Factory directly supply M4 Self Tapping Screw - China Hex Head Self Drilling Roofing Screws – Xinruifeng

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"Control the standard by the details, show the power by quality". Our business has strived to establish a highly efficient and stable team staff and explored an effective good quality regulate course of action for Metric Set Screw Assortment, Truss Head Self Drilling Screws, Self Tapping Security Screws, Our firm quickly grew in size and reputation because of its absolute dedication to superior quality manufacturing, substantial price of solutions and fantastic customer services.

Factory directly supply M4 Self Tapping Screw - China Hex Head Self Drilling Roofing Screws – Xinruifeng Detail:

1. Self-tapping screws have various names. They’re often called metal screws, sheet metal screws, tapping screws, or tapper screws.

2. Their tips come in different shapes: pointed (like a pencil), blunt, or flat, and they are described as thread-forming, thread-cutting, or thread rolling. If the screw is pointed, it will be thread-cutting – tapping and creating threads in a pre-drilled hole. If the tip is flat, it is thread-rolling – rolling or extruding threads and creating zero clearance between screw and material.

3. Self-tapping screws for plastic joining is reliable if used properly.

4. They are cheap compared to other means of joining.

5. Easily disassembled.

6. It doesn’t require pre-moulded threads.

7. Good impact and vibration resistance.

8. No curing time or settling time to achieve full strength.

9. No special tool required.

Tianjin Xinruifeng Technology Co., Ltd. has been in the fastener industry for nearly 20 years and we can customize all kinds of products per your requirements. We have an established management system and quality control procedure. Excellent quality, competitive price, and timely delivery are the pillars of the company’s foundation. Win-win and long-term cooperation is our final goals when dealing with different clients.

Size(mm)	Size(inch)	Size(mm)	Size(inch)	Size(mm)	Size(inch)	Size(mm)	Size(inch)
3.5*13	#6*1/2	3.5*65	#6*2-1/2	4.2*13	#8*1/2	4.2*102	#8*4
3.5*16	#6*5/8	3.5*75	#6*3	4.2*16	#8*5/8	4.8*51	#10*2
3.5*19	#6*3/4	3.9*20	#7*3/4	4.2*19	#8*3/4	4.8*65	#10*2-1/2
3.5*25	#6*1	3.9*25	#7*1	4.2*25	#8*1	4.8*70	#10*2-3/4
3.5*29	#6*1-1/8	3.9*30	#7*1-1/8	4.2*32	#8*1-1/4	4.8*75	#10*3
3.5*32	#6*1-1/4	3.9*32	#7*1-1/4	4.2*34	#8*1-1/2	4.8*90	#10*3-1/2
3.5*35	#6*1-3/8	3.9*35	#7*1-1/2	4.2*38	#8*1-5/8	4.8*100	#10*4
3.5*38	#6*1-1/2	3.9*38	#7*1-5/8	4.2*40	#8*1-3/4	4.8*115	#10*4-1/2
3.5*41	#6*1-5/8	3.9*40	#7*1-3/4	4.2*51	#8*2	4.8*120	#10*4-3/4
3.5*45	#6*1-3/4	3.9*45	#7*1-7/8	4.2*65	#8*2-1/2	4.8*125	#10*5
3.5*51	#6*2	3.9*51	#7*2	4.2*70	#8*2-3/4	4.8*127	#10*5-1/8
3.5*55	#6*2-1/8	3.9*55	#7*2-1/8	4.2*75	#8*3	4.8*150	#10*6
3.5*57	#6*2-1/4	3.9*65	#7*2-1/2	4.2*90	#8*3-1/2	4.8*152	#10*6-1/8

Self Tapping Screw:

1. Heat treatment: It is a method of heating steel to different temperatures and then using different cooling methods to achieve different purposes of changing the properties of steel. The commonly used heat treatments are: quenching, annealing, and tempering. What kind of effects will these three methods produce?

2. Quenching: A heat treatment method in which the steel is heated to above 942 degrees Celsius to make the steel crystals in austenitic state, and then immersed in cold water or cooling oil to quench to make the steel crystals in a martensitic state. This method can increase the strength and hardness of the steel. There is a very big difference in the strength and hardness of the steel with the same label after quenching and without quenching.

3. Annealing: A heat treatment method in which the steel is also heated to an austenitic state and then naturally cooled in air. This method can reduce the strength and hardness of the steel, improve its flexibility, and facilitate processing. Generally, steel will go through this step before processing.

4. Tempering: Whether it is quenched, annealed or press-formed, steel will generate internal stress, and the imbalance of internal stress will affect the structure and mechanical properties of the steel from the inside, so a tempering process is required. The material is kept warm continuously at a temperature of more than 700 degrees, its internal stress is changed and then cooled naturally.

In 2008, Tianjin Xinruifeng Technology Co., Ltd. was established in the beautiful coastal city of Tianjin. After more than a decade’s development, now we are a leading, professional and premium manufacturer with excellent capabilities of design, development, production and export. Our main products include drywall screws, chipboard screws, self-drilling screws and self-tapping screws, which are produced in 3 different production bases with a total area of 16,000 square meters.

We have 280 sets of automatic production equipments, including wire drawing machines, cold-heading machines, thread rolling machines, tailing machines and heat-treatment lines. There are more than 100 staff in our company. Among them, there is an experienced and professional R&D team, who follow an established management system and quality control procedure, allowing us to customize the products according to your specific designs/requirements to the highest quality. Further, we have CE Certification for drywall screws and SGS will conduct audit to our factory on a regular basis. Because of this and our great attention to high quality, there is not a single complaint about quality in the last 5 years.

1. To satisfy the demands from markets and customers, we have more than 300 machines in two shift production in order to provide all kinds of fasteners in the market home and abroad.

2. To prevent any mistakes from happening during the developement, the development procedure is strictly controlled under ISO 9001. From design → information collection → setting developing items → design input → design output → pilot run → design verification → mass production, every stage is strictly inspected & controlled by our R&D team. Based on the precise control from research, drawing, pilot run management and design change, the development will be cost effective and efficient.

Self-tapping screws are good for use with metals, various types of plastics (plywood, fiberglass, polycarbonates), and cast or forged material, like iron, aluminum, brass or bronze. Self-tapping screws also work for surfaces where you can’t secure the rear end with a nut. Common applications include fastening aluminum sections, attaching metal brackets onto wood, or inserting screws into plastic housings.

China Manufacturer Hex Head Self Drilling Roofing Screws2

Woven bag, carton, color box+ color carton, pallet etc (per customer’s request).

Generally, the production will take 4-5 weeks for one container. Please check details with us when you have a specific quantity. As a factory, we can guarantee the timely delivery of your order and will try out best to meet your tight deadline. Normally, the shipments will depart from Tianjin Port.

Q1: Are you a trading company or manufacturer?
A1: We are the manufacturer and have a professional sales team to serve you.

Q2: What is your terms of payment?
A2: 30%T/T in advance, balance before shipment. And we also can accept L/C at sight.

Q3. Can you provide a sample?
A3: Yes, We can supply sample for free and you only need to bear the freight cost.

Q4. Can you provide Test Report?
A4: Yes, we can provide our Test Reports for you. Or, you can ask a third party like SGS, BV etc to conduct quality test for you.

Q5: Can you provide Technical support and After sales service?
A5: Yes, we can provide you the technical support and after-sales service if needed.

Q6: How can we know more about your factory?
A6: You can follow our YouTube, Linkedin, Facebook and Twitter for updates.

Q7: How can we contact you?
A7: You can contact us via Phone, Email, WeChat, Whatsapp, Skype, Made-in-China Message and etc any time.