DIN7504 Phil Recessed Countersunk head Self-Drilling Tapping Screws

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Product Description

Product Name	DIN7504 Phil Recessed Countersunk head Self-Drilling Tapping Screws
Material	Carbon Steel, Stainless Steel 201/ 304/ 316 or others.
Size	8#-1813 ~ 14#-14125
Standard Model	DIN ANSI JIS ASTM
Min Order	1000piece/ pieces

Packaging & Shipping

Packing	Inner Box + Carton Box + Pallet or Under Your Requirement
Supply capacity	10000000 piece/ pieces per month
Delivery time	5~20 days after deposit
Export market	Asia, America, Europe, Africa, markets.

Our Services

1. Reliable Supplier
2. High Quality
3. Standard Producing Technology
4. Competitive Factory Price
5. Fast Delivery

1. Reliable Supplier

2. High Quality

3. Standard Producing Technology

4. Competitive Factory Price

5. Fast Delivery

Product Picture：

DIN7504 Phil Recessed Countersunk head Self-Drilling Tapping Screws

Q: What is the role of flat washers? There is a friend who can introduce: Flat washer is generally used in the connecting piece is a soft texture, a hard brittle, its main role is to increase the contact area, pressure distribution, to prevent the soft texture of the crush.2 parts between the connecting piece and the nut. A flat metal ring is generally used to protect the surface of the connecting piece from the nut.3 flat pad is to increase the contact area, and to prevent the bolt and workpiece friction;The main function of the 4 flat washer is to protect the surface of the connector, to prevent the bolt nut tightening when the workpiece surface

Q: The idiom of the screw: Lei Feng: I would like to always make a screw, a person's role, for the cause of the revolution, as a machine on a screw machine as a result of the many screws and fixed, only to become a solid whole, can Run freely, play its great ability to work. Although the screw is small, its role is not underestimated. I would like to make a screw hello forever. Screw to regular maintenance and cleaning, it will not rust. People's thinking is the case, to always check will not go wrong

Q: What tools are used to remove the screws, the two lines are grooves, the middle of a paragraph is convex: As for the professional name is not clear, probably should be called forked screwdriver it

Q: What is the difference between Chinese-made screws and US screws?: Formal manufacturers of screws from the size of the model is no difference (except small factories or workshops), the difference is mainly from the manufacture of screws and materials used in the surface of the treatment process only. Say even the Chinese exports of screws, in terms of manufacturing is also in accordance with foreign standards or contract requirements (such as the use of foreign customers specific raw materials or technology), the cost is relatively high, not the domestic market sales. Reference it.

Q: What are the advantages and disadvantages of car audio modification, wood washer and plastic washer?: One prevents resonance and one causes resonance! Better wood washer!

Q: How do you choose the appropriate gasket for bolt or screw connection?: When the bolt is connected, the target of the washer is to disperse the material which is connected with the material, reduce the damage to the surface of the material to be connected when the bolt or the nut is reduced, or prevent the loosening of the bolt. When you choose the gasket can be the actual need to relax the use of spring washers, to protect the surface of the material to be connected, optional plain washers. The principle of choice is that the inner diameter of the washer is slightly larger than the outer diameter of the bolt. Screw connection, the use of slightly larger than the location of the largest screw flat washers can be.

Q: M4.8 * 25 What does it mean in screw size?: Nominal diameter of 4.8mm, the length of 25.4.8 should be more from the tapping, should not use M said, M generally said machine thread M4.8 is the screw size 25 is the length of the screw diameter 4.8mm, length 25.

Q: No cross screwdriver, how can the screwdriver screwdriver?: Some nail holes have depth, you can use the female (black vintage kind) steel wire card flat steel filing with a file to repair a little more can be a little more, if the nail in the plane, The use will also be on the.

Q: What fasteners are manufacturers in China?: (13) Ningbo Xingyi Fasteners Co., Ltd. (14) Fu Ao Auto Parts Co., Ltd. Fasteners Branch;(15) Dongfeng Automobile Fastener Co., Ltd.

Q: What is the invention of the screw?: Screws Today, many things are screwed together. Look around the house, the eyes see all kinds of things - from furniture to food processors, are connected with screws. The spirits were invented more than 2,000 years ago, but less than 500 years for fixing things. The first man who describes the spiral is the Greek scientist Archimedes (about 287 BC - 212 BC). The Archimedean spiral is a huge spiral in a wooden cylinder that is used to raise water from one level to another and irrigate the fields. Its true inventor may not be Archimedes himself. Maybe he just described something that already existed. Perhaps it was the ancient Egyptian craftsmen who had designed it to use the irrigation on both sides of the river. Archimedes spiral in the ancient society are used to raise water, no one considered to change it into a fixed piece. Right: Archimedes spiral is widely used for water. For example, the Romans used it to drain the mine. In the Middle Ages, carpenters used wooden nails or metal nails to connect furniture and wooden structures. In the 16th century, nail workers began to produce spiral nails, these nails can be more firmly connected things. It was a small step from this nail to the screw. At the end of the eighteenth century, screws were quite popular as fixed parts, because at that time a cheap production method had been found. Screwdriver (chisel) appeared in London around 1780 years.

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