The implementation standards of self-tapping screws for drilling tails are GB / T 15856.1-2002, German standard DIN7504N-1995, and Japanese standard JIS B 1124-2003.

This kind of screw has a drill tail tip, and the tip is named like a twist drill. During assembly, the screw can drill the center hole by itself, and then self-tapping and squeezing the matching hole in the hole on the carrier by means of the adjacent thread part Thread, so called self-drilling self-tapping screw.

Drilling screws can be divided into national standard GB / T, German standard DIN, Japanese standard JIS, and international standard ISO according to the implementation standard.

 

According to the purpose and shape, it can be divided into the following categories:

1. Cross recessed pan head self-drilling self-tapping screws. Cross recessed pan head drilling screws with tapping screw thread Executive standard: GB / T 15856. 1-2002 has the following specifications: (also known as round head drilling tail).

2. Cross recessed countersunk head self-drilling self-tapping screws. Cross recessed countersunk head drilling screws with tapping screw thread Executive standard: GB / T 15856.2-2002 has the following specifications: (also known as flat head drilling, salad head drilling).

3. Cross recessed countersunk head drilling screws with tapping screw thread: Cross recessed countersunk head drilling screws with tapping screw thread Executive standard: GB / T 15856.3-2002 has the following specifications: This specification is a semi countersunk head and is relatively rare in the market.

4. Hexagon flange head drilling screws with tapping screw thread Implementation standard: GB / T 15856.4-2002 has the following specifications: (also known as hexagonal Dahuas drill tail, which is among the drilling screws The most commonly used and the largest quantity.)

5. Hexagon washer head drilling screws with tapping screw thread. Executive standard: GB / T 15856.5-2002 has the following specifications: (also known as hexagonal small Huasi drill tail.)

phillips-wafer-head-self-tapping-screw-zinc-plated-1

According to the material, it can be divided into:

Steel 1022A, stainless iron 410, stainless steel 304.

1. Carbon steel self-drilling screw, 1022A, standard heat-treated steel can be used as material for the production of self-drilling screw, the surface hardness after heat treatment is HV560-750, and the core hardness is HV240-450. Common surface treatment is easy to rust, high hardness and low cost.

2. Stainless steel self-drilling screws, 410, can be heat-treated, the anti-rust ability is better than carbon steel, and worse than stainless steel.

3. Stainless steel self-drilling screws, 304, can not be heat-treated, strong rust resistance, low hardness, high cost, can only drill aluminum, wood, rubber.

4. Compound drilling screws, the drill bit is made of carbon steel, and the thread and head are made of 304 stainless steel.

Uses: generally used for the fastening and connection of aluminum profiles, wood products, thin-walled steel pipes, steel plates and non-ferrous metal plates. Self-tapping and self-drilling screws are often used for the fastening and connection of steel plates or steel pipes with wall thickness greater than 2.0 When connecting, use screws to tap the threads directly.

Megosztás a facebookon

He's entering kindergarten this year and am planning on going back full time this year. This lady challenged me to decide whether I was a coach, a writer, or a TV personality. The screw probably has met you in the middle of your journey, and not at the place where the picture all fits together perfectly. I remember in my early days of giving workshops and seminars. I remember my face turning deep red, even when no one was around, at the mere thought of what I had said to the group in which I spoke.And then I think about the TV work I've done. I would feel incredibly silly or stupid at how I must have appeared to the people.

So strike out and get in gear. Sometimes they take some incredible detours to get to where they want to go. I have been working more on a part time basis for the past few years as my son was a toddler.I've realized that sometimes peoples' paths aren't on automatic pilot. She enjoys seeing the best come out in people and has fun in the process. And it's made me more compassionate. Mary is married to Sway and is mommy to Jeremy 5 and lives in Orlando, FL. Perhaps you are satisfied to have tried something, even if you didn't get to the top of your game with it.Now? 10 years later? I love giving workshops because I love helping people. It happens to anyone who doesn't want to settle. Maybe you have one, or a dozen things that you'd just like to try.

She works with screw, coaches and trains individuals, sales teams, executives, and celebrities. I've had experiences that many people will never get in a life time. It's fun and I know now that I've gotten more comfortable at it.I think about the writing that this woman thought was a waste of my time.And whose game is it that you're playing anyway? Theirs or YOURS?Mary Gardner is an Executive Communications Consultant and Coach. I know I'd never want to pursue car racing on a competitive level, but the exciting experience of flying around the track that fast was a major thrill.

I've been there. In all of those years, I've been tossed thousands of questions on coaching, communication, personalities or problems and have learned so much. She couldn't imagine that one person could do all of these well and so she told me, in no uncertain terms, that I was just probably being average at all of them.I was accused recently of being unfocused. I agree I haven't landed the BIG ONE, which would be my own national show, but I've done extremely well for a person who didn't pursue TV as a career for starters.com WEB: . I've done local reporting, anchoring, been a guest, a host, been on national TV, 20/20, QVC and pretty much could be camera ready wherever and whenever I needed to be. You'll be playing the game of life by your rules. Sometimes you just have to jump and let the net appear. Can you imagine how fun that can be? Can you imagine if you don't do them just because other people wouldn't?I've thought of all of the mavericks that are in the world and how they must have been criticized. There is a certain comfort in knowing that you don't have to know EVERYTHING. Does that qualify me to write professionally?

Megosztás a facebookon