777黄色视频日本,宅男色在线网站,国产无遮挡18禁网站免费,亚洲裸体XXXXX高清,中文字幕综合网

The commonly used materials for bearing shells include brass, tin bronze, aluminum bronze, and phosphorus bronze. Due to the different performance of bearing shells, the selected materials are also different. Brass is the most common copper alloy material, with low price and average wear resistance. It is a substitute product for plastic bearing shells and new base alloy bushings; Bronze material bearings are recommended for many mechanical equipment bearings because their wear resistance is much stronger than brass, and their normal use time is several times longer than brass, which effectively protects the bearing's service life.

Dongguan Sanhe Machinery [Hotline: 0769-82872718] mainly produces copper worm gears, copper sleeves, copper tiles, copper inlays, copper pulleys, copper liners, copper gears, copper castings and other products. It adopts advanced production processes such as metal mold centrifugal casting, vacuum suction casting, and gravity casting to produce various grades and specifications of copper alloy mechanical parts.
http://www.syhsg.cn