| Grade: |
The numerical value of the Diameter Tolerance per Ball expressed
in millionths of an inch |
| Diameter Tolerance per Ball: |
The permissible difference between the largest diameter and the
smallest diameter measurable on one ball |
| Diameter Tolerance per Unit Container: |
The permissible range of the average diameters of the individual
balls within any one unit container. |
| Basic Diameter: |
The size ordered which is the basis to which the basic diameter
tolerances apply. The Basic Diameter is specified by a fraction plus
a decimal or a decimal only to the sixth place, e.g. 1/4"+.0002" or
.02502", 15-64"+.0003" or .234675". |
| Basic Diameter Tolerance: |
The maximum allowable deviation of any ball diameter from the
basic diameter, in any shipments to fill orders for that basic diameter. |
| Marking Increments |
The standard unit steps in millionths of an inch used to express
the Specific Diameter. |
| Item |
Material |
Form Deviation |
Diameter Tolerance |
Hardness (Vickers) |
Density (g/cm3) |
Surface Finish |
| Ruby Ball |
Synthetic ruby AL2O3, monocrystalline |
<0.25um |
+/-.025um |
1800 |
3.9 |
0.015um |
| Hollow Ceramic Ball |
AL2O3, polycrystalline |
<0.6um |
+/-0.6um |
1650 |
3.9 |
0.1um |
| Cylinder, Stainless Steel |
Stainless Steel |
<2um |
+/-10um |
250 |
7.9 |
0.4um |
| Cylinder, Ruby |
Synthetic ruby AL2O3 |
<1um |
+/-1um |
1800 |
3.9 |
0.05um |
| Cylinder, TC |
Tungsten Carbide |
<1um |
+/-1um |
1550 |
15.0 |
0.2um |
| Ball Disc, Ceramic |
Alumina AL2O3, ceramic polycrystalline |
<0.6um |
+/-0.6um |
1650 |
3.9 |
0.1um |
| Ball Disc, Steel |
Stainless Steel |
<3um |
+/-10um |
250 |
7.9 |
0.4um |
| Disc Stylus, Steel |
Hardened Steel |
<2um |
+/-10um |
720 |
7.9 |
0.2um |
| Shank and Extension, Stainless Steel |
Stainless Steel |
- |
- |
- |
7.9 |
- |
| Shank and Extension, Ceramic |
Alumina AL2O3, ceramic polycrystalline |
- |
- |
- |
3.9 |
- |
| Shank and Extension, Carbon Fiber |
Carbon Fiber |
- |
- |
- |
1.5 |
- |
| Shank, Tungsten Carbide |
Tungsten Carbide |
- |
- |
- |
15.0 |
- |
| Extension, Alu7075 |
7075 high strength aluminum |
Hard coat anodized surface with PTFE inserts |
2.8 |
- |
