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NXF USN A36/DIN17100/10025-2/G3101 Grade 4-12 Diameter M1-110 Carbon Steel A36 Fastener Black Oxide Hexagonal Nut
2026-11-05 17:05 NXF GROUP
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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.
A36 Black Oxide Hexagonal Nut Introduction
A36 Black Oxide Hexagonal Nut is a standard carbon steel fastener manufactured from A36 carbon steel with black oxide finish. It features a regular hexagonal outer shape and precision internal thread, which can match corresponding bolts securely to form reliable fastening connections. The black oxide surface treatment provides mild corrosion resistance, reduces light reflection, and adds a sleek black appearance, while maintaining the original dimensional accuracy of the nut. This nut has good mechanical strength and ductility, easy for installation and disassembly with standard wrenches. It is widely used in machinery, steel structures, equipment assembly, and general engineering fields, suitable for indoor and dry working environments where moderate anti-rust performance is required. We support various thread sizes and customized specifications to meet different fastening requirements.
A36 Black Oxide Hexagonal Nut Drawing
A36 Chemical Composition And Mechanical Properties
Factory and Product Pictures
A36 Black Oxide Hexagonal Nut Product Pictures
A36 PMI spectral testing proves
Video of a customer visiting us
Product processing
A36 Black Oxide Hexagonal Nut Product Processing
1.Raw Material Inspection:
We adopt A36 carbon steel wire rod as the base material. Each batch will be inspected strictly, including chemical composition spectral testing, mechanical hardness testing, surface crack and scratch visual inspection, and dimensional tolerance verification of the wire rod. Any raw material with unqualified composition, surface defects or inconsistent specification will be isolated and returned to the supplier. Only raw materials that meet the standard requirements can be put into subsequent production.
2.Cold Heading Forming:
3.Thread Tapping:
4.Deburring & Degreasing Cleaning:
5.Black Oxide Surface Treatment:
6.Final Inspection & Packaging:
2.Cold Heading Forming:
The qualified steel wire is straightened first, then cut into fixed-length blanks according to the nut size requirement. The blanks are sent to the multi-station cold heading machine. Under precise high-pressure stamping, the blank is formed into a regular hexagonal outer shape and a reserved inner hole. The process controls the flatness of the hexagonal surface, the coaxiality of the inner hole and the outer hexagon, and the overall height of the nut to avoid deformation and cracking during cold forming.
3.Thread Tapping:
The cold-formed nut blank is positioned and fixed on the precision tapping machine. Standard taps are used to cut internal threads following the specified thread standard. After tapping, each nut is checked by thread go gauge and no-go gauge to verify thread pitch, tooth profile, thread tolerance and thread depth. Nuts with broken teeth, messy threads or tight gauge detection failure will be picked out as defective products.
4.Deburring & Degreasing Cleaning:
The nuts are put into the tumbling machine with abrasive media for barrel polishing to remove sharp burrs on hexagonal edges and the mouth of the inner thread. After tumbling, the nuts are transferred to the ultrasonic cleaning tank to remove stamping oil, metal chips and dust on the surface and inside threads. Then compressed clean air is used for thorough drying to ensure no residual oil and moisture, which is the prerequisite for stable black oxide film.
5.Black Oxide Surface Treatment:
The dried nuts are put into the alkaline blackening production line in batches. The whole process includes pre-treatment activation, alkaline blackening reaction, clean water rinsing, anti-rust sealing and hot air drying. Under stable temperature and reaction time, a uniform, thin and adherent black oxide conversion film is formed on the steel surface. This matte black film can improve the wear resistance and provide moderate rust resistance. We will check the color uniformity and film adhesion of the nuts to avoid mottling and peeling.
6.Final Inspection & Packaging:
Carry out sampling inspection according to the inspection standard, including overall dimension check, thread recheck, surface appearance check, black oxide coating inspection and sealing effect verification. Products with incomplete black film, scratch, deformation, unqualified thread will be eliminated. The qualified nuts are packed into moisture-proof plastic bags, then placed into export cartons. Each carton is attached with a clear label marked with material grade, specification, batch number, quantity and inspection mark, ready for shipment.
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
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Phone
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+8613917160311
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Email
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