TRD Specialties, Inc.Chrome Steel Balls, 52100
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Ball Grades


Grades and Tolerances - Inches

Grade Size Range Deviation from Spherical Form Lot Diameter Variation Allowable Ball Gage Variation Nominal Ball Diameter Tolerance Marking Increments Maximum Surface Roughness* in Micro-Inches "Ra"
3 0.006-1/2 0.000003 0.00000 0.00003 - 0.000010 0.5
5 0.006-1/2 0.000005 0.00000 0.00005 - 0.000010 0.8
10 0.006-7/8 0.000010 0.000010 0.00005 - 0.000010 1.0
25 0.006-1 0.000025 0.000025 0.00010 - 0.000010 2.0
50 0.006-1 0.000050 0.000050 - 0.0002 0.000050 3.0
100 0.006-1 0.000100 0.000100 - 0.0005 - 5.0
200 0.006-1 0.000200 0.000200 - 0.0010 - 8.0
1000 0.006-1 0.001000 0.001000 - 0.0050 - -
*Maximum surface roughness arithmetic average.


Grades and Tolerances - Metric (Millimeters)

DIN Grade ABMA Grade Deviation from Spherical Form Lot Diameter Variation Allowable Ball Gage Variation Nominal Ball Diameter Tolerance Marking Increments Maximum Surface Roughness* in Micro-Inches "Ra"
- 3 0.00008 0.00008 0.0008 - 0.00025 0.012
- 5 0.00013 0.00013 0.0013 - 0.00025 0.020
I 10 0.00025 0.00025 0.0013 - 0.00025 0.025
II 25 0.00060 0.00060 0.0025 - 0.00025 0.051
III 50 0.00120 0.00120 - 0.0051 0.00127 0.076
IV 100 0.00250 0.00250 - 0.0381 - 0.127
- 200 0.00500 0.00500 - 0.0250 - 0.203
V 1000 0.02500 0.02500 - 0.1270 - -
*Maximum surface roughness arithmetic average.

 


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