BS 240:1986

Foreword
Committees responsible
Method
Section one. General
1. Scope
2. Definitions
3. Symbols and designation of hardness
Section two. Determination of Brinell hardness
4. Principle
5. Apparatus
6. Conditions of test
7. Determination of f/D squared ratio and hardness
     scale
8. Test procedure
9. Calculation of Brinell hardness value
Section three. Direct verification of accuracy of the
testing machine
10. Principle
11. Force
12. Indentor
13. Measuring apparatus
14. Performance test
Section four. Indirect verification of accuracy of the
testing machine
15. Principle
16. Manufacture of hardness test blocks
17. Calibration of hardness test blocks
18. Standardizing machine
19. Indirect verification procedure
20. Assessment of accuracy of measuring apparatus
     and testing machine
Appendices
A. Monitoring the accuracy of the test machine
B. Advisory comment upon Brinell hardness testing
     procedure
C. Minimum thickness of test piece
D. Brinell hardness values (HB) for tests made on flat
     surfaces
Tables
1. Value of f/D squared for representative materials
2. Correlated values of ball diameter and force
     corresponding to values of f/D squared of 30, 10,
     5 and 1
3. Dimensions of indenter balls for testing machines
4. Hardness of indenter balls
5. Maximum permissible error of measuring system
6. Dimensions of hardness test blocks
7. Dimensions of indenter balls for standardizing
     machines
8. Test block hardness for verifiable hardness scales
9. Minimum thickness of test piece for f/D squared
     of 30, 10, 5 and 1
10. Brinell scale HB 10/3000
11. Brinell scale HB 10/1000
12. Brinell scale HB 10/500
13. Brinell scale HB 10/100
14. Brinell scale HB 5/750
15. Brinell scale HB 5/250
16. Brinell scale HB 5/125
17. Brinell scale HB 5/25
18. Brinell scale HB 2.5/187.5
19. Brinell scale HB 2.5/62.5
20. Brinell scale HB 2.5/31.25
21. Brinell scale HB 2.5/6.25
22. Brinell scale HB 2/120
23. Brinell scale HB 2/40
24. Brinell scale HB 2/20
25. Brinell scale HB 2/4
26. Brinell scale HB 1/30
27. Brinell scale HB 1/10
28. Brinell scale HB 1/5
29. Brinell scale HB 1/1
Figure
1. Principle of test and form of indentation

For metals with a hardness up to 600 HB at room temperature. Direct and indirect verification of the accuracy of the testing machine.