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STANDARD


A.F.B.M.A. INTERNATIONAL STANDARDS
A.F.B.M.A. STANDARDS(U.S.A.)
AFBMA GRADS
Variation of ball diameter/Roundness
Lot diameter variation
Basic diameter tolerance
Maximum increments
Surface roughness
Inches
µm
Inches
µm
Inches
µm
Inches
µm
Inches
µm
3
0.000003
0.0762
0.000005
0.1270
±0.00003
±0.762
0.0000005
0.0127
0.00001
0.254
5
0.000005
0.1270
0.000010
0.2540
±0.00005
±1.27
0.0000008
0.02032
0.00001
0.254
10
0.000010
0.2540
0.000020
0.5080
±0.00010
±2.54
0.00001
0.0254
0.00001
0.254
15
0.000015
0.3810
0.000030
0.7620
±0.00010
±2.54
0.00001
0.0254
0.00001
0.254
16
0.000016
0.4064
0.000032
0.8128
±0.00010
±2.54
0.00001
0.254
0.00001
0.254
24
0.000024
0.6096
0.000048
1.2192
±0.00010
±2.54
0.000002
0.0508
0.00001
0.254
25
0.000025
0.6350
0.000050
1.2700
±0.00010
±2.54
0.000002
0.0508
0.00001
0.254
48
0.000048
1.2192
0.000096
2.4384
±0.00020
±5.08
0.000003
0.0762
0.00005
1.27
50
0.000050
1.27
0.000100
2.54
±0.00030
±7.62
0.000003
0.0762
0.00005
1.27
100
0.000100
2.54
0.000200
5.08
±0.00050
±12.7
0.000005
0.127
0.00010
2.54
200
0.000200
5.08
0.000400
10.20
±0.00100
±25.4
0.000008
0.2032
0.00020
5.08
300
0.000300
7.62
0.000400
15.24
±0.00100
±25.4
-
-
0.00030
7.62
500
0.000500
12.70
0.001000
25.40
±0.00200
±50.8
-
-
0.00050
12.70
1000
0.001000
25.40
0.002000
50.80
±0.00500
±127
-
-
0.00100
25.40
2000
0.002000
50.80
0.004000
101.60
±0.00500
±127
-
-
0.00200
50.80
3000
0.003000
76.20
0.006000
152.40
±0.00500
±127
-
-
0.00300
76.20