Black Zinc Plated Steel Pan Head Cross Slot Self Tapping Screws DIN7981

• Material: Stainless Steel
• Shape of Head: Pan
• Surface Finishing: Zinc Plated
• Certification: ISO, RoHS, CE
• Customized: Customized
• Samples: Free
• Model NO.: PH-BSTSFTPC-001
• Service: Excellent
• Quality Control: 100% Inspection Before Shipment
• Trade Terms: EXW Fob etc
• Payment: Tt Western Union Money Gram Paypal etc
• Transport Package: PE Bag + Carton Box + Pallet
• Specification: ST1.7-6.3mm
• Origin: Dongguan Guangdong China
• HS Code: 7318140090
• Production Capacity: 15000000PCS Per Month

Product Description

 

Product Description

Black Zinc Plated Steel Pan Head Cross Slot Self Tapping Screws DIN7981
1	Standard	DIN7981
2	Size	ST1.7-ST6.3
3	Material	Steel iron etc
4	Applications	Building, Industrial, Furniture...
5	Finish	Black zinc ,oxide etc
6	Payment	TT,Western Union ,Paypal
7	Package	PE bag+ Carton box + Pallet
8	Delivery Term	FOB,EXW etc
9	MOQ	10000pcs
10	HS code	7318140090

Classification and anti-corrosion technology of self-tapping screws 


Self-tapping screws have high strength self-tapping nails and ordinary self-tapping screws, the difference is the hardness, tensile strength and other mechanical properties are different, general fasteners, for screws above 8.8, called high strength screws, screws below 8.8 are called ordinary screws. According to different classification methods, self-tapping screws have more detailed classification, such as according to the standard can be divided into: national standard (GB) self-tapping screws, German standard (DIN) self-tapping screws, American standard (ANSI) self-tapping screws, British standard (BS) self-tapping screws; According to the groove type, there are: a slot head type (also called slot), cross slot head type, eleven word compound slot head type, rice slot head type self-tapping screws, which can be divided into: round head, flat head (that is, countersunk head), top column head, dome wide edge head, big round head (that is, big flat head), hexagonal socket head, hexagonal socket head, hexagonal head

There are two common colors of self-tapping screws on the market, black self-tapping and white self-tapping screws, both of which are surface chemical treatment processes to prevent the surface of the screw from rusting, which does not affect the internal organization, and the effect of anti-rust is also similar. The black is called chemical oxidation of steel, commonly known as boiling black, and the white is called galvanizing. Both processes give the self-tapping screw anti-corrosion properties.

1, self-tapping screws cooking black
Black, black, blue is actually the same thing, the professional name is chemical oxidation of steel. In the process of Hongyao Hardware, the oxidation treatment of steel parts is to immerse the steel parts in the oxidation solution, maintain a certain time, and form an oxide film with ferric oxide as the main component on the surface of the workpiece, which can improve the corrosion resistance of the parts. The film thickness after oxidation treatment is 0.5-1.5 microns, which has no significant impact on the size and accuracy of parts, and has the characteristics of low cost, high efficiency, no impact on dimensional accuracy, and no hydrogen embrittleness defects.

2, self-tapping screws galvanized
In the metal element, zinc is not easy to change in the dry air, and in the humid air, the surface can generate a very dense zinc carbonate film, which can effectively protect the interior from corrosion. There are many types of galvanizing, and the more common is cold galvanizing. Cold galvanizing, also known as electric galvanizing, is the use of electrolytic equipment to remove oil, pickling, after the composition of zinc salt into the solution, and connected to the negative electrode of the electrolytic equipment, placed on the opposite side of the zinc plate, connected to the positive electrode of the electrolytic equipment on the power supply, the use of current from the positive electrode to the negative electrode will deposit a layer of zinc on the pipe, in order to achieve the purpose of rust prevention.
PROSPECT hardware has a variety of types of self-tapping nails, welcome quality customers at home and abroad to call us!



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Advantages 

- Free mold opening
- Free drawing
- Fast delivery
-Non-standard customization
- Adequate inventory
- Quality guarantee


FAQ

1) Are you a trade company or factory ?
 Re:We are a factory 
 
2) What is your delivery time ?
 Re: For samples order we need 1-3 working days ,bulk order we need 7-15 working days after your payment 
 
3) How to do ODM order ?
Re:Just sending the picture ,technical drawing or as well as prototype you have ,then our engineers will estimate it and let you know asap 
 
4)How about your quality control system ?
Re:we have completed quality control system ,and will check the products one by one before shipment 
 

5)What is the main market ?

Re : We are mainly on Europe,Asia and North America market

6)Can i get free samples ?what are the rules of samples in your company ?
Re: Yes ,Samples can be free for standard item ,qty 10-20pcs but customer pay for the freight ,for Non-standard item,customer has to pay for mold fee and freight