AFNOR NF 22-381 - (FRANCE)
GRADE DIA
TOLERANCE
OF EACH CLASS		 THERETIC GAUGE INTERVAL EA. CLASS MAX.GAUGE
PER CLASS		 MAX. GAUGE
PER UNIT*		 EXTREME
INTERVALS
PER UNIT		 SPHERICAL DEVIATION ON DIA. "V" BLOCK OUT OF ROUND IN 120 ANGLE
4 0.2 0.1 2 0.1 0.1 0.05 0.1
8 0.4 0.2 4 0.2 0.2 0.1 0.2
12 0.6 0.3 6 0.3 0.3 0.15 0.3
20 1 0.5 10 0.5 0.5 0.25 0.5
40 2 1 20 1 1 0.5 1
80 4 2 40 2 2 1 2
120 6 3 60 3 3 1.5 3
200 10 5 100 5 5 2.5 5
400 20 10 200 10 10 5 10
800 40 20 400 20 20 10 20

* Gap between the largest and the smallest measure (only one measure per ball).

DIN 5401 (GERMANY)
CALSS NOMINAL
DIA. mm		 TOLER-
ENCES		 TOLERANCES
PER GROUP		 MEAN INTERVAL OF EACH GROUP SPHERICAL
DEVIATION
I 10 max 10.25 0.5 -10      ~     -1.5 -1 -0.5 0 +0.5 +1 +1.5         ~         +10 0.25
  25 max 10.50 1 -10       ~     -3 -2 -1 0 +1 +2 +3           ~          +10 0.5
III 25 max
25-50
50-75
75-100
100-125
125-150		 11
13.5
14
17.5
21
24.5		 2
3
4
5
6
7		 -10




 -8
-12


 -6
-9
-12
-15
-18
-21		 -4
-6
-8
-10
-12
-14		 -2
-3
-4
-5
-6
-7		 0
0
0
0
0
0		 +2
+3
+4
+5
+6
+7		 +4
+6
+8
+10
+12
+14		 +6
+9
+12
+15
+18
+21		 +8
+12



 +10




 1
1.5
2
2.5
3
3.5
IV 10 max 14 4     -12 -8 +4 +0 +4 +8 +12     2
V 25 max
25-50
50-75
75-100
100-125
125-150		 75
113
150
188
225
263		 50
75
100
125
150
175		         -50
-75
-100
-125
-150
-175		 0
0
0
0
0
0		 +50
+75
+100
+125
+150
+175		         25
38
50
63
75
88
VI   200 400    
A B C* D* E* F*
 
  


 
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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