I. Gap in Bearing Materials
Regarding the gap in bearings and materials: Industry data indicates that the core disparities lie in material quality and performance consistency. Data from the Chinese Materials Research Society (2024) shows that the contact fatigue life of domestically produced bearing steel is 20% to 30% lower than that of advanced foreign materials.
While imported deep-groove ball bearings can achieve actual service lives exceeding eight times—or even thirty times—their calculated life ratings, domestic counterparts typically reach only three to five times. Although dimensional tolerances and rotational precision are now very close to international standards, significant gaps remain in consistency, reliability, and peak values for vibration and noise. The localization rate for bearings in high-end sectors, such as high-speed rail, is less than 30%; in 2024 alone, my country imported rolling bearings valued at US$3.519 billion and weighing 166,200 tons.
II.
Gap in Lead Screws and Guide Rails
Regarding the gap in lead screws and guide rails: Brokerage research reports highlight a clear disparity between leading domestic manufacturers and top international players.
Differences include a lag of two to three grades in lead accuracy, maximum dynamic load capacities that are approximately 30% lower, service lives that are 20% to 50% shorter, and yield rates of 60% to 70% (compared to 80% to 90% overseas). Monthly production capacity stands at 10,000 to 20,000 units, whereas overseas leaders produce over 100,000 units. The localization rate for high-end lead screws (C5 grade and above) is approximately 38.6%, while the rate for planetary roller screws is under 10%—a market largely monopolized by Swiss and German companies. Import dependency for precision functional components exceeds 80%, and domestic guide rails exhibit noticeably higher straightness errors compared to imports;
domestic high-end lead screws and guide rails are still in a catch-up phase.
III. Gap in Speed Reducers and Servo Systems
Regarding the gap in speed reducers and servo systems.
Industry analysis reveals that the localization rate for RV reducers—core components of heavy-duty robots—stands at only 25% to 35%, with the high-end market still dominated by Japan’s Nabtesco. Servo motors are concentrated in the low-to-mid-end markets, with high-end models relying on imports; top global players remain companies like Panasonic, Yaskawa, Mitsubishi, and Siemens. The Mean Time Between Failures (MTBF) for domestically produced core components is roughly one-third that of imports. Foreign brands monopolize over 90% of the CNC systems for high-end five-axis machine tools; while domestic systems support five-axis simultaneous control, they lag in precision stability and reliability, are prone to failure during continuous operation, and suffer from rapid degradation in machining accuracy—with the gap primarily lying in “invisible” soft power areas like algorithms and dynamic stability.
IV.
Progress in Domestic Substitution
Domestic substitution has advanced rapidly.
Industry data shows striking shifts in localization rates: the market share of foreign-invested enterprises in China’s precision bearing sector (P5 grade and above) dropped from 79% in 2018 to under 30% in 2025. By 2025, the localization rate of China’s industrial robot market exceeded 50% for the first time; by 2026, the overall domestic substitution rate for core components surged past 75%, with core robot component localization exceeding 85%, and repeatable positioning accuracy of ±0.05 mm proving sufficient for 90% of application scenarios. Main bearings for shield tunneling machines have successfully transitioned from 3-meter to 12-meter class applications, achieving reliability levels comparable to international counterparts, with a nearly 50% localization rate for 3-meter class bearings. Domestically produced wind power bearings offer lower prices and a failure rate just one-tenth that of foreign products.
V.
Advantages of Domestic Products and Selection Advice
Advantages of domestic components and selection recommendations.
Industry insights highlight three key advantages of domestic products: Price—generally one-third to one-half the cost of imports (with complete casting machines costing only one-third of imported equivalents); Service—while imported machines may require a two-week wait for replacement parts, domestic suppliers offer rapid two-hour responses and on-site service within 24 hours; Collaborative Development—local manufacturers are willing to accommodate custom modifications and respond quickly to specific needs.
Selection Advice: For high-precision, high-safety scenarios (such as high-speed rail, aviation, precision machine tools, and ultra-high-speed spindles), opt for imports. For the vast majority of applications—including low-to-mid-range needs where cost-effectiveness and service matter—choose domestic products.
It comes down to priorities: choose high-precision imports if budget is no object, or domestic products for better value; both approaches have their merits.
Conclusion
Regarding the gap between domestic and imported automation equipment components, the conclusion is that domestic products have surpassed imports in the low-to-mid-range market but are still catching up in the high-end sector. Specific gaps include: domestic bearing steel has 20%–30% lower fatigue life; actual bearing service life is 3–5 times (vs. 8–30 times for imports); Mean Time Between Failures (MTBF) is about one-third that of imports; ball screw service life is 20%–50% shorter; and localization rates stand at 25%–35% for RV reducers, 38.6% for C5-grade ball screws, and under 10% for planetary roller screws, with import dependency for precision functional components exceeding 80%. Progress has been made, however: the market share of foreign high-end bearings has dropped from 79% to below 30%; over 75% of core robot components are localized; main bearings for tunnel boring machines (TBMs) match international standards; and the failure rate of wind power bearings is just one-tenth that of foreign counterparts.
Domestic advantages include prices ranging from one-third to one-half of imports, two-hour service response times, and rapid collaborative development. Industry consensus suggests that while static performance metrics can match imports, dynamic stability still lags slightly—specifically regarding precision retention (imports maintain precision for 3–5 years without degradation, whereas domestic products degrade faster during continuous operation).
Ultimately, the choice depends on the application: select imports for high-precision needs and domestic products for the vast majority of applications, leveraging their superior cost-performance ratio and service support.
