II. Product Features
(I) High-precision processing
Adopting advanced CNC processing technology, the shape and position tolerances such as cylindricity and coaxiality are controlled within a very small range, and the inner diameter and outer diameter dimensional accuracy reaches the micron level, ensuring perfect fit with optical components, ensuring the stability of the optical path, and reducing optical deviation.
(II) Strong stability material
Aviation-grade alloy materials are selected, which have the characteristics of high strength and low expansion coefficient. Under environmental changes such as temperature and humidity, the structure is stable and does not deform, providing continuous and reliable physical support for the optical system and adapting to complex working conditions.
(III) Low optical interference design

The surface is matte treated and specially coated to effectively reduce the reflectivity, reduce the interference of stray light on the optical path, optimize the optical environment, help obtain high-purity imaging effects, and improve the optical performance of the equipment.

Features	Parameters/Description
Processing accuracy	Cylindricity ≤ 0.002mm, dimensional tolerance ± 0.001mm
Material	Aviation-grade alloy (such as aluminum-magnesium alloy, titanium alloy optional)
Surface treatment	Matte oxidation/anti-reflective coating, reflectivity ≤ 3%

3. Product Details
From the source of research and development, we deeply analyze the stringent requirements of optical equipment for core accessories, and jointly develop metal cylindrical structures with optical design experts and mechanical engineering teams. In the processing process, relying on the high-precision five-axis linkage machining center and equipped with diamond tools, the metal blanks are milled, turned, ground and other processes, and the size and surface quality are monitored in real time at each step.

After the processing is completed, it enters the strict quality inspection link, using laser interferometer to detect the shape and position tolerances, and the optical performance of the surface coating is verified by the spectrometer. In high-end optical testing equipment, it serves as the internal bearing sleeve of the lens to ensure that multiple groups of lenses are coaxial and confocal to achieve ultra-clear imaging; in medical endoscopes, it stabilizes the transmission light path to help doctors clearly observe the tissues in the body. With its high precision, strong stability and low interference characteristics, this accessory has become a key support for the performance upgrade of optical precision equipment, and escorts precise operations in the optical field.