A.F.B.M.A Ball Grades and Tolerances
|
|
|
|
3
|
.000003"
|
+/- .00003" |
5
|
.000005"
|
+/-
.00005" |
10
|
.000010"
|
+/- .0001" |
25
|
.000025"
|
+/- .0001" |
50
|
.000050"
|
+/- .0002" |
100
|
.0001"
|
+/- .0005" |
200
|
.0002"
|
+/- .0010" |
500
|
.0005"
|
+/- .002" |
1000
|
.001"
|
+/-.005" |
Grade:
The guaranteed sphericity expressed in millionths
of an inch. For example, a grade 25 ball is spherically
accurate within 25 millionths of an inch.
Sphericity:
The difference between the largest diameter and the
smallest diameter on a single ball.
Basic
Diameter Tolerance: The maximum allowable
deviation from the basic diameter.
Plastic
Grades are different...
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