Salem Specialty Ball Company
Charts - Salem Specialty Ball


A.F.B.M.A Ball Grades and Tolerances

 Grade

Sphericity

Basic Diameter Tolerance

 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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