Rockwell Hardness Tests					
Cylindrical Conversion Chart 53					
From Wilson¨ Conversion Chart					
Add Correction to Observed Reading					
"Scales C, D, A for"					
Diameter of Specimen in inches (mm)					
Observed	 1/4	 3/8	 1/2	 5/8	 3/4
Reading	(6.4)	(10)	(13)	(16)	(19)
90	0.5	0.0	0.0	0.0	0.0
85	0.5	0.5	0.5	0.0	0.0
80	0.5	0.5	0.5	0.5	0.5
75	1.0	0.5	0.5	0.5	0.5
70	1.0	1.0	0.5	0.5	0.5
65	1.5	1.0	1.0	0.5	0.5
60	1.5	1.0	1.0	0.5	0.5
55	2.0	1.5	1.0	1.0	0.5
50	2.5	2.0	1.5	1.0	1.0
45	3.0	2.0	1.5	1.0	1.0
40	3.5	2.5	2.0	1.5	1.0
35	4.0	3.0	2.0	1.5	1.5
30	5.0	3.5	2.5	2.0	1.5
25	5.5	4.0	3.0	2.5	2.0
20	6.0	4.5	3.5	2.5	2.0
"Scales B, F, G for"					
Diameter of Specimen in inches (mm)					
Observed	 1/4	 3/8	 1/2	 5/8	 3/4
Reading	(6.4)	(10)	(13)	(16)	(19)
100	3.5	2.5	1.5	1.5	1
90	4	3	2	1.5	1.5
80	5	3.5	2.5	2	1.5
70	6	4	3	2.5	2
60	7	5	3.5	3	2.5
50	8	5.5	4	3.5	3
40	9	6	4.5	4	3
30	10	6.5	5	4.5	3.5
20	11	7.5	5.5	4.5	4
10	12	8	6	5	4
0	12.5	8.5	6.5	5.5	4.5