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Yamamoto test blocks represent the premier test blocks in the industry and are the de facto standard for reference. Yamamoto test blocks are reference materials, standardized to determine the average hardness of the block surface. The resulting certified value provides a reference number and tolerance that should be met during hardness tester verification to ensure compliance with performance standards. Yamamoto test blocks are calibrated in accordance with ASTM E18-00 section C using Rockwell HRC standard reference materials.
Features & Benefits
- Regular, Superficial and Special Blocks
- High precision, precision hardness tolerance
- Certified blocks traceable to NIST
- Calibrated in accordance with ASTM E18-00 section C using NIST Rockwell HRC standard reference material
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| Rockwell Blocks |
Diameter |
Nominal Hardness Values |
Variation |
NIST Traceable
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| HRA |
64mm
|
56, 65, 71, 75, 78, 81, 83, 85, 87 |
+/-0.3
|
No
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| HRB |
64mm
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32, 42, 52 |
+/-0.5
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No
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| HRB |
64mm
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62, 72, 82, 90, 95, 100 |
+/-0.4
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No
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| HRC |
64mm
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10, 20, 25, 30, 35, 40 |
+/-0.15
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Yes
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| HRC |
64mm
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45, 50, 55, 60, 62, 64, 67, 70 |
+/-0.1
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Yes
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| HR15N |
64mm
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75, 80, 85, 87, 90, 92 |
+/-0.45
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No
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| HR30N |
64mm
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41, 50, 60, 67, 73, 78, 81, 83 |
+/-0.5
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No
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| HR15T |
64mm
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78, 82, 87 |
+/-0.5
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No
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| HR30T |
64mm
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32, 42, 52, 62, 72, 78 |
+/-0.5
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No
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| HRE |
64mm
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90 |
+/-0.5
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No
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| HRL |
64mm
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92, 118 |
+/-0.5
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No
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| HRM |
64mm
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67, 107 |
+/-0.5
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No
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| HRR |
64mm
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105, 123 |
+/-0.5
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No
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| Rockwell Blocks |
Diameter |
Nominal Hardness Values |
Variation |
NIST Traceable
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| HRC |
51mm
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20, 25, 30, 35, 40, 45 |
+/-0.15
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No
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| HRC |
51mm
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50, 55, 60, 62, 64, 67 |
+/-0.5
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No
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| Brinell Blocks |
Diameter |
Nominal Hardness Values |
Variation |
NIST Traceable
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| HBW30 |
115mm
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150, 180, 200, 229, 250, 300, 350
400, 450, 500, 550, 600 |
+/-0.7%
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No
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| HBW5 |
115mm
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100, 125 |
+/-0.7%
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No
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| Vickers Blocks |
Diameter |
Nominal Hardness Values |
Variation |
NIST Traceable
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| HV |
25mm
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100, 200, 300, 400, 500, 600, 700
800, 900 |
+/-2.5%
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No
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| Yamamoto Test Blocks for Rockwell Testing |
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Model No.
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Scale
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Value
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Certified
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Tolerance
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Block Size (diameter)
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TNY-C20
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HRC
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20 (+/-1)
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Yes
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+/-0.15
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51mm
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| TNY-C25 |
HRC
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25 (+/-1)
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Yes
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+/-0.15
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51mm
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| TNY-C30 |
HRC
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30 (+/-1)
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Yes
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+/-0.15
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51mm
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| TNY-C35 |
HRC
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35 (+/-1)
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Yes
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+/-0.15
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51mm
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| TNY-C40 |
HRC
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40 (+/-1)
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Yes
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+/-0.15
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51mm
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| TNY-C45 |
HRC
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45 (+/-1)
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Yes
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+/-0.15
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51mm
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| TNY-C50 |
HRC
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50 (+/-1)
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Yes
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+/-0.1
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51mm
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| TNY-C55 |
HRC
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55 (+/-1)
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Yes
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+/-0.1
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51mm
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| TNY-C60 |
HRC
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60 (+/-1)
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Yes
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+/-0.1
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51mm
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| TNY-C62 |
HRC
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62 (+/-1)
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Yes
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+/-0.1
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51mm
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| TNY-C64 |
HRC
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64 (+/-1)
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Yes
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+/-0.1
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51mm
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| TNY-C67 |
HRC
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67 (+/-1)
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Yes
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+/-0.1
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51mm
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| TY-A56 |
HRA
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56 (+/-1)
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No
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+/-0.3
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64mm
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| TY-A65 |
HRA
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65 (+/-1)
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No
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+/-0.3
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64mm
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| TY-A71 |
HRA
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71 (+/-1)
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No
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+/-0.3
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64mm
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| TY-A75 |
HRA
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75 (+/-1)
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No
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+/-0.3
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64mm
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| TY-A78 |
HRA
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78 (+/-1)
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No
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+/-0.3
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64mm
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| TY-A81 |
HRA
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81 (+/-1)
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No
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+/-0.3
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64mm
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| TY-A83 |
HRA
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83 (+/-1)
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No
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+/-0.3
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64mm
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| TY-A85 |
HRA
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85 (+/-1)
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No
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+/-0.3
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64mm
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| TY-A87 |
HRA
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87 (+/-1)
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No
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+/-0.3
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64mm
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| TY-B32 |
HRB
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32 (+/-3)
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No
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+/-0.5
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64mm
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| TY-B42 |
HRB
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42 (+/-3)
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No
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+/-0.5
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64mm
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| TY-B52 |
HRB
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52 (+/-3)
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No
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+/-0.5
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64mm
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| TY-B62 |
HRB
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62 (+/-3)
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No
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+/-0.4
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64mm
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| TY-B72 |
HRB
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72 (+/-3)
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No
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+/-0.4
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64mm
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| TY-B82 |
HRB
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82 (+/-3)
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No
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+/-0.4
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64mm
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| TY-B90 |
HRB
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90 (+/-3)
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No
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+/-0.4
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64mm
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| TY-B95 |
HRB
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95 (+/-3)
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No
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+/-0.4
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64mm
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| TY-B100 |
HRB
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100 (+/-3)
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No
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+/-0.4
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64mm
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| TY-C10 |
HRC
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10 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C20 |
HRC
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20 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C25 |
HRC
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25 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C30 |
HRC
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30 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C35 |
HRC
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35 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C40 |
HRC
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40 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C45 |
HRC
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45 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C50 |
HRC
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50 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C55 |
HRC
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55 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C60 |
HRC
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60 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C62 |
HRC
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62 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C64 |
HRC
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64 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C67 |
HRC
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67 (+/-1)
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Yes
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+/-0.15
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64mm
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| TY-C70 |
HRC
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70 (+/-1)
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Yes
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+/-0.15
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64mm
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| Yamamoto Superficial Scales |
| Model No. |
Scale
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Value
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Certified
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Tolerance
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Block Size (diameter)
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| TY-15N75 |
HR15N
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75 (+/-2)
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No
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+/-0.45
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64mm
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| TY-15N80 |
HR15N
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80 (+/-2)
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No
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+/-0.45
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64mm
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| TY-15N85 |
HR15N
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85 (+/-2)
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No
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+/-0.45
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64mm
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| TY-15N87 |
HR15N
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87 (+/-2)
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No
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+/-0.45
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64mm
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| TY-15N90 |
HR15N
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90 (+/-2)
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No
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+/-0.45
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64mm
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| TY-15N92 |
HR15N
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92 (+/-2)
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No
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+/-0.45
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64mm
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| TY-30N41 |
HR30N
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41 (+/-2)
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No
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+/-0.45
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64mm
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| TY-30N50 |
HR30N
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50 (+/-2)
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No
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+/-0.45
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64mm
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| TY-30N60 |
HR30N
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60 (+/-2)
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No
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+/-0.45
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64mm
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| TY-30N67 |
HR30N
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67 (+/-2)
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No
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+/-0.45
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64mm
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| TY-30N73 |
HR30N
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73 (+/-2)
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No
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+/-0.45
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64mm
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| TY-30N78 |
HR30N
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78 (+/-2)
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No
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+/-0.45
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64mm
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| TY-30N81 |
HR30N
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81 (+/-2)
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No
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+/-0.45
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64mm
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| TY-30N83 |
HR30N
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83 (+/-2)
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No
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+/-0.45
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64mm
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| TY-15T78 |
HR15T
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78 (+/-2)
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No
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+/-0.5
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64mm
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| TY-15T82 |
HR15T
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82 (+/-2)
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No
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+/-0.5
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64mm
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| TY-15T87 |
HR15T
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87 (+/-2)
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No
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+/-0.5
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64mm
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| TY-30T32 |
HR30T
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32 (+/-2)
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No
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+/-0.5
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64mm
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| TY-30T42 |
HR30T
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42 (+/-2)
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No
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+/-0.5
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64mm
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| TY-30T52 |
HR30T
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52 (+/-2)
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No
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+/-0.5
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64mm
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| TY-30T62 |
HR30T
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62 (+/-2)
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No
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+/-0.5
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64mm
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| TY-30T72 |
HR30T
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72 (+/-2)
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No
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+/-0.5
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64mm
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| TY-30T78 |
HR30T
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78 (+/-2)
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No
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+/-0.5
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64mm
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| Yamamoto Special Order Scales |
| Model No. |
Scale
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Value
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Certified
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Tolerance
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Block Size (diameter)
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| TY-E90 |
HRE
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90 (+/-2)
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No
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+/-0.5
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64mm
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| TY-L92 |
HRL
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92 (+/-2)
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No
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+/-0.5
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64mm
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| TY-L118 |
HRL
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118 (+/-2)
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No
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+/-0.5
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64mm
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| TY-M67 |
HRM
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67 (+/-2)
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No
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+/-0.5
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64mm
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| TY-M107 |
HRM
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107 (+/-2)
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No
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+/-0.5
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64mm
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![]()
![]() Specification Sheets
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