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Precision Miniature Ball Grades & Tolerances

GRADES & TOLERANCES – INCHES
AMBA
Grade
DIN
Grade
Deviation
from
Spherical
Form
Lot
Diameter
Variation
Allowable
Ball
Gauge
Variation
Nominal
Ball
Diameter
Tolerance
Marking
Increments
*Max.
Surface
Roughness
in Micro-
inches "Ra"
3 .000003 ±.000003 ±.00003 .000010 .5
5 .000005 ±.000005 ±.00005 .000010 .8
10 I .000010 ±.000010 ±.00005 .000010 1.0
25 II .000025 ±.000025 ±.00010 .000010 2.0
50 III .000050 ±.000050 ±.0002 .000050 3.0
100 IV .0001 ±.0001 ±.0005 5.0
200 .0002 ±.0002 ±.0010 8.0
500 .0005 ±.0005 ±.0025
1000 V .0010 ±.0010 ±.0050

*Maximum surface roughness is an arithmetic average.

GRADES & TOLERANCES – MILLIMETER
DIN
Grade
AMBA
Grade
Deviation from
Spherical Form
Lot Diameter
Variation
Allowable Ball
Gauge Variation
Nominal Ball
Diameter
Tolerance
Marking
Increments
*Max. surface
roughness in
micro-meters "Ra"
3 .00008 ±.00008 ±.0008 .00025 0.012
5 .00013 ±.00013 ±.0013 .00025 0.020
I 10 .00025 ±.00025 ±.0013 .00025 0.025
II 25 .0006 ±.0006 ±.0025 .00025 0.051
III 50 .0012 ±.0012 ±.0051 .00127 0.076
IV 100 .0025 ±.0025 ±.0250 0.127
200 .0050 ±.0050 ±.0381 0.203
500 .0125 ±.0125 ±.0635
V 1000 .0250 ±.0250 ±.1270

*Maximum surface roughness is an arithmetic average.