High-Precision Ground
Roller Shafts

A precision roller shaft is the central shaft of a roller assembly — it either drives the roller or is driven by it. Precision roller shafts are ground to tight OD tolerances (h4/h5) and high hardness (HRC 60+) to maintain dimensional accuracy under the high Hertzian contact pressures of roller applications, and to achieve the surface finish (Ra 0.1 µm) required for consistent nip pressure and smooth web handling.

Roller shafts that run in contact with roller bearings or that serve as the roller surface directly need HRC 58–62 — below HRC 58, the roller contact surface will dent under Hertzian load, causing vibration and surface marks on the web or material being processed. For precision printing and laminating roller shafts, HRC 60 with Ra 0.1 µm is the standard — achieved by case hardening (induction or through-carburizing) and precision cylindrical grinding.

h5 for roller shafts running in matched roller bearings — tight enough to eliminate clearance variation that would cause roller oscillation. h4 for ultra-precision printing rollers where shaft-to-bearing clearance must be below 0.003 mm. h6 for general conveyor roller shafts where precision is less critical. Specify the tolerance class and required roundness on your drawing.

Yes — HXC regularly machines roller shafts with integrated keyways, splines, gear teeth, or polygon (Torx) ends for direct drive without separate couplings. All drive features are machined in one 5-axis setup, ensuring concentricity between the roller surface and the drive interface within 0.003 mm — critical for vibration-free high-speed roller operation.

Prototype (1–5 pcs, hardened + mirror ground): 5–8 days. Small batch (10–50 pcs): 8–14 days. Production (100–1,000 pcs): 12–18 days. Stainless or titanium: add 2–4 days. Chrome plating adds 3–5 days. Rush production available.

42CrMo4 (induction hardened) for printing and laminating rollers. 20CrMnTi (through-carburized) for feed rollers requiring maximum surface fatigue life. SUS440C (hardenable stainless) for food and pharma rollers needing both corrosion resistance and HRC 56–58. SUS303/316L for non-hardened stainless rollers. Al 7075 hard-anodized for lightweight office and copier rollers. Ti Grade 5 for aerospace.

Standard ground OD: Ra 0.4 µm. Precision bearing journals: Ra 0.2 µm. Mirror finish for the roller contact surface: Ra 0.1 µm (super-ground). Lapped or chrome-polished finish: Ra 0.05 µm for ultra-precision printing applications. All measured by contact profilometer and reported on the inspection certificate.

Yes — keyways, splines, threads, cross-holes, flats, and tapers are all machined in the same 5-axis turning-milling setup, ensuring concentricity between all features within 0.003 mm TIR.

Maximum roller shaft length between centres: 1,500 mm. For shafts over 600 mm, straightness correction after heat treatment is performed before final grinding to keep TIR ≤ 0.01 mm/m. Specify the required straightness tolerance on your drawing — wide-format printing and laminating rollers often need ≤ 0.005 mm/m.