In 2011, the four leading industries in Henan Province maintained a good momentum of development.

In 2011, under the strong promotion of the new energy automobile industry in Henan Province, 21 new energy vehicles were announced by the state and demonstrated in more than 30 cities across the country. Nearly 2,000 demonstration vehicles of various electric vehicles in the province, Zhengzhou, The large charge (changing) power station in Xinxiang and Xuchang has been completed and used. The development of new energy and new materials industry is good. The companies such as AVIC Lithium, Cologne Group, Huajing Diamond and Xinda New Materials have grown rapidly, forming a group of leading enterprises with strong competitiveness. The bio-pharmaceutical industry was stimulated by the national new medical reform policy and driven by the rigid demand of the market, showing a rapid growth trend. The industry's main business income increased by 40.9%.

Slotted Screws

Commonly used socket head cap Screws are: cylindrical head hexagon socket (also known as cup head), pan head hexagon socket screws (also known as round cup, half round head hexagon socket), countersunk head hexagon socket screws (also known as flat head hexagon socket, flat cup), flower hexagon socket (also known as plum slot hexagon socket)

1. Application: Hexagon socket screws, hexagon socket screws are a kind of hole screws, generally used in machine tools and equipment, chemical equipment, water pumps, ships, power equipment, electronics, electrical appliances, furniture and Other fields, mainly to facilitate fastening, disassembly, not easy to slip the corner and other advantages. Hexagon socket screws need to use the corresponding specifications of the hexagon wrench to load and unload.

2. Reference standard.
Cylindrical head hexagon socket: GB70, DIN912, ISO4762, ANSI/ASME B18.3
Hexagon socket with pan head: ISO7380
Countersunk hexagonal head: DIN7991
Hexagon socket with flower-shaped pan head: flower-shaped pan head (GB2672), flower-shaped cylindrical head (GB6190), flower-shaped countersunk head (GB2673)

Slotted Cheese Head Screw ,Slotted Head Screw ,Slotted Pan Head Screw ,Round Head Wood Screw

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