for hardness (resistance to indentation) in which a hardened steel ball or diamond point is pressed into the material under test.
relative resistance of a metal to indentation by a diamond cone, as expressed in hardness-scale units (A, B, C or G)
Standard American hardness test with several ranges of loads and indenters, HRB, HRC.
A term that signifies the hardness of the ball, which is measured on various scales on a device, called a Rockwell tester.
A method for determining the hardness of metals by determining the depth of penetration of a steel ball.