Sanluo Precision is a leading Chinese manufacturer and supplier of high-precision machining services, dedicated to providing global clients with ultra-high-precision customization solutions. We specialize in the custom manufacturing of complex and challenging components. The company operates a 1,500 m² ultra-precision machining workshop featuring constant temperature and humidity control (maintained at 20±0.5°C and 55±3% relative humidity) within a Class 1000 cleanroom environment. This facility is equipped with over 20 pieces of ultra-precision machinery, including Japanese FANUC ultra-precision machining centers, German KERN 5-axis micro-machining centers, and Japanese Mitutoyo ultra-precision measuring machines. We also possess a comprehensive suite of precision inspection instruments, such as CMMs (Coordinate Measuring Machines), contour measuring instruments, and interferometers.
As a high-end provider of precision machining services, we understand that true "high precision" entails more than just machining capability; it requires meeting rigorous standards across equipment, processes, environmental controls, and personnel to ensure that every single specification outlined in the client's technical drawings is fully satisfied.
High precision machining represents a form of "extreme manufacturing" that integrates a diverse array of ultra-precision processes to achieve dimensional accuracies ranging from the micron down to the sub-nanometer scale. It is widely applied in high-end sectors such as optics and optoelectronics, aerospace, semiconductors, and life sciences. Our capabilities encompass a broad spectrum of technologies, including ultra-precision CNC turning, CNC milling, 5-axis simultaneous machining, single-point diamond turning (SPDT), fast/slow tool servo machining, precision grinding, EDM (Electrical Discharge Machining), wire cutting, and laser processing. While standard precision equipment can achieve dimensional tolerances of ±0.001 mm and surface roughness values of Ra 0.2 μm, our ultra-high-precision and extreme-precision machining capabilities enable dimensional control ranging from 0.0005 mm down to the nanometer level, yielding surface finishes with roughness values below Ra 0.01 nm. This comprehensive manufacturing system covers the entire spectrum of precision requirements—from standard precision and tight tolerances to high-tolerance applications (IT6 grade and above), culminating in ultra-high-precision and extreme-precision manufacturing.
Sanluo Precision specializes in high-precision CNC machining, super-precision turning, high-tolerance machining, ultra-high-precision machining, and extreme-precision machining. We strictly control equipment accuracy and maintain a constant-temperature, dust-free, and vibration-isolated processing environment. Supported by a professional technical team, we manage material selection, process planning, manufacturing optimization, programming, and end-to-end quality control. We reliably provide turning, milling, grinding, electrical discharge machining (EDM), and hybrid machining services with precision tolerances of ±0.001mm—reaching super-precision levels down to the nanometer scale. Our services are widely applied in high-precision bearings, optical components, semiconductor-related parts, precision molds, micro-structures, and high-end equipment components. We also support customized development, meeting our clients' most demanding requirements for extreme precision, batch stability, and technological breakthroughs.
As a specialized high precision machining facility, we adhere to a processing philosophy that demands the highest standards. Even if product blueprints do not explicitly specify them, the top priorities requiring precise control during machining are geometric tolerances (form and position) and surface quality; only upon this foundation can we ultimately control the part's dimensional tolerances and meet overall requirements. At Sanluo Precision, the dimensional tolerances of our machined parts can reach IT1–IT6 grades (approximately ±0.001mm to ±0.002mm). Geometric tolerances—including roundness, cylindricity, flatness, straightness, perpendicularity, parallelism, and concentricity—are controlled within a range of 0.001mm to 0.005mm. Positional tolerances—such as true position, symmetry, and runout—are maintained within approximately ±0.002mm to ±0.005mm. Surface roughness can be achieved within the range of Ra 0.05μm to 0.2μm, with mirror-finish grades reaching Ra 0.02μm to 0.1μm, fully satisfying the micron-level requirements of high-precision and precision CNC machining applications. In batch production, dimensional deviations are controlled within ±0.002mm, achieving a CPK value of ≥2.0 and a defect rate of less than 3.4 PPM.
Without the support of ultra-precision equipment and a stable, controllable processing environment, so-called "high-precision machining" would be entirely impossible to achieve. Sanluo Precision is equipped with precision 5-axis machining centers featuring a positioning accuracy of approximately ±0.001 mm and a repeatability of approximately ±0.0005 mm, fully supporting RTCP functionality. Our ultra-precision CNC lathes boast a spindle runout of less than 0.001 mm and a positioning accuracy of approximately ±0.0005 mm. Our ultra-precision grinding machines achieve an accuracy level of IT5, with a roundness of approximately 0.001 mm. Our jig grinding machines feature a 3-axis positioning accuracy of approximately ±0.001 mm and a hole-position accuracy of approximately ±0.002 mm. Furthermore, our slow-feed wire-cut EDM machines achieve a cutting accuracy of approximately ±0.002 mm and a surface roughness of Ra 0.2 μm. Operating within an ultra-precision workshop environment characterized by constant temperature, controlled humidity, and minimal vibration, we establish a foundation of long-term, stable processing conditions essential for both high-precision and accurate machining.
Possessing high-end equipment alone—without the accompanying sophisticated processes and robust inspection systems—renders even the highest nominal machine specifications ineffective in actual production scenarios. In terms of process methodology, Sanluo Precision implements a "Pre-treatment + Multi-stage Finish Machining" strategy: Workpieces undergo thermal treatment followed by multiple aging cycles to relieve internal stresses and ensure uniform hardness (with HRC fluctuations controlled within ±1). During the pre-machining stage, a precise finishing allowance of 0.05 to 0.15 mm per side is reserved. The machining process proceeds through multiple stages—roughing, semi-finishing, finishing, and ultra-finishing—wherein the cutting depth per side is progressively reduced to less than 0.002 mm. This is coupled with micro-cutting parameters—depths of 0.005 to 0.05 mm, feed rates of 0.01 to 0.08 mm/rev, and spindle speeds of 1000 to 5000 rpm—to ensure the consistent integrity of both dimensional accuracy and surface quality.
Cutting tools utilized are imported ultra-hard tools featuring PVD nano-coatings, with a tool pre-setting accuracy of approximately ±0.001 mm and a tool-setting accuracy of approximately ±0.0005 mm. During the inspection phase, we employ a suite of advanced instruments—including laser interferometers for machine tool calibration (with an accuracy of approximately 0.1 μm), Coordinate Measuring Machines (CMM) with a measurement accuracy of about 0.002 mm, roundness testers accurate to approximately 0.0005 mm, and white-light interferometers capable of achieving a surface resolution of up to 0.1 nm. This comprehensive approach establishes a closed-loop control system, ensuring that quality data for our high precision machining operations remains stable and controllable, while rendering the degree of precision compliance completely predictable.
As a manufacturer and supplier of high-precision machined parts, our components have successfully penetrated cutting-edge sectors such as aerospace, medical devices, and semiconductor equipment. Sanluo Precision’s high-precision machining capabilities are now widely applied across these fields: In aerospace structures, main shafts—fabricated from titanium and nickel-based alloys—feature an outer roundness of approximately 0.002 mm, a runout of about 0.002 mm, a surface roughness of Ra 0.4 μm, and a dynamic balance rating reaching Class G0.4. Components for inertial gyroscopes exhibit a sphericity of approximately 0.001 mm and a surface roughness of Ra 0.05 μm. In the realm of optics and precision instrumentation, optical spindles demonstrate a runout of approximately 0.002 mm, an end-face perpendicularity of about 0.003 mm, and a surface roughness of Ra 0.2 μm. Within the medical device sector, the spherical heads of artificial joints—crafted from cobalt-chrome alloys—feature a sphericity of approximately 0.005 mm and a surface roughness of Ra 0.1 μm, boasting a fatigue life exceeding 20 million cycles; meanwhile, titanium alloy components for spinal internal fixation achieve a precision tolerance of approximately ±0.002 mm.
Finally, in the semiconductor equipment industry, our wafer chucks achieve a flatness of approximately 0.001 mm and a positional accuracy of about ±0.002 mm, while our precision guide rails maintain a straightness of approximately 0.002 mm per 300 mm and a surface roughness of Ra 0.1 μm—thereby guaranteeing the operational precision of the equipment. Through the sophisticated integration of micro-CNC machining and precision CNC machining, Sanluo Precision provides clients with one-stop, customized high precision machining solutions—ranging from micron-scale structures to complex components. Producing tens of thousands of high-precision parts annually, the company has earned the trust of clients worldwide, establishing itself as a reliable manufacturer and supplier of high-precision machining services through its consistent micron-level accuracy and comprehensive service.
