Grade Chart

Grade Sphericity Ø nominal Ø variation Surface roughness Ra
501.25 um+/- 15 um+/- 1.25 um20 nm
251.63 um+/- 2.5 um+/- 0.7 um10 nm
100.25 um+/- 2.5 um+/- 0.25 um10 nm
60.16 um+/- 2.5 um+/- 0.16 um8 nm
5 **0.13 um+/- 1 um+/- 0.13 um8 nm
3 **0.07 um+/- 1 um+/- 0.07 um7 nm

** SUBJECT TO STOCK AVAILABILITY

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Increments, odd sizes, ...