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NXF UNS S316/DIN 1.4401/AISI 316/0Cr17Ni12Mo2 Grade 4.8-12.9 Diameter M1.4-24 Length 2-200mm Hex Socket Countersunk Head Screw
2026-09-11 18:46 NXF GROUP
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Product Description
Stainless Steel 316 Introduction
316 is chrome-nickel austenitic alloy. It also contains molybdenum which increases general corrosion resistance, improves resistance to pitting from chloride ion solutions, and provides increased strength at high temperatures.316 also provide excellent fabricability and formability. It is also called Marine Grade Stainless Steel.
316 Hex Socket Countersunk Head Screw Introduction
Hex Socket Countersunk Head Screw is a precision concealed fastener designed for flush and flat assembly requirements. Featuring a tapered countersunk head and internal hexagon drive structure, this screw can be completely recessed into the workpiece surface,achieving a smooth and gap-free finished surface without protruding parts. The inner hex drive allows high-precision torque control, providing firm clamping force, excellent repeatability and effective anti-loosening performance during frequent assembly and disassembly. Manufactured from high-grade carbon steel, alloy steel and stainless steel in compliance with DIN, ISO and ASTM standards, hex socket countersunk head screws possess high surface hardness, strong tensile resistance and stable structural durability.They are widely used in precision machinery, automation equipment, electronic instruments, automotive manufacturing,mold industry and lightweight structural assembly, ideal for scenarios requiring neat appearance, compact installation space and reliable fastening strength.
316 Hex Socket Countersunk Head Screw Drawing
316 Chemical Composition And Mechanical Properties
Factory and Product Pictures
Hex Socket Countersunk Head Screw Product Pictures
316 PMI spectral testing proves
Video of a customer visiting us
Product processing
316 Hex Socket Countersunk Head Screw Product Processing
1.Raw Material Inspection & Blanking:
Adopt high-quality carbon steel, alloy steel and stainless steel wire rods that comply with DIN, ISO and ASTM international standards. Strictly inspect chemical composition, mechanical properties, surface finish and internal metallographic structure to screen out materials with cracks, inclusions, oxide scales and impurities. Qualified raw materials are precisely cut into fixed-length blanks according to screw specifications to prepare for cold forming processing.
2.Surface Pretreatment & Cold Heading Forming:
2.Surface Pretreatment & Cold Heading Forming:
Complete professional surface pretreatment including degreasing, pickling and phosphating to remove oil stains and oxide layers, improving surface lubricity for precise forming. Adopt multi-station cold heading technology to finish one-time integral forming of tapered countersunk head, inner hexagonal socket and screw rod. The cold forming process maintains continuous metal fiber flow, ensures compact internal structure and high dimensional accuracy, and improves overall fastening strength and structural stability.
3.Trimming, Shaping & Heat Treatment:
3.Trimming, Shaping & Heat Treatment:
Remove tiny burrs and forming flashes on the countersunk tapered surface, inner hex hole and rod body. Conduct fine shaping and calibration to ensure standard taper angle, flat sinking effect and accurate hex socket size. Perform standardized heat treatment including quenching and tempering for high-strength models and stress relief annealing for stainless steel screws, eliminating residual forming stress and stabilizing hardness, toughness and anti-fatigue performance.
4.Precision Thread Rolling:
Adopt high-precision thread rolling process to form standard full-section threads. Strictly control thread pitch, tooth profile and tolerance grade in accordance with industry specifications. Rolling forming features dense thread texture, smooth surface and high meshing accuracy, ensuring uniform stress distribution, stable locking performance and excellent anti-loosening ability during long-term fastening and vibration working conditions.
5.Surface Treatment & Quality Testing:
5.Surface Treatment & Quality Testing:
Provide customized surface treatments such as electro-galvanizing, blackening, nickel plating and passivation to enhance anti-rust, anti-corrosion and wear-resistant performance. Carry out full-scale quality inspection including dimensional tolerance detection, inner hex precision test, hardness detection, tensile strength test and nondestructive flaw detection to ensure all indicators meet precision fastener manufacturing standards.
6.Marking, Packaging & Warehousing:
Mark qualified hex socket countersunk head screws with strength grade, product specification, execution standard and production batch. Complete automatic sorting, counting and dust-proof, moisture-proof and anti-collision standardized packaging. All finished products are classified and stored in warehouses and delivered after strict 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: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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Phone
+8613917160311
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+8613917160311
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Email
info@nxf-group.com
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