M6-M20 Extra Long 304 SS Hex Bolt & Threaded Rod (210-500mm)
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Precision Threaded Rods & Industrial Fasteners Range
Factory-direct OEM/ODM manufacturing engineered to ASTM, DIN, ASME, and ISO standards for heavy engineering, petrochemical, marine, and infrastructure projects.
Dark Coated Stainless Steel Socket Head Screw Flat End Hardware
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Alloy Steel High Strength Cap Head Socket Bolts OEM Machined
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Stainless Steel Protruding Head Welded Studs A2-70 / A4-80
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High Strength Brass Hex Insert & Lock Nuts
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ISO9001 Stainless Steel 304/316 Safety Tactile Studs
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Stainless Steel GB859 Light Type Spring Lock Washers
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Custom Carbon Steel Self-Locking Hex Nuts M2 to M12
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105+
Exporting Countries
350+
Global Projects Delivered
DIN / ISO
Certified Manufacturing
EN 10204 3.1
Mill Test Documentation
Engineering Excellence in OEM/ODM Metric Threaded Rod Manufacturing
Metric threaded rods—commonly designated under standards such as DIN 975, DIN 976, ASME B18.31.2, and ISO 898-1—serve as essential structural fasteners across oil and gas, heavy civil construction, chemical processing, marine engineering, and power generation sectors. As a premiere OEM/ODM metric threaded rods factory and global supplier, our production setup integrates specialized cold drawing, thread rolling, heat treatment, and precision surface finishing to satisfy stringent mechanical performance requirements.
Information Gain Insight: Unlike standard cut threads which interrupt metal grain structures, cold thread-rolling preserves continuous grain flow line integrity along pitch geometry, elevating fatigue strength by up to 30% under cyclic mechanical stress.
Material Selection Matrix & Metallurgical Engineering
Selecting the precise alloy composition for metric threaded studs and rods requires matching tensile strength, yield stress, elongation limits, and pitting resistance equivalent numbers (PREN) against specific working environments:
- Austenitic Stainless Steel (AISI 304/304L, 316/316L, 321, 347): Configured in property classes A2-70, A4-70, and A4-80. Offers high resistance to general atmospheric corrosion, chemical acids, and chloride pitting. Essential for cleanrooms, food processing, and municipal wastewater processing.
- Duplex & Super Duplex Steels (UNS S31803 / S32205 / S32750 / S32760): Combines high mechanical yield strength (>550 MPa) with high PREN (>40), ideal for subsea oil manifolds, desalination plants, and marine structural splash zones.
- High-Temperature Nickel Alloys (Inconel 600/625/718, Hastelloy C276): Engineered for thermal resistance up to 980°C and severe acidic environments, preventing oxidation, stress-corrosion cracking (SCC), and hydrogen embrittlement in petrochemical flare systems.
- Titanium Alloys (Grade 2 & Grade 5 Ti-6Al-4V): Delivers an extraordinary strength-to-weight ratio combined with total immunity to saltwater corrosion for aerospace, deep-sea submersibles, and specialized medical/military assemblies.
- Quenched & Tempered Carbon & Alloy Steel (Grades 4.8, 8.8, 10.9, 12.9, ASTM A193 B7/B16): Formulated for extreme tensile bolting in heavy machinery bases, structural steel buildings, and high-pressure pipe flanges.
Metric Threaded Rod Material Specification & Application Guide
| Material / Grade | International Standard | Tensile Strength (MPa) | Yield Strength (MPa) | Primary Industrial Application |
|---|---|---|---|---|
| Stainless Steel 304 (A2-70) | DIN 975 / ISO 3506-1 | 700 - 850 | 450 | Architectural support, general engineering, clean energy |
| Stainless Steel 316L (A4-80) | DIN 976 / ISO 3506-1 | 800 - 1000 | 600 | Marine hardware, chemical tanks, coastal civil structures |
| Duplex 2205 (UNS S32205) | ASTM A276 / EN 10272 | 700 - 900 | 450 - 550 | Offshore oil & gas piping, high-pressure desalination |
| Alloy Steel Grade 10.9 | ISO 898-1 / DIN 975 | 1040 | 940 | Heavy automotive suspensions, structural steel joints |
| ASTM A193 Grade B7 | ASME B18.31.2 / ASTM A193 | 860 (Min) | 725 (Min) | High-pressure flange valves, power boilers, pressure vessels |
| Inconel 625 (UNS N06625) | ASTM B446 / ISO 15156 | 830 (Min) | 415 (Min) | Subsea gas extraction, high-temperature furnace bolts |
Factory OEM/ODM Customization & Quality Control Systems
As a global leader in metric stud rod manufacturing, our facility supports full-cycle custom engineering (OEM/ODM). We accommodate custom pitch profiles, non-standard lengths (from 10mm up to 6000mm), specialized end chamfering, centerless grinding, and complex multi-layer anti-corrosion coatings.
Precision Thread Rolling
Utilizing high-tonnage two-die and three-die CNC thread rolling machines ensuring class 6g, 6h, and 4h tolerance limits with micro-inch surface smoothness.
Advanced Protective Coatings
Factory-applied finishes including Hot-Dip Galvanizing (HDG), PTFE / Xylan fluoropolymer coating, Electro-Zinc Plating, Geomet, and Cadmium plating for extended salt-spray resistance.
Strict Quality Assurance
Every heat batch undergoes Positive Material Identification (PMI), Spectrometric Chemical Analysis, Tensile/Yield testing, Micro-hardness profiling, and Ultrasonic Flaw Detection.
Our quality verification processes comply fully with ISO 9001:2015 specifications. Complete material mill test certificates according to EN 10204 Type 3.1 accompany every export container, assuring project engineers of zero risk in critical structural installations.
Future Procurement & Technological Trends in Metric Threaded Rods
1. Microstructure Optimization & Green Steel Sourcing
Global supply chain decarbonization mandates are driving EPC contractors toward suppliers utilizing low-carbon "Green Steel" processed via Electric Arc Furnaces (EAF) powered by renewable energy. Furthermore, metallurgical innovations in grain-refinement techniques yield high-strength metric rods with reduced raw alloy additions, lowering weight while preserving load-bearing ratings.
2. Transition to Advanced Fluoropolymer & Multi-Layer Coatings
Traditional zinc electroplating is increasingly replaced in offshore and chemical procurement by advanced multi-layer coatings. PTFE (Polytetrafluoroethylene) and ceramic-metallic Geomet coatings eliminate the risk of hydrogen-assisted cracking while providing extremely low friction coefficients (μ = 0.08 to 0.12), ensuring predictable bolt tensioning during automated assembly.
3. Integration with Robotic & Modular Construction Lines
As offsite modular construction accelerates, procurement demands metric threaded rods with precise chamfer lead-ins and tighter pitch tolerance (Class 4h/6g). This precision prevents cross-threading during automated nut-runner robotic operations on modern modular assembly lines.
4. Digital Traceability & Blockchain Mill Certificates
Leading global buyers now require digital heat-number integration. By embedding QR codes or RFID tags onto master crates, site inspectors instantly verify full EN 10204 3.1 MTC data, raw ingot source, third-party lab inspection logs, and shipment tracking directly via cloud databases.
Frequently Asked Questions (Procurement & Technical FAQ)
What is the difference between DIN 975 and DIN 976 metric threaded rod standards?
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DIN 975 originally specified 1-meter long continuously threaded rods across all metric sizes. However, DIN 975 was officially withdrawn and superseded by DIN 976. DIN 976 defines specific cut lengths (e.g., 1000mm, 2000mm, 3000mm) as well as stud bolts with defined end chamfers and pitch tolerances. Our factory manufactures metric rods strictly according to DIN 976-1 Form A and Form B standards.
How do thread rolling and thread cutting compare for OEM metric rods?
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Thread rolling is a cold-forming process that reshapes steel grains along the thread profile without removing material. This creates a smooth surface finish, burnishes thread roots, and increases fatigue strength by 20% to 30%. Thread cutting removes material, creating microscopic stress risers at thread roots. Our factory utilizes cold thread rolling for all high-volume OEM/ODM orders to guarantee maximum structural safety.
What quality certification and testing documentation do you provide for export shipments?
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Every shipment includes comprehensive EN 10204 3.1 Mill Test Certificates (MTC) documenting chemical composition, mechanical yield and tensile strength, elongation percentages, hardness, and heat numbers. Upon request, we also arrange independent third-party inspections via Bureau Veritas (BV), SGS, TÜV, or Lloyd's Register.
Can your facility produce non-standard pitch sizes and custom lengths?
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Yes. As a dedicated OEM/ODM factory, we produce custom fine-pitch metric rods (e.g., M12x1.25, M16x1.5, M20x1.5) as well as left-hand threads, extra-long lengths up to 6 meters, and custom CNC-machined unthreaded shoulders according to client technical drawings.
What are your minimum order quantities (MOQ) and production lead times for custom orders?
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For standard stainless steel (SS304/SS316) metric rods in DIN 976, we maintain extensive stock for immediate dispatch. For custom OEM drawings, special alloys (Inconel, Duplex, Titanium), or custom coatings, typical lead time ranges from 10 to 25 business days depending on volume and testing requirements.
Partner with a Trusted OEM/ODM Metric Threaded Rod Manufacturer
Direct factory pricing, strict quality control, and full international certification for your project requirements.