Product Description
Steel is a general term for iron-carbon alloys with a carbon content of 0.02% to 2.11% by mass. The chemical composition of steel can vary greatly. Steel containing a small amount of manganese, phosphorus, silicon, sulfur and other elements and a carbon content of less than 1.7% is called carbon steel; in actual production, steel often contains different alloying elements according to different uses, such as manganese, nickel, vanadium, etc. Humans have a long history of application and research on steel, but until the invention of the Bain steelmaking process in the 19th century, steel production was a high-cost and low-efficiency task.Today, steel has become one of the most used materials in the world with its low price and reliable performance. It is an indispensable component in the construction industry, manufacturing industry and people's daily life. It can be said that steel is the material basis of modern society. Countersunk self-drilling screw is a special self-drilling screw with a countersunk head design, which can keep the surface flat and beautiful when tightening and avoid bulges. Countersunk self-drilling screws are widely used in various occasions that require tightening, especially in occasions that need to hide the bolt head or reduce surface bulges. The installation method of countersunk self-drilling screws is relatively simple, and no pre-drilling or tapping is required, which greatly improves work efficiency. Its unique thread design can form a good locking effect in a variety of materials (such as metal, wood, plastic, etc.).
Countersunk Self Tapping Screws Drawing

S235JR of Chemical composition and mechanical properties
Product name | Countersunk Self Tapping Screws |
Material | S235JR/A105GR B/DINST37-2/JISSS400/ASTMA |
Size | ST2.9 |
Surface | Zinc plated |
Standard | JR/GR B/DIN/JIS/ASTM |
MOQ | 1 Piece |
Length | 25mm |
Application | Industry |
Packing | Standard Seaworthy Packing |
Brand | NXF |
Packing & Delivery


To better ensure the safety of your goods, professional, environmentally friendly, convenient and efficient packaging services will be provided.

New XiFei (SuZhou) Business Co.,Ltd is one of the leading and most respected manufacturers in China. Our products include metals,machinery, containers, construction materials, mechanical products, electrical systems, and medical accessories. Established in1980, XIFEI has been working diligently ever since to embrace the needs of our global customer base.We work to ensure absolute customer satisfaction. Our team has dedicated itself to perfecting our three core components, "Service, Management and Craftsmanship."
Our advantage:3S Service(Small Quantity/Short Time/Special Material)
Application

Certifications

1. who are we?
We are based in Jiangsu, China, start from 2021,sell to South Asia(30.00%),Eastern Asia(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%),Domestic Market(5.00%),North America(5.00%),Northern Europe(5.00%),Central America(5.00%),Africa(5.00%),Southeast Asia(5.00%). There are total about 101-200 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
Pipe,Flange,Steel plate,Pipe fittings,Alloy products
4. why should you buy from us not from other suppliers?
Our advantage:3S Service (Small Quantity/Short Time/Special Material) We have our own factories, quality can be controlled seriously. We Specialize in manufacturing about 21 years. We have professional testing department and testing equipment.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA;
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A;
Language Spoken:English,Chinese
6. Are you trading company or manufacturer ?
We are manufacturer.
7. How long is your delivery time?
Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
8. Do you provide samples ? is it free or extra ?
Yes, we could offer the sample for free charge but need pay the cost of freight.
9. What is your terms of payment ?
Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.