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Carbon Steel Grade 12.9 Black CSK Countersunk Head Self Tapping Drywall Screw
1,Description:
Phosphating dry-wall screws are the most fundamental product series, while blue and white zinc dry-wall screws are a supplement. The application scope and purchase price of these two are basically the same. The only slight difference is that black phosphating has a certain degree of lubricity, and the attack speed (the speed of penetrating steel plates of a specified thickness, which is a quality assessment index) is slightly better. Blue-white zinc has a slightly better anti-rust effect, and the natural color of the product is light, making it less likely to show color after coating decoration.
| Applications | |||||
| car | In high-strength applications such as automotive engines, heavy-duty machinery, and bridge construction, they are preferred for their larger support area and better anti-loosening performance. | ||||
| mechanical | Mechanical, electronic, automotive, construction and other fields, used to connect various mechanical parts, circuit boards, engines, transmissions, building structures, etc | ||||
| energy | For the energy industry, brackets and fixtures used to connect power generation equipment and transmission lines | ||||
| architectural | In the field of construction engineering, shipbuilding, and petrochemical industry, it is used to connect building structures, improve the navigation safety and stability of ships, and ensure the safety and stability of petrochemical equipment | ||||
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).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.
3,Specifications:
| material | |||||
| aluminium | Aluminum has excellent thermal and electrical conductivity. However, aluminum is naturally soft and may produce gelatinous buildup after processing. If not properly operated, it is difficult to cut during processing. | ||||
| titanium | Edm machining is well suited for titanium because the process can withstand the viscosity of this alloy and break down lengthy chips. However, deionized water is needed as a medium to help control the heat generated during processing. | ||||
| steel | Steel is a very strong metal, and many manufacturers tend to use wire cutting machines instead of CNC machines for machining complex steel features. However, this material generates a lot of heat, so necessary precautions need to be taken. | ||||
| brass | Brass has a high tensile strength and is easy to cut by machine. But the cutting speed should be slow because it is a soft metal. | ||||
4,Feature Advantage:
The thread of single-line coarse-threaded drywall screws is wider, and the corresponding tapping speed is also faster. At the same time, since the structure of the wood material itself will not be damaged after being driven into the wood, they are more suitable for the installation of wooden keels than double-line fine-threaded drywall screws.
Abroad, in general construction, great emphasis is placed on choosing the right fastener products. Single-line coarse-threaded dry-wall screws, as an alternative to double-line fine-threaded dry-wall screws, are more suitable for use in the connection of wooden keels. In the domestic market, double-line fine-thread dry-wall screws have been used exclusively for a long time. It takes some time to change the usage habits.
5,About us
6.FAQ
A: We are factory and OEM are available.
A: Generally it is 7-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
A: 30% T/T in advance ,balance before shippment or L/C.
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