Steel Ball Sizes for completely round, spherical balls
Ball Diameter
in MM
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
5.50
6.00
Steel Ball Diameter
in MM
7.00
8.00
8.50
9.00
9.50
10.00
10.50
11.00
11.50
12.00
12.50
Steel Balls Diameter
in INCHES
Fraction Decimal
3/64" 0.047"
1/16" 0.063"
3/32" 0.094"
1/8" 0.125"
5/32" 0.156"
3/16" 0.188"
7/32" 0.219"
15/64" 0.234"
. .
. .
Steel Balls Diameter
in INCHES
Fraction Decimal
1/4" 0.250"
9/32" 0.281"
5/16" 0.313"
11/32" 0.344"
3/8" 0.375"
13/32" 0.406"
7/16" 0.438"
15/32" 0.469"
1/2" 0.500"
. .

Important Links
Grades of balls

   No of Balls per /Kg

 Burnishing Applications I.S. 2898 (INDIA),I.S.O. 3290 Standard, G.B 308 (G.B)
  How Balls  are made ANSI/AFBMA- (USA),  
    AFNOR NF E 22-381 - (FRANCE)
    DIN 5401 (GERMANY)

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