SWCH22A Glass Wool Blanket 5.5x25 Galvanized Wafer Head Self Drilling Roofing Teck Screw

5.5x25 Galvanized Wafer Head Self Drilling Roofing Teck Screw

Description

Self-drilling Screw similar to sheet metal screws, but they have a drill-shaped point to cut through sheet metal or steel which eliminates the need for drilling a pilot hole. These self-drilling screws are designed for use in soft steel or other metals.Self-drilling screw points are numbered from 1 through 5, the larger the number, the thicker metal it can go through without a pilot hole. A 5 point can drill a 0.5 in (13 mm) of steel, for example.

Specification

Compare to Self Tapping Screw

(1) Self Drilling Screw

Self drilling describes it very well. These screws work as both a drill bit and a fastener. Self Drilling Screw do not need a pilot hole because of the drill bit end. They work quite well at fastening thin pieces of metal together and were designed for exactly this reason. We have customers use these when doing frame work on their cars, or attaching sheet metal to a metal frame. Why drill a bunch of holes into a metal sheet wearing out a drill bit, when you can use these guys. They also have much variance in types and uses than tapping screws.

(2)Self Tapping Screw

Self tapping screws tap their own thread, so they need a pilot hole slightly smaller than the screws diameter. The idea is, you drill a pilot hole into wood or another soft material. Then as you drive the tapping screw in, its threads will dig into the material keeping it secure. Self tapping screws are ideal for all sorts of materials, including wood, metal, and brick. For harder surfaces, self tapping screws might have little notches on the thread to help cut the thread, just like a tap. Not all tapping screws have a pointy tip, some will be blunt or flat.

Packing and Shipping

Hong Kong Sunrise Group is a customer-oriented, innovative, value-driven company, which manufactures, processes and distributes steel products and service worldwide. Over the years, the group has built up serval iron and steel production and processing bases in East and North China with annual capacity over 1 millions tons and a well established sales network around the world. The group currently empoly staff over 1000 people and the total assets reach US dollars 50 millions.
Our main products includes below several different types:

1. Flat Steel --HRC, CRC, GI, GL, PPGI, PPGL
2. Sectional Steel---H beam, I beam, Channel Bar, Angle Bar, Round Pipe, Square pipe, T grid
3. Long Steel---Deformed bar, Wire rod
4. Powder Coating
5. Glass wool

Our factory located in beautiful coastal city of Shanghai, Tianjin with convenient transportation, which covers a large-scale manufacturing bases and more than two hundred of professional techinicians. Our products include cold rolled steel, galvanized steel, galvalume steel and pre-painted steel, etc.

We also have our two accessories building materials factories, one lies in Guangzhou, Yinda powder coating factory and another is inuslation materials lies in Tianjin, which supply glass wool and rock wool insulation materials.
Below is the production line information:

1. Cold Rolled Production Lines---- 4 Lines

2. Galvanized Production Lines---- 4 Lines

3. Galvalume Production Lines ---- 2 Lines

4. Pre-painted Production Lines ---- 4 Lines

Our products sell well in domestic andmore than 70 countries and regions throughout the world, mainly in South East Asia, South America, The Middle East, Turkey and Africa, Europe and so on.

We provide clients with the excellent and intergtative service of development and design, manufacturing and installation, testing and trainning, and insist on the business principle of "quality assured" and "reliable reputation".

Sincerely wish to strengthen business relations with friend both at home and abroad, creative beautiful future!