Rockwell Hardness Testers

Rockwell hardness tester: HRA, HRB, HRC [10]

Superficial Rockwell hardness tester: 15N, 30N, 45N, 15T, 30T, 45T, 15W, 30W, 45W, 15X, 30X, 45X, 15Y, 30Y, 45Y

Plastic Rockwell hardness tester: HRE, HRL, HRM

Twin Rockwell hardness tester (also named as Rockwell & superficial Rockwell hardness tester): HRA, HRB, HRC,15N, 15T, 15W, 15X, 15Y, 30N, 30T, 30W, 30X, 30Y, 45N, 45T, 45W, 45X, 45Y

Scales and values[edit]

There are several alternative scales, the most commonly used being the "B" and "C" scales. Both express hardness as an arbitrary dimensionless number.

Various Rockwell scales[15]
AHRA60 kgf120° diamond spheroconicalTungsten carbide1000.002mm
BHRB100 kgf116-inch-diameter (1.588 mm) steel sphereAluminium, brass, and soft steels1300.002mm
CHRC150 kgf120° diamond spheroconicalHarder steels >B1001000.002mm
DHRD100 kgf120° diamond spheroconical1000.002mm
EHRE100 kgf18-inch-diameter (3.175 mm) steel sphere1300.002mm
FHRF60 kgf116-inch-diameter (1.588 mm) steel sphere1300.002mm
GHRG150 kgf116-inch-diameter (1.588 mm) steel sphere1300.002mm
HHRH60 kgf18-inch-diameter (3.175 mm) steel sphereAluminum, Zinc, Lead 
KHRK150 kgf18-inch-diameter (3.175 mm) steel sphereBearing alloy, tin, hard plastic materials
Also called a brale indenter
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