Tungsten Carbide Ball National Standard (JBT9145-1999)

Tungsten carbide ball national standard illustrates the size and technical conditions of every tolerance levels tungsten carbide ball, which is widely used in instrument probe, special bearings and some other tungsten carbide ball manufacturing and tests. There are some defined terms, symbols and explained as follows:

1. Nominal diameter of the ball Dw

2. Single diameter of the ball Dw_s

3. The average diameter of the ball Dw_m

4. The diameter variation of ball V_Dws

5. Spherical error△S_pu

6. Batch L（Lot）

7. The average diameter of the batch D_Wml

8. The diameter variation of the batch V_Dwl

9. Tolerance level of the ball

10. The deviation of the batch average diameter: The D-value between the average diameter of the batch and nominal diameter.














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