Jewel Bearings

 

Properties of Synthetic Sapphire and Ruby
 
QUALITY CONTROL
A.F.B.M.A. GRADE TOLERANCES AND TERMINOLOGY
A.F.B.M.A
Grade
Diameter
Tolerance
per Ball
Sphericity
Diameter
Tolerance
per
Unit Container
Basic
Diameter
Tolerance
Marking
Increments
 
Inch
Inch
Inch
Inch
3
.000003
.000005
.00003
.000003
5
.000005
.00001
.00005
.000005
10
.000010
.00002
.0001
.000010
15
.000015
.00003
.0001
.000015
25
.000025
.00005
.0001
.000025
50
.00005
.0001
.0002
.00005
100
.0001
.0002
.0005
.0001
200
.0002
.0004
.0010
.0002

 

 
 
STANDARD STOCK SIZES FOR INDUSTRIAL APPLICATIONS
  Sapphire and Ruby Glass Ceramic-A99
  Inch
mm
Inch
mm
Inch
mm
  .005
1.00
1.50
0.15
3/64"
1/16"
0.20
1.20
0.25
1.25
2.00
0.30
1.50
3/32"
0.40
1/16"
2.50
0.50-
1.00
1.75
3.00
  3/64"
2.00
1/8"
1.20
3/32"
3.50
1.25
2.50
1.50
3.00
5/32"
  1/16"
1/8"
4.00
1.75
3.50
4.50
2.00
5/32"
3/16"
  3/32"
4.50
5.00
2.50
3/16"
7/32"
3.00
5.00
  1/8"
7/32"
6.00
3.50
6.00
1/4"
  5/32"
1/4"
6.50
4.00
6.50
7.00
4.50
7.00
5/16"
  3/16"
9/32"
8.00
5.00
7.50
11/32"
  7/32"
5/16"
9.00
  6.00   8.00   9.50
  1/4"     8.50 3/8"  
  6.50 11/32"     10.00
  7.00   9.00   11.00
  9/32"     9.50 7/16"  
  7.50 3/8"     12.00
  5/16"     10.00 1/2"  
  8.00   11.00   13.00
  8.50 7/16"     14.00
  9.00   12.00 9/16"  
  9.50 1/2"     15.00
  3/8"       5/8"  
  10.00       16.00
  11.00       17.00
  7/16"         18.00
12.00
19.00
  1/2"
3/4"
20.00
          25.00
        1"  
          30.00
        1.25"  

 


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