NXF GROUP
Phone/Whatsapp:+8613917160311
Email: info@nxf-group.com
Email: Andrew@nxf-group.com
Email: Alice@nxf-group.com
English
NXF USN A36/DIN17100/10025-2/G3101 Diameter M2-M30 Grade8-12.9 Length 2-200mm A36 Black Oxide Hex Socket Knurled-Head Cap Screws
2026-10-12 20:17 NXF GROUP
2
Products Description
A36 Introduction
ASTM A36 is the most commonly used mild and hot-rolled steel. It has excellent welding properties and is suitable for grinding, punching, tapping, drilling and machining processes. Yield strength of ASTM A36 is less than that of cold roll C1018, thus enabling ASTM A36 to bend more readily than C1018. Normally, larger diameters in ASTM A36 are not produced since C1018 hot roll rounds are used.
Black Oxide Hex Socket Knurled-Head Cap Screws Introduction
Black Oxide Hex Socket Knurled-Head Cap Screws are high-strength fasteners , designed for heavy-duty mechanical assembly applications. The cylindrical head is externally knurled, paired with an internal hex drive for wrench fastening, delivering powerful clamping force and reliable connection performance.
Treated with black oxide finish, the screws form a thin protective layer on the surface. This treatment improves lubricity during assembly, provides mild corrosion resistance and reduces light reflection, while retaining the original dimensional accuracy of threads and head structure. The knurled texture on the head surface increases friction, preventing slipping during installation and disassembly.
Manufactured to international fastener standards, these cap screws feature precise thread geometry, excellent tensile strength and fatigue resistance. They are widely adopted in machinery, automation equipment, molds, automotive assemblies and industrial tooling, ideal for joints requiring high preload strength and compact mounting space.
Treated with black oxide finish, the screws form a thin protective layer on the surface. This treatment improves lubricity during assembly, provides mild corrosion resistance and reduces light reflection, while retaining the original dimensional accuracy of threads and head structure. The knurled texture on the head surface increases friction, preventing slipping during installation and disassembly.
Manufactured to international fastener standards, these cap screws feature precise thread geometry, excellent tensile strength and fatigue resistance. They are widely adopted in machinery, automation equipment, molds, automotive assemblies and industrial tooling, ideal for joints requiring high preload strength and compact mounting space.
Black Oxide Hex Socket Knurled-Head Cap Screws Drawing
A36 Chemical Composition And Mechanical Properties
Factory and Product Pictures
Black Oxide Hex Socket Knurled-Head Cap Screws Product Pictures
A36 PMI spectral testing proves
Video of a customer visiting us
Product processing
Black Oxide Hex Socket Knurled-Head Cap Screws Product Processing
1.Raw Material Inspection & Blanking:
Adopt high-grade carbon steel wire rods conforming to international fastener standards. Strictly inspect chemical composition, tensile strength and surface condition to exclude raw materials with cracks, rust and inclusions. Cut steel wire into fixed-length blanks according to required screw specifications to prepare semi-finished materials for subsequent cold heading.
2.Cold Heading & Head Forming:
3.Knurling & Thread Rolling:
4.Heat Treatment & Stress Relief:
6.Sorting, Packaging & Warehousing:
2.Cold Heading & Head Forming:
Carry out precision multi-station cold heading process on steel blanks. Form the cylindrical head, inner hexagon socket and screw rod blank in one forming operation. Precisely control die pressure and forming speed to ensure complete inner hexagon shape, uniform head size and no internal cracking, laying the foundation for knurling and threading.
3.Knurling & Thread Rolling:
Perform knurling treatment on the outer circumference of the cylindrical head to form regular anti-slip knurled texture. Then conduct thread rolling process on the screw shank to create precise full threads. Strictly control thread pitch and diameter tolerance to guarantee smooth mating with matched nuts and stable clamping force.
4.Heat Treatment & Stress Relief:
Implement quenching and tempering heat treatment . Optimize internal metal grain structure, greatly improve tensile strength and wear resistance of the screw. Eliminate residual stress generated in cold forming and rolling processes to avoid cracking during service.
5.Deburring & Black Oxide Surface Treatment:
Remove sharp burrs on the head, hex socket and thread root. Complete degreasing and cleaning before black oxide treatment. Form a uniform black oxide conversion film on the surface to enhance lubrication performance and mild anti-corrosion ability, without changing the original dimensional accuracy of threads and hex socket. Conduct full quality inspection covering dimension check, hardness test, thread gauge verification and surface defect screening.
6.Sorting, Packaging & Warehousing:
Automatically sort qualified screws by different sizes and lengths. Use anti-rust paper and sealed packaging bags to protect threads and knurled surface from scratches. Attach standard labels with material grade, specification, production batch and inspection information. All finished products are stored in classified warehouses and delivered after final inspection.
Our NXF GROUP advantage as follow
1.Our NXF GROUP have our own factory, and we can control the cost by producing by ourselves. We have a great advantage in price and can give you the lowest price based on best quality.
2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent quality certificate system and trademark certificate.
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with a one-stop service.
2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent quality certificate system and trademark certificate.
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with a one-stop service.
Packing & Delivery
Packing
Delivery
Company Profile
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)
Certification
FAQ
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:
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:
1.Our NXF GROUP have our own factory, and we can control the cost by producing by ourselves. We have a great advantage in price and can give you the lowest price based on best quality.
2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent quality certificate system and trademark certificate.
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with a one-stop service.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
2.Our NXF GROUP can strictly control the quality. We have production, quality inspection, warehousing and other departments to coordinate and control the quality,Such as PMI and size testing.
3.Our NXF GROUP biggest advantage is 3S service. Small quantity, short time, special materials.
4.Our NXF GROUP have excellent quality certificate system and trademark certificate.
5.Our NXF GROUP have a comprehensive after-sales service guarantee, such as the transaction guarantee provided by Alibaba International Station, as well as remote technical guidance and services.
6.Our NXF GROUP have a well-established logistics support system that can save you both time and money, providing you with a one-stop service.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU；
Accepted Payment Currency:USD,EUR,CAD,HKD,CNY;
Accepted Payment Type: T/T,L/C,D/P D/A,Credit Card,PayPal;
Language Spoken:English,Chinese,Spanish,Russian
声明：此篇为NXF GROUP原创文章，转载请标明出处链接： https://www.nxf-group.com/h-nd-2400.html
Phone
+8613917160311
Whatsapp
Whatsapp
+8613917160311
Wechat
Wechat
Inquiry
Email
info@nxf-group.com
Inquiry
Inquiry