Shaft components are among the key elements that determine the performance and durability of motors. Because motors used in automobiles, motorcycles, and home appliances operate at high rotational speeds, the shaft’s surface roughness and roundness have a direct impact on overall product performance. However, achieving such high precision while maintaining low costs in mass production remains a significant challenge.

To address these challenges, Nano Seimitsu supplies motor shaft components manufactured by its group company, Fortune Cross. Fortune Cross specializes in precision polishing for high-volume production and delivers a stable supply of shaft components—primarily for automotive applications—with a monthly production capacity exceeding 15 million units.

Shaft components manufactured by Fortune Cross are used in the following types of motor applications, including:
• Automotive Motors (e.g., power window motors)
• Motorcycle Motors
• Air Conditioning Motors
• Home Appliance Motors
• Small Precision Motors

Fortune Cross operates a production system centered on precision polishing. This allows the company to consistently deliver the level of quality required for these applications.

▲ Fortune Cross Factory Overview

Shaft Manufacturing Specialized in Precision Grinding

In shaft component machining, many manufacturers rely primarily on cutting processes such as turning. However, relatively few companies are capable of supporting high-volume production that incorporates precision grinding processes. Fortune Cross has built a production system centered on polishing technologies. The factory is equipped with the following polishing facilities:


【Equipment Overview】
• Centerless Polishing Machines: Approximately 50 units
• Cylindrical Grinding Machines: Approximately 10 units
• 100% Dimensional-Inspection Systems
・• In-Process Trend Management System (LINE QC SPECIALIST）

With this equipment configuration, the entire factory operates production lines centered on polishing processes, enabling the mass production of high-precision shafts.

▲ Centerless Grinding Machine Area

Mass Production Capability Supporting 15 Million Shafts per Month

Fortune Cross’s greatest strength lies in its mass-production capability for shaft components.

【Production Capacity】
• Monthly Output: Over 15 million shafts
• Size Range: From less than Ø1 mm to approximately 1 meter, supporting both micro shafts and long shafts
• Lot Size:
o Small Components: 100,000 – 1,000,000 pieces per lot
o Large Components: Approximately 5–10 million per month

Although the factory is primarily designed as a high-volume mass production facility, consultation for smaller production volumes is also available depending on project requirements.

Although the unit price of these shafts is extremely low—around 10 yen per piece—maintaining a stable supply requires a well-balanced combination of equipment capacity, skilled personnel, and robust quality control systems. In mass-production projects that often reach several million pieces per month, the ability to sustain continuous supply itself becomes a key competitive advantage.

▲ Grinding Process

▲ Rotary Grinding Machine for End-Face Polishing of Shaft Components

Capability to Handle Both Small-Diameter and Long Shaft Components

Fortune Cross supports the machining of shaft components across a wide range of size. In particular, long shafts tend to bend during machining, making straightening operations and precision control more complex. Because of these challenges, many machining companies tend to avoid this type of production. However, Fortune Cross is capable of handling long-shaft machining and has been receiving an increasing number of high-difficulty mass-production projects, including cases where shaft production is being transferred from China to Thailand

▲ Long Shaft Straightening Process

【Processing Capability】
• Diameter Range: Ø 0.6 mm – 30 mm
• Length Range: 2.5 mm – 1,000 mm
• Outer Diameter Accuracy: 4–6 μm (typical)
• Surface Roughness: Ry ≤ 0.3 μm

Quality Assurance through 100% Inspection and Process Control

In mass-production machining, maintaining consistent quality is essential. At Fortune Cross, mass-produced components destined for overseas markets are managed under a quality control system based on 100%-dimensional inspection.

【Quality Management System】
• Dimensional Inspection: 100% inspection using automated measuring systems
• Appearance Inspection: Combination of automated inspection machines and visual inspection
• Process Monitoring: Real-time trend monitoring using LINE QC
• Pre-Shipment Inspection: Quality assurance conducted on a lot-by-lot basis

In processes where full automation remains difficult, manual inspection is incorporated as a complementary measure to maintain product quality. By striking the right balance between automated equipment and human expertise, an effective and practical quality control system can be achieved.

▲ Automated Sorting Machine

▲ Stable, High-Quality Supply through Automated and Visual Inspection

Proposals Only a Company with a Manufacturing Site Can Offer

Nano Seimitsu’s strength lies in the fact that we are not merely a trading company—we also have manufacturing operations within our own group. At our group company Fortune Cross, mass-production machining is carried out at our in-house factory. As a result, we ourselves encounter the day-to-day challenges of manufacturing sites and the complexities of quality control.

In addition, the inspection equipment and automation systems we provide are continuously refined through verification at our own production sites. By testing them in real manufacturing environments, we promote practical improvement activities that integrate manufacturing, inspection, and automation.

For motor components used in automobiles, motorcycles, and home appliances, maintaining stable quality and ensuring a reliable long-term supply are essential. Nano Seimitsu works closely with its group company, Fortune Cross, to provide integrated support—from the manufacturing of shaft components to their stable supply.

✓ Mass production supply of motor shaft components
✓ High-precision machining, including long shaft processing
✓ Integrated production from cutting to polishing
✓ Mass production system established in Thailand

If you have any questions or inquiries regarding straight pins or precision-ground shafts in Thailand, please feel free to contact us.