Mitutoyo offers four main Rockwell Hardness tester deigns

The Dial HR210, the Digital HR320 MS Rockwell and Superficial model, the HR430 model featuring the dial a weight system and automatic brake/start mechanism in both Rockwell Only and the Rockwell/ Superficial Twin tester configuration. The last type is our HR500 Series which features a similar brake/ start design but also includes a closed loop electronic loading system as well as control over all test parameters such as loading speed and scale selection.

Let’s start with the Dial type HR210. It was designed to be an economical test for those requiring an accurate Rockwell test at an economical price. It features the full 6.5″ capacity without the need to cut a hole in the table for the elevating screw and most importantly, it uses a motor to apply and remove the major test force instead of the oil dash pot system found on some inexpensive imports. This assures that operator influence is reduced and tests run much more consistently.

The HR320 features a digital display with the corresponding benefits of 0.1 HR units, common scale conversions, an offset for cylindrical type corrections, and all three timing functions are adjustable. Its twin tester design allows the operator to test on all 15 Rockwell scales and all 15 Superficial scales when optional indenters are used. The adjustable hanging weight system is used to keep costs down and is a good option when you need a highly versatile tester for future testing requirements.

The two HR430 testers are similar to the digital HR320 model but the dial a weight system allows the testing scales to be changed with much less operator input. Just turn the knob and the test force is set. The automatic brake and test initiation further simplifies the test method.

The Advanced HR500 Series is for the user that wants the most accurate and repeatable results. The projected nose design allows for ID testing down to 22mm with an optional cut down indenter or 40mm for the standard model. The design also lets the elevating screw hang over the edge of the table so the full 8.1″ capacity is available without cutting holes on this model as well. The closed loop loading design does all the work of changing the scale for the operator except change the indenter. Simply select scale from the menu and all scales are selected based on the indenter type so changing from HRC to HR45N is on the same screen. A power elevating screw model is also available but the ease of use of the HR521 makes it the most popular model we offer.

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