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Standards & Tolerances ISO 3290 - 1998 DIN 5401 - PART I SIZE & GRADE
Values in Micron

STANDARDS & TOLERANCES  ( ISO 3290 - 1998 )
Grade Variation of
ball diameter
VDws Max.		 Deviation
from spherical
form tDw Max.		 Surface
roughness
Ra Max.		 Lot diameter
Variation
VDwL Max.		 Gauge
Interval
IG		 Preferred
gauges 		Subgauge
Interval		 Subgauges
G3  0.08 0.08 0.010 0.10 0.5 -5,..-0.5 0,+0.5,...+5 0.1 -0.2 - 0.1 0, + 0.1+ 0.2
G 5  0.13 0.13 0.014 0.25 1 -5,.. -1, 0,+1,...+5 0.2 -0.4 - 0.2 0, + 0.2+ 0.4
G 10  0.25 0.25 0.020 0.5   1 -9,.. -1, 0,+1,...+9 0.2 -0.4 - 0.2 0, + 0.2+ 0.4
G 16 0.4  0.4  0.025 0.8   2 -10,..-2, 0,+2,...+10 0.4 -0.8 - 0.4

0, + 0.4+ 0.8
G 20 0.5  0.5  0.032 1      2 -10,..-2, 0,+2,...+10 0.4 -0.8 - 0.4 0, + 0.4+ 0.8
G 24 0.6  0.6  0.040 1.2   2 12,..-2, 0,+2,...+12      
G 28 0.7  0.7  0.050 1.4   2 -12,..-2, 0,+2,...+12 0.4 -0.8 - 0.4 0, +0.4+ 0.8
G 40 1     1     0.060 2     4 -16,..-4, 0,+4,...+16 0.8 -1.6 - 0.8 0, + 0.8+1.6
G 60 1.5 1.5  0.080 3     6 -18,..-6, 0,+6,...+18 1.2 -2.4 - 1.2 0, +1.2+2.4
G100 2.5 2.5  0.100 5     10 -40,..-10, 0,+10,...+40 2   -4 -2 0, +2, +4
G 200 5    5     0.150 10      15 -60,..-15, 0,+15,...+60 3   -6 -3 0, +3, +6
G 500*  12.5 12.5      25                 
G 1000*  25   25        50                 
According to AFBMA Standards