Rockwell vs Brinell vs Vickers: Choosing a Hardness Tester

Rockwell vs Brinell vs Vickers: Choosing a Hardness Tester
A heat-treatment shop needs to verify 300 hardened shafts before the truck leaves at 4 p.m. A foundry gets a rejection notice and must produce HBW values on a coarse-grained casting. A mill engineer wants hardness data on a 40-tonne roll that is already installed. Each of these jobs points to a different type of hardness tester. Knowing the main hardness tester types — Rockwell, Brinell, Vickers, and portable Leeb — is the fastest way to buy the right instrument the first time. This guide compares all four side by side: how each method works, which scales apply, where each method excels, and where each one falls short.
What Is Hardness Testing? (Quick Primer)
Hardness testing measures how well a material resists a permanent indent. A defined indenter is pressed into the surface with a defined force, and the result — indentation depth or indentation size — is converted into a hardness value. It is one of the quickest mechanical checks in quality control, and in its portable forms it qualifies as non-destructive testing (NDT): the part stays in service with, at most, a small mark.
The method matters because the four methods answer different questions. Bench methods such as Rockwell, Brinell and Vickers measure the indent itself, so the part has to come to the instrument. Portable rebound methods such as Leeb measure how an impact body bounces back, so they can test parts that will never fit on a bench. Pick the wrong one and you damage the part, get unstable readings, or lose hours to setup.

The 4 Main Hardness Tester Types at a Glance
- Rockwell (ASTM E18) — measures indentation depth; direct scale readout in HRC/HRB/HRA; the fast production method.
- Brinell (ASTM E10) — large ball indenter, indent measured optically; results in HBW; the method for castings and coarse grain.
- Vickers (ASTM E92) — diamond pyramid, indent measured optically; results in HV; one continuous scale from soft metals to hardened tool steel.
- Leeb (ASTM A956) — rebound method for portable testing; Leeb value (HL), converted to HRC/HBW/HV; for large or installed parts.
Hardness Tester Comparison Chart: Rockwell vs Brinell vs Vickers vs Leeb

    Rockwell Hardness Testers: Built for Production Speed
A Rockwell hardness tester is built for speed. It measures the depth of the indent, not its width, so the scale value appears directly on the display — no microscope, no optical measurement. That is why heat-treatment shops run a Rockwell hardness tester at the bench next to the furnace, part after part, all shift long.
The scale depends on the material and the load:
- HRC — diamond cone indenter, 150 kgf (1,471 N) total load; the standard scale for hardened steel, roughly 20–70 HRC.
- HRB — 1/16 in (1.588 mm) ball, 100 kgf (981 N); for soft steels, copper and aluminum alloys.
- HRA — diamond cone, 60 kgf (588 N); for thin hardened layers and carbide, where the HRC load would break through.
A bench instrument in accordance with ASTM E18 is verified quickly against a calibrated test block before each shift, so you know the machine is healthy before the first part.
Best Applications
- Routine QC of through-hardened parts: shafts, gears, bearings, dies.
- Incoming inspection of steel bar and forgings against mill certificates.
- Fast sorting of mixed or suspect lots — an HRC readout takes seconds.
Limitations
- The surface must be smooth, clean and solidly supported on an anvil; scale, oxide or a curved face shifts the reading.
- Very thin parts need a lighter scale or a different method.
- It is a poor fit for rough castings — the indentation depth is too small to average over coarse grain.
For production floors doing daily hardness checks, our [Rockwell hardness tester range] covers the common HRC/HRB workloads.