I.S. 2898 (INDIA) 1.S.0. STANDARD G.B. 308 (GREAT BRITAIN)

FROM AND SURFACE ROUGHNESS TOLERANCE
GRACE BALL DIAMETER
VARIATION		 DEVIATION FROM 
SPHERICAL FORM		 SURFACE
ROUGHNESS
MAXIMUM VALUES IN MICROMETERS
3 0.08 0.08 0.012
5 0.13 0.13 0.02
10 0.25 0.25 0.025
16 0.4 0.4 0.032
20 0.5 0.5 0.04
28 0.7 0.7 0.05
40 1 1 0.08
100 2.5 2.5 0.125
200 5 5 0.2

SORTING TOLERANCES AND GAUGES

GRADE LOT DIAMETER
VARIATION		 GAUGE PREFERRED
GAUGES		 SUB-GAUGE
INTERVAL		 SUBGAUGES
VALUES IN MICROMETERS
3 0.13 0.5 -5 ~ -0.5 ~ 0 ~ + 0.5 ~ + 5 0.1 -0.2 ~ -0.1~ 0 ~ + 0.2 ~ +0.2
~5 0.25 1 -5 ~ -1  ~ 0 ~ + 1      ~ + 5 0.2 -0.4 ~ -0.2~ 0 ~ + 0.2 ~ +0.4
10 0.5 1 -9 ~ -1  ~ 0 ~ + 1      ~ + 9 0.2 -0.4 ~ -0.2~ 0 ~ + 0.2 ~ +0.4
16 0.8 2 -10 ~ -2  ~ 0 ~ + 2    ~ + 10 0.4 -0.8 ~ -0.4~ 0 ~ + 0.4 ~ +0.8
20 1 2 -10 ~ -2  ~ 0 ~ + 2    ~ + 10 0.4 -0.8 ~ -0.4~ 0 ~ + 0.4 ~ +0.8
28 1.4 2 -12 ~ -2  ~ 0 ~ + 2    ~ + 12 0.4 -0.8 ~ -0.4~ 0 ~ + 0.4 ~ +0.8
40 2 4 -16 ~ -4  ~ 0 ~ + 4    ~ + 16 0.8 -1.6 ~ -0.8~ 0 ~ + 0.8 ~ +1.6
100 5 10 -40 ~ -10  ~ 0 ~ + 10  ~ + 40 2 -4   ~  -2  ~ 0 ~ +  2  ~  +   4
200 10 15 -60 ~ -15  ~ 0 ~ + 15  ~ + 60 3 -6   ~   -3   ~  0  ~ + 3 ~ + 6

ANSI/AFBMA- (USA)

GRADE BALL DIA
VARIATION		 DEVIATION FROM
SPHERICAL FROM		 SURFACE 
ROUGHNESS		 LOT DIA
VARIATION		 BASIC DIA.
TOLERANCE
3 0.08 0.08 0.012 0.13 0,75
5 0.13 0.13 0.02 0.25 1.25
10 0.25 0.25 0.025 0.5 2.5
16 0.4 0.4 0.025 0.8 2.5
24 1.20.6 0.6 0.05 1.2 2.5
48 2.5 1.2 0.08 2.4 5
100 5 2.5 0.125 5 12.5
200 13 5 0.2 10 25
500 25 13 ---- 25 50
1000 25 25 ---- 50 125


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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