JZY SUS400 Series Stainless Steel Hardened Shafts Features:

1.SUS400 series stainless steel for whole shaft.
  -- No chromeplating, much durable.
2.Quench on shaft's surface.
  -- Hardness: HRC56-58.
3.Residual stress- eliminating process.
  --Precise straightness accuracy, much stable.
4.Roughness: similar to mirror.
  --Bearings run much smoothly.

Production range: 
 -Diameter: 3mm - 30mm
 -Length: 3000mm or less

Product standard & accuracy (CUSTOMIZED RANGE):

  Diameter Tolerance (mm): +0.005 ~ 0 or 0 ~ -0.005
  Ovality (mm): +0.001 ~ 0 or 0 ~ -0.001
  Surface Roughness: 0.05, similar to mirror
  Straightness (mm): 0.02mm/meter
  Surface Hardness: HRC56-58
  Hardening Depth: 10%-20% of diameter(mm)

Excelent equipmets depend on components good quality & high stability. 
JZY shafts are your best choice!