Sanluo Precision is a specialized manufacturer and supplier in China, dedicated to providing custom accurate machining services. The company is equipped with a comprehensive array of production machinery and complete process capabilities, enabling it to meet the manufacturing requirements for a wide variety of precision parts—ranging from precision turning, milling, and grinding to specialized machining operations. We specialize in the custom production of complex and challenging parts. Accurate machining demands excellence in every single link of the process; consequently, we strive for absolute rigor in every step—from design review, process planning, equipment selection, and tooling configuration to actual machining execution and quality inspection.
Precision machining is not merely a technical matter; it is, fundamentally, a matter of management and manufacturing philosophy. With extensive machining experience, the company has established a robust quality management system—certified under ISO 9001:2015—and leverages advanced inspection instrumentation and engineering expertise to provide clients with consistent and reliable custom accurate machining services.
Precision turning is a highly accurate machining process that achieves material removal through the rotation of the workpiece combined with the linear feed of the cutting tool. It can achieve dimensional tolerances as tight as ±0.002mm, surface roughness levels of Ra0.4μm, and coaxiality controlled within 0.003mm. Our capabilities encompass standard precision turning, hard turning, micron-level turning, and turn-milling operations, allowing us to fulfill one-stop machining requirements for everything from high-precision shafts and rotational components to complex structural parts.
Sanluo Precision specializes in manufacturing services for precision turned parts, precision machined components, precision CNC parts, and precision machining products. We possess a full suite of ultra-precision equipment—including CNC milling, turning, grinding, and electrical discharge machining (EDM) systems—and integrate traditional ultra-precision cutting, grinding, specialized machining, and compound machining technologies. This enables us to achieve dimensional tolerances at the 0.0005mm level and surface finishes at the Ra0.01μm level. We work with a diverse range of materials, including aluminum alloys, stainless steels, titanium alloys, engineering plastics, and ceramics. Furthermore, we maintain a complete manufacturing ecosystem—spanning R&D prototyping, mass production, surface treatments, full-dimensional inspection, and comprehensive visual inspection—and rely on our professional engineering team and rigorous quality control protocols to provide clients with both standardized and customized high-precision, high-stability machining services.
As a professional manufacturer and supplier of machined parts, strictly adhering to the dimensional accuracy and geometric tolerances specified in customer drawings is our primary and fundamental requirement. At Sanluo Precision, our machining accuracy is controlled within a dimensional tolerance range of ±0.0005 to ±0.002 mm (total tolerance band of 0.001 to 0.004 mm). Geometric tolerances—including roundness, cylindricity, flatness, straightness, perpendicularity, and parallelism—are generally controlled within 0.001 to 0.003 mm. Our fit accuracy ranges from 0.002 to 0.004 mm, with a surface roughness of Ra 0.05 to 0.2 μm, thereby meeting the requirements for high-precision fits and assemblies. During mass production, dimensional deviations for machined parts are typically controlled within ±0.005 mm; our Process Capability Index (Cpk) consistently exceeds 1.67, and batch-to-batch variations remain under 0.003 mm, achieving a level of high-precision machining that approaches 6-sigma standards.
How can complex, precision parts be successfully machined if one relies solely on a single process and lacks comprehensive, system-wide process capabilities? Sanluo Precision possesses extensive expertise in precision turning, milling, grinding, and specialized machining processes. For precision turning, we are equipped with CNC lathes featuring electric spindles, high-speed turning centers, and Swiss-type automatic lathes. We machine shaft-type and sleeve-type parts ranging in diameter from φ0.1 to 100 mm, achieving a dimensional accuracy of ±0.001 mm, a roundness of approximately 0.002 mm, a concentricity of approximately 0.002 mm, and a surface roughness of Ra 0.1 μm. For precision milling, we utilize machining centers and 5-axis simultaneous machining equipment with travel ranges of 150 to 300 mm; this allows us to achieve a flatness of up to 0.002 mm and a surface roughness of Ra 0.1 μm, making it ideal for machining complex cavities and precision planar surfaces.
For precision grinding, we employ external cylindrical grinders, internal cylindrical grinders, surface grinders, and jig grinders to control critical dimensions within ±0.001 mm, achieving a roundness of approximately 0.001 mm, a flatness of approximately 0.001 mm, and a surface roughness of Ra 0.1 μm. By integrating deep-hole drills, gun drills, and laser drills—capable of achieving a positional accuracy of 0.002/100mm and a depth-to-diameter ratio of ≥20—alongside slow-feed wire-cut EDM (featuring an accuracy of 0.001mm and a surface roughness of Ra 0.2μm), we are able to execute complex, multi-station machining processes for intricate parts.
By combining comprehensive, end-to-end quality control with a precision inspection environment maintained under constant temperature conditions. Without a traceable quality management system and a precisely controlled machining environment, even the most advanced equipment cannot fully meet the demands of high-precision parts manufacturing.
At Sanluo Precision, we place quality management at the very core of our accurate machining process. During the preliminary stages, we utilize DFM (Design for Manufacturability) analysis and process optimization to select the optimal cutting tools and parameters; furthermore, we conduct First Article Inspection (FAI) to validate the rationality of our chosen processes. During the production phase, we employ SPC (Statistical Process Control), real-time CPK calculations, and X-R control charts to perform trend analysis, execute preventive adjustments, and ensure the timely traceability of any potential issues. Our inspection infrastructure is equipped with automated CMMs (Coordinate Measuring Machines) accurate to 0.001mm, vision measuring systems accurate to 0.002mm, roundness testers accurate to 0.0005mm, and surface roughness testers with a resolution of 0.01μm; alongside hardness testers, spectrometers, and other instruments, this comprehensive suite ensures controlled quality throughout the entire lifecycle—from raw materials to finished products. Our temperature-controlled workshop is maintained at a constant 20±1°C, with humidity at 50±5% and a cleanliness rating of Class 10,000; this environment effectively minimizes thermal deformation and environmental interference, thereby providing a stable and precise foundation for both accurate machining and precision CNC machining operations.
By specializing in the high-end, precision machining of parts across a diverse range of industries. The accurate machining components we deliver have successfully been integrated into high-end applications within the aerospace, medical device, precision instrumentation, and optical-electronic communications sectors. Sanluo Precision’s custom precision machining services span a wide range of industries. For aerospace structural components—manufactured according to blueprints using titanium and nickel-based alloys—our 5-axis machining achieves dimensional tolerances of ±0.003 mm and a surface roughness of Ra ≤ 0.2 μm.
For structural parts utilizing lightweight 7075 aluminum alloy designs, machining precision reaches approximately ±0.002 mm. Furthermore, for precision instruments, fixtures, and jigs, we maintain a standard hole position tolerance of 0.005 mm, a flatness of 0.002 mm, and a surface roughness of Ra 0.2 μm. We consistently employ inspection methods that exceed the requirements specified in our clients' blueprints to ensure the stability and reliability of our measurement results.
In the medical device sector, we produce complex surgical instruments that are sharp, durable, and feature smooth surfaces; when combined with sterile packaging, these products meet the highest standards of safety and regulatory compliance. For industrial precision components—such as pistons, connecting rods, and camshafts—we achieve a dimensional tolerance of ±0.002 mm and a surface roughness of Ra 0.1. Our precision gears feature a tooth profile accuracy of Grade 6 and undergo surface hardening treatments, thereby satisfying our clients' requirements for low noise and extended product lifespan.
Sanluo Precision has provided custom precision machining services to leading enterprises such as Huawei, BYD, and Mindray Medical. With an annual output of tens of thousands of precision parts—characterized by micron-level accuracy, consistent quality, and professional service—we have established ourselves as a trusted manufacturing partner for clients worldwide.
