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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