Mẫu chuẩn độ cứng Yamamoto HRC25, HRC40, HRC64, HV100, HV500, HV800,

Rockwell Blocks

Diameter

Nominal Hardness Values

Variation

NIST Traceable

HRA

64mm

56, 65, 71, 75, 78, 81, 83, 85, 87

+/-0.3

No

HRB 

64mm

32, 42, 52

+/-0.5

No

HRB

64mm

62, 72, 82, 90, 95, 100

+/-0.4

No

HRC

64mm

10, 20, 25, 30, 35, 40

+/-0.15

Yes

HRC

64mm

45, 50, 55, 60, 62, 64, 67, 70

+/-0.1

Yes

HR15N

64mm

75, 80, 85, 87, 90, 92

+/-0.45

No

HR30N

64mm

41, 50, 60, 67, 73, 78, 81, 83

+/-0.5

No

HR15T

64mm

78, 82, 87

+/-0.5

No

HR30T

64mm

32, 42, 52, 62, 72, 78

+/-0.5

No

HRE

64mm

90

+/-0.5

No

HRL

64mm

92, 118

+/-0.5

No

HRM

64mm

67, 107

+/-0.5

No

HRR

64mm

105, 123

+/-0.5

No

HRC

51mm

20, 25, 30, 35, 40, 45

+/-0.15

No

HRC 

51mm

50, 55, 60, 62, 64, 67

+/-0.5

No