Question 1

What is 21 HRB in HV?

Accepted Answer

21 HRB = 37.8 HV. Use the converter on this page to convert to other hardness units instantly.

Question 2

How do you convert HRB to HV?

Accepted Answer

Formula (approximate): 1 HRC ≈ 10.2 HV · 1 HRB ≈ 1.8 HV · 1 Mohs ≈ 0.1 HV — approximate; real conversions vary by material per ASTM E140. Multiply your HRB value by the appropriate factor to get HV, or use the interactive converter above.

Question 3

What is 37.8 HV in HRB?

Accepted Answer

37.8 HV = 21 HRB.

HRB	HV
15 HRB	27
17 HRB	30.6
19 HRB	34.2
21	37.8
23 HRB	41.4
25 HRB	45
27 HRB	48.6

21 HRB to HV

Formula (approximate)