Yamamoto Test Blocks

Yamamoto test blocks represent the premier test blocks in the industry and are the de facto standard for reference.
Yamamoto Test Blocks

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.


Yamamoto Test Blocks Features and 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

  • Yamamoto Rockwell Test Blocks +

    • Part no. TNY-C20

      Scale: HRC, Value: 20 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 51 mm

    • Part no. TNY-C30

      Scale: HRC, Value: 30 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 51 mm

    • Part no. TNY-C35

      Scale: HRC, Value: 35 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 51 mm

    • Part no. TNY-C40

      Scale: HRC, Value: 40 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 51 mm

    • Part no. TNY-C45

      Scale: HRC, Value: 45 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 51 mm

    • Part no. TNY-C50

      Scale: HRC, Value: 50 (+/-1), Traceable: Yes, Tolerance: +/-0.1, Block Size (diameter): 51 mm

    • Part no. TNY-C55

      Scale: HRC, Value: 55 (+/-1), Traceable: Yes, Tolerance: +/-0.1, Block Size (diameter): 51 mm

    • Part no. TNY-C60

      Scale: HRC, Value: 60 (+/-1), Traceable: Yes, Tolerance: +/-0.1, Block Size (diameter): 51 mm

    • Part no. TNY-C62

      Scale: HRC, Value: 62 (+/-1), Traceable: Yes, Tolerance: +/-0.1, Block Size (diameter): 51 mm

    • Part no. TNY-C64

      Scale: HRC, Value: 64 (+/-1), Traceable: Yes, Tolerance: +/-0.1, Block Size (diameter): 51 mm

    • Part no. TNY-C67

      Scale: HRC, Value: 67 (+/-1), Traceable: Yes, Tolerance: +/-0.1, Block Size (diameter): 51 mm

    • Part no. TY-A56

      Scale: HRA, Value: 56 (+/-1), Traceable: No, Tolerance: +/-0.3, Block Size (diameter): 64 mm

    • Part no. TY-A65

      Scale: HRA, Value: 65 (+/-1), Traceable: No, Tolerance: +/-0.3, Block Size (diameter): 64 mm

    • Part no. TY-A71

      Scale: HRA, Value: 71 (+/-1), Traceable: No, Tolerance: +/-0.3, Block Size (diameter): 64 mm

    • Part no. TY-A75

      Scale: HRA, Value: 75 (+/-1), Traceable: No, Tolerance: +/-0.3, Block Size (diameter): 64 mm

    • Part no. TY-A78

      Scale: HRA, Value: 78 (+/-1), Traceable: No, Tolerance: +/-0.3, Block Size (diameter): 64 mm

    • Part no. TY-A81

      Scale: HRA, Value: 81 (+/-1), Traceable: No, Tolerance: +/-0.3, Block Size (diameter): 64 mm

    • Part no. TY-A83

      Scale: HRA, Value: 83 (+/-1), Traceable: No, Tolerance: +/-0.3, Block Size (diameter): 64 mm

    • Part no. TY-A85

      Scale: HRA, Value: 85 (+/-1), Traceable: No, Tolerance: +/-0.3, Block Size (diameter): 64 mm

    • Part no. TY-A87

      Scale: HRA, Value: 87 (+/-1), Traceable: No, Tolerance: +/-0.3, Block Size (diameter): 64 mm

    • Part no. TY-B32

      Scale: HRB, Value: 32 (+/-3), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-B42

      Scale: HRB, Value: 42 (+/-3), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-B52

      Scale: HRB, Value: 52 (+/-3), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-B62

      Scale: HRB, Value: 62 (+/-3), Traceable: No, Tolerance: +/-0.4, Block Size (diameter): 64 mm

    • Part no. TY-B72

      Scale: HRB, Value: 72 (+/-3), Traceable: No, Tolerance: +/-0.4, Block Size (diameter): 64 mm

    • Part no. TY-B82

      Scale: HRB, Value: 82 (+/-3), Traceable: No, Tolerance: +/-0.4, Block Size (diameter): 64 mm

    • Part no. TY-B90

      Scale: HRB, Value: 90 (+/-3), Traceable: No, Tolerance: +/-0.4, Block Size (diameter): 64 mm

    • Part no. TY-B95

      Scale: HRB, Value: 95 (+/-3), Traceable: No, Tolerance: +/-0.4, Block Size (diameter): 64 mm

    • Part no. TY-B100

      Scale: HRB, Value: 100 (+/-3), Traceable: No, Tolerance: +/-0.4, Block Size (diameter): 64 mm

    • Part no. TY-C10

      Scale: HRC, Value: 10 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C20

      Scale: HRC, Value: 20 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C25

      Scale: HRC, Value: 25 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C30

      Scale: HRC, Value: 30 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C35

      Scale: HRC, Value: 35 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C40

      Scale: HRC, Value: 40 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C45

      Scale: HRC, Value: 45 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C50

      Scale: HRC, Value: 50 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C55

      Scale: HRC, Value: 55 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C60

      Scale: HRC, Value: 60 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C62

      Scale: HRC, Value: 62 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C64

      Scale: HRC, Value: 64 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C67

      Scale: HRC, Value: 67 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

    • Part no. TY-C70

      Scale: HRC, Value: 70 (+/-1), Traceable: Yes, Tolerance: +/-0.15, Block Size (diameter): 64 mm

  • Yamamoto Rockwell Superficial Test Blocks +

    • Part no. TY-15N75

      Scale: HR15N, Value: 75 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-15N80

      Scale: HR15N, Value: 80 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-15N85

      Scale: HR15N, Value: 85 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-15N87

      Scale: HR15N, Value: 87 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-15N90

      Scale: HR15N, Value: 90 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-15N92

      Scale: HR15N, Value: 92 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-30N41

      Scale: HR30N, Value: 41 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-30N50

      Scale: HR30N, Value: 50 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-30N60

      Scale: HR30N, Value: 60 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-30N67

      Scale: HR30N, Value: 67 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-30N73

      Scale: HR30N, Value: 73 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-30N78

      Scale: HR30N, Value: 78 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-30N81

      Scale: HR30N, Value: 81 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-30N83

      Scale: HR30N, Value: 83 (+/2), Traceable: No, Tolerance: +/-0.45, Block Size (diameter): 64 mm

    • Part no. TY-15T78

      Scale: HR15T, Value: 78 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-15T82

      Scale: HR15T, Value: 82 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-15T87

      Scale: HR15T, Value: 87 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-30T32

      Scale: HR30T, Value: 32 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-30T42

      Scale: HR30T, Value: 42 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-30T52

      Scale: HR30T, Value: 52 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-30T62

      Scale: HR30T, Value: 62 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-30T72

      Scale: HR30T, Value: 72 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-30T78

      Scale: HR30T, Value: 78 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

  • Yamamoto Rockwell Special Order Scales +

    • Part no. TY-E90

      Scale: HRE, Value: 90 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-L92

      Scale: HRL, Value: 92 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-L118

      Scale: HRL, Value: 118 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-M67

      Scale: HRM, Value: 67 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-M107

      Scale: HRM, Value: 107 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-R105

      Scale: HRR, Value: 105 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

    • Part no. TY-R123

      Scale: HRR, Value: 123 (+/2), Traceable: No, Tolerance: +/-0.5, Block Size (diameter): 64 mm

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