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Thursday March 11th, 2010
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Ball Grades

ABMA
Grade		 Round
DIA Toler
Per Ball		 Uniformity
DIA Toler
Per Unit
Container		 Basic
DIA
Toler		 Marking
Increment		 Surface
Roughness in
Micro-inches
3 .000003"
(.08)		 .000005"
(.13)		 ±.000030"
(±.75)		 .000010
(.25)		 0.5
(0.012)
5 .000005"
(.13)		 .000010"
(.25)		 +.000050/-.000040
(+1.25/-1)		 .000010
(.25)		 0.8
(0.02)
10 .000010"
(.25)		 .000020"
(.5)		 +.000050/-.000040
(+1.25/-1)		 .000010
(.25)		 1.0
(0.025)
16 .000016"
(0.4)		 .000032"
(.8)		 +.000050/-.000040
(+1.25/-1)		 .000010
(.25)		 1.0
(0.025)
24 .000024"
(0.6)		 .000048"
(1.2)		 ±.0001"
(±2.5)		 .000010
(.25)		 2.0
(0.05)
48 .000048"
(1.2)		 .000096"
(2.4)		 ±.0002"
(±5)		 .000050
(1.25)		 3.0
(0.08)
100 .000100"
(2.5)		 .0002"
(5)		 ±.0005"
(±12.5)		 * 5.0
(0.125)
200 .000200"
(5)		 .0004"
(10)		 ±.001"
(±25)		 * 8.0
(0.2)
500 .0005"
(13)		 .0010"
(25)		 ±.002"
(±50)		 * *
1000 .0010"
(25)		 .0020"
(50)		 ±.005"
(±125)		 * *
* Not Applicable (microns)
ITI
Valve Grades		 Roundness
DIA Toler
Per Ball		 Basic
DIA
Toler		 Surface
Roughness in
Micro-inches
48V .000048" ±.001" 3.0
100V .0001" ±.002" 5.0
200V .0002" ±.003" 8.0
500V .0005" ±.005" *
* Not Applicable
Balls used in valves usually require close control of roundness and surface finish to insure leak-tight operation. Size variations, however, are not usually critical. The ITI valve ball grades above have been established to complement the ABMA grades for industries using balls for valves and related applications.
ITI
Plastics		 Roundness
DIA Toler		 Basic
DIA
Toler
500P .0005" ±.001"
1000P .001" ±.002"
2000P .002" ±.003"
3000P .003" ±.005"
Plastics, because of their reduced hardness and stability, present certain manufacturing problems. The ITI grades above represent the various combinations of tolerances practical to produce.

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