This is the main spindle of the milling unit for compound lathes. The material is SCM415H. After hardening, the outer diameter and inner taper (8° ER specification) parts are finished by grinding. The runout accuracy of the standalone spindle is within 2μm, measured at the taper part.
- Inner diameter grinding, outer diameter grinding, ultra-precision grinding
- Geometric tolerance assurance, concentricity, cylindricity, parallelism, roundness
- Taper grinding
- Inner diameter grinding, outer diameter grinding, precision grinding, grinding processing

High-Precision Spindles, High-Precision Shafts, High-Precision Axles
With decades of experience, we handle the main spindles and spindles of machine tools, dedicated machines, machining centers, and lathes. Processing proceeds considering heat treatment distortion. We also handle inner diameter taper grinding and outer diameter taper grinding, as well as inner diameter grinding processing after assembly.

- Rotation speed: 2000–50000 RPM
- Runout accuracy: aimed at zero, meeting drawing and customer requirements
- Outer diameter tolerance: 0.001
- Inner diameter tolerance: 0.001
- Coaxiality: 0.001
- Roundness: 0.001
- Symmetry: 0.002

Geometric Accuracy Assurance of Machine Parts
We specialize in precision opening part processing. Using machining processes such as NC lathes, M/C, and outer diameter grinding, we achieve high-precision machining of machine parts. We also handle defect inspection and painting of castings.

- Hole pitch: guaranteed 0.002 or more
- Circle pitch: guaranteed 0.002 or more
- Outer diameter tolerance: up to 0.001
- Inner diameter tolerance: up to 0.001
- Perpendicularity: 0.005 (M/C processing), 0.001 (grinding processing)
- Coaxiality: 0.001
- Surface roughness: up to 0.1z

- Can handle diagonal oil holes
- Heat treatment support: induction hardening, carburizing, vacuum hardening, nitriding, Tufftride, etc.

First-class technicians can achieve precision machining in all processes.

- Lead time: 1W–4W
- Quality assurance: inspection data submitted according to customer requirements
- Price: low cost with high quality (consultation required each time)

Contact Information:
Kitou Seiki Manufacturing Co., Ltd.
Assembly Group: Nakamura
TEL: 0565-52-3757 FAX: 0565-52-8567 Email: nakamura@kitouseiki.onmicrosoft.com