Grade Class 12.9 Black Oxide Cadmium Plated Cross Recessed Round Head Wood Tapping Screw

Grade Class 12.9 Black Oxide Cadmium Plated Cross Recessed Round Head Wood Tapping Screw

1,Description:12.9级

The tail of the screw is generally shown as the shape of drilling tail, the hardness of this screw is very strong, compared with ordinary screws, not only the ability to maintain better, the effect of connecting the object is very firm, for this performance of the screw, generally do not need auxiliary processing, you can directly drill a hole on the object directly to lock the object, not only very convenient to use, It can also greatly improve the efficiency of work. This kind of drilling screw can be said to be the first choice of staff in various fields.

The main purpose is to make industrial products composed of a fixed body, in the use of teeth and teeth often can not be close, too hard to lock the screw head is broken, or poor dental lock is not tight and failed to meet the conditions of use, are precision problems. Screws are "quantity products", not hand-made artworks, in mass production, in order to achieve high precision and stable quality and popular price supply to consumers for the purpose. The accuracy of the screws is usually 6g (Class 2, the US specification "IFI" is 2A teeth), and the rough screws used in construction projects are 8g (Class 3, "IFI" is 1A teeth).

3,Specifications:

4,Feature Advantage:

Reaching grade 12.9 requires smelting processes rather than steel standards. 1.8.8 grade bolts: Generally, medium carbon steel or alloy steel is used, such as No. 45 steel or 40Cr steel. Bolts of this grade have undergone heat treatment and possess excellent mechanical properties. 2. 10.9 grade bolts: Alloy structural steels such as 40Cr or 42CrMo steel are mostly used. They are generally quenched and tempered to enhance their strength and toughness. 3. 12.9 grade bolts: Alloy steel is usually selected, such as 34CrMo4 or 42CrMo, etc. This type of bolt undergoes strict heat treatment to meet the requirement of high strength

5,About us

6.FAQ

Hunan Jiashan Hardware Tech as a branch company of J AND R METALWORK,established in 2007 and located in Changsha, Hunan, China.After almost 17 years management development and technical improvement, Jiashan is willing to be a leading supplier in hardware industry. Meanwhile, we are one of member of Hardware industrial Association and Green energy industry Association.

Jiashan is specialized in milling,turning,lathe 5 axis cnc machining parts,injection molding parts,alumium extrusion parts,laser cutting parts,sheet metal fabrication parts,wire edm parts,vacuum casting parts and fasteners.Those parts are widely service for electric vehicle,solar system,wind power system and construction machinery industry.

During17 years domestic and abroad market investigation, Jiashan's products are sold to many countries and regions including the North America, Europe, Australia, the Middle East and Asia. With owned the advanced cnc machinee, milling machine, polishing machine, stamping machine etc. Jiashan is able to degsin and produce varies OEM parts with drawings or samples provided. Further more, Jiashan also can help to provide a whole solution for modularity R&D of electric vehicle and solar system .

By constantly strengthening our management and consummate the quality guarantee system.In 2023, Jiashan acquired ISO9001:2008 quality certification. Currently,the 5S management mode is implemented in the whole Jiashan system.

Best quality and best service is and will be always our toppest concern.