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NXF USN A36/DIN17100/EN 10025-2/JIS G3101 M1.6-56 Grade 4.8-12.9 Length 3-450mm Carbon Steel Fastener Black Oxide Hexagon Bolts
2026-09-14 20:36 NXF GROUP
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Product 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.
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 Carbon Steel Fastener Black Oxide Hexagon Bolts Introduction
Carbon Steel Hex Bolt is a mainstream standard fastening component widely adopted in general machinery and structural connection fields. Manufactured from high-quality carbon steel and finished with professional black oxide (blackening) surface treatment, the bolt forms a uniform black protective layer on the surface. This treatment effectively improves surface hardness, enhances wear resistance and scratch resistance, and provides mild anti-rust performance during storage and indoor service. Different from galvanized products, black oxide treatment maintains precise thread tolerance, avoids plating thickening and ensures smooth and accurate assembly. Featuring stable mechanical strength, high cost performance and compact appearance, carbon steel hex bolts with black oxide finish are widely applied in precision machinery, automotive parts, machine tools, electronic equipment, indoor mechanical assembly, mold accessories and general industrial fastening fields, especially suitable for scenarios requiring high assembly precision, clean surface appearance and moderate anti-corrosion performance.
A36 Carbon Steel Fastener Black Oxide Hexagon Bolts Drawing
A36 Chemical Composition And Mechanical Properties
Factory and Product Pictures
A36 Carbon Steel Fastener Black Oxide Hexagon BoltsProduct Pictures
A36 PMI spectral testing proves
Video of a customer visiting us
Product processing
A36 Carbon Steel Fastener Black Oxide Hexagon BoltsProduct Processing
1.Raw Material Inspection & Blanking:
Adopt high-quality carbon steel wire rods that comply with DIN, ISO and ASTM industrial standards. Strictly inspect chemical composition, mechanical properties, surface smoothness and internal metallographic structure to eliminate cracks, oxide scales and inclusions. Qualified raw materials are precisely cut into fixed-length blanks according to bolt specifications, ensuring consistent size and weight for standardized cold forming.
2.Surface Pretreatment & Cold Heading Forming:
2.Surface Pretreatment & Cold Heading Forming:
Complete professional pretreatment including degreasing, pickling and phosphating to remove surface oil and rust, improving lubricity for stable forming. Adopt multi-station cold heading technology to complete one-time integral forming of hexagonal head, transition fillet and bolt rod. Cold forming maintains continuous metal fiber flow, dense internal grain structure and high dimensional accuracy, greatly improving tensile strength and structural stability.
3.Trimming, Straightening & Heat Treatment:
3.Trimming, Straightening & Heat Treatment:
Remove forming burrs and flashes on the hex head and rod surface. Conduct precise straightening to ensure rod verticality and assembly flatness. Perform standardized quenching and tempering heat treatment to adjust hardness and toughness, effectively eliminating cold forming residual stress and improving fatigue resistance and load-bearing performance for long-term mechanical fastening.
4.Precision Thread Rolling:
4.Precision Thread Rolling:
Adopt high-precision thread rolling process to form standard full or half threads. Strictly control thread pitch, tooth profile and tolerance grade in accordance with international standards. Rolling forming produces smooth thread surface, dense tooth texture and accurate meshing size, ensuring stable locking performance, uniform stress bearing and reliable anti-loosening effect under mechanical vibration.
5.Black Oxide Surface Treatment & Quality Inspection:
5.Black Oxide Surface Treatment & Quality Inspection:
Adopt professional black oxide (blackening) treatment as the core surface process. Through degreasing, alkaline oxidation, cleaning and oil sealing procedures, a uniform and dense black protective film is formed on the surface. This process will not cause thread thickening or dimensional deviation, effectively improving surface wear resistance, scratch resistance and texture appearance while providing moderate anti-rust and oxidation resistance for indoor and dry working environments. Conduct full-range inspections including dimensional tolerance check,hardness test, tensile strength test, thread precision calibration and surface defect detection to ensure all indicators meet industrial standards.
6.Marking, Packaging & Warehousing:
6.Marking, Packaging & Warehousing:
Mark qualified carbon steel hex bolts with strength grade, specification, standard code and production batch. Complete automatic sorting and counting, and adopt dust-proof, moisture-proof and anti-collision standardized packaging suitable for black oxide finished products. All finished products are classified and stored in warehouses and delivered after final verification.
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: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,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
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,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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+8613917160311
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