Golden State Gear and Machinery Inc. (GSG) is a power transmission component manufacturer in Guangdong ; China, with major products that cover from gears and transmission products , especially spiral bevel gears for automobiles, aerospace , and machinery industries . GSG manufactures spiral bevel gears up to 1600 mm in diameter. All machining operations are performed in-house, giving GSG full control over each manufacturing stage. GSG uses full range of CNC equipment in major production process to ensure quality, flexibility. GSG also uses computer controlled in-house heat-treating to control and monitor over every manufacturing variable. GSG uses high quality equipment in its products, which includes more than 100 Gleason Hypoid gear manufacturing and testing machines. Many world famous equipment are used in production, which includes the SIP jig bore and SIP universal tool inspection machines, OKUMA CNC vertical machines centers and lathes, KAAP Hob Grinder, M&M CNC gear inspection center, etc. GSG¡¯s major products include low noise level spiral bevel gears for car , bus and trucks axles .