304 Stainless Steel Hex Bolt & Nut Assortment Kit A2-70 Grade Full Thread Bolt with Flat & Spring Washers DIN 933 Standard for Industrial Fastening
Manufacturing Process
• Multi Station Cold Heading Technology
• Intelligent Heat Treatment System
• Micron-Level Thread Rolling Process
• Fully Automatic Optical Sorting
• Environmentally Friendly Surface Treatment Line
• Metallographic And Mechanical Joint Laboratory
Quality Control System
• Raw Material Source Locking
• Furnace Number Batch Full Traceability
• Third Party Material Certification
• Process Parameters Open And Transparent
• Salt Spray Test Real Time Monitoring
• International Standard Compliance Declaration
Flexible Customization Capability
• Customizable head/slot Shapes
• Extreme Application Of Special Materials
• Breakthroughs In Extra Large/Long Specifications
• Integrated Assembly Of Components
• Customizable Surface Treatment Colors
• Personalized Packaging And Labeling
Technical Service
• On-Site Failure Analysis
• Selection Calculation And BOM Optimization
• Installation Tool Selection Guidance
• Inventory Management (VMI) Trusteeship
• Free Sample Making And Testing
• International Standard Translation And Interpretation
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Rust-proof & Corrosion-resistant Stainless Steel Material
All components (bolt, nut, flat washer, lock washer) are made of 304/316 stainless steel (A2-70/A4-80). High chromium content forms a dense passivation film, preventing rust in humid, salt-spray, or chemical environments. No extra plating needed – ideal for outdoor construction, marine equipment, and food machinery, eliminating disassembly difficulties caused by corrosion.
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Metal Material for Tightening & Anti-Loosening
A2-70 stainless steel offers tensile strength ≥700MPa. The split lock washer provides continuous spring force, while the flat washer distributes pressure – together increasing thread friction torque. Full-thread bolt allows precise preload adjustment, effectively resisting vibration and impact loosening. Metal material never ages or becomes brittle, maintaining stable clamping force from -40°C to high temperatures.
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Long Service Life with High Wear Resistance
Stainless steel substrate with passivation offers high hardness and no plating peeling risk. During repeated assembly or high-vibration applications (e.g., automotive chassis, construction machinery), threads and washer contact surfaces resist wear, galling, and deformation. Proven in durability tests, the assembly maintains anti-loosening performance and connection precision for extended life, greatly reducing replacement frequency and maintenance costs.
Application Scenarios
Industrial Capabilities
• Factory Area: 8,000 square meters
• Certifications: ISO, IATF, CE, RoHS, JIS, ASTM
• Manufacturing : 70+ internationally advanced production lines
• Testing: 30+ sets of precision quality testing equipment
• Annual Output: Up to 50,000,000 tons
From Unprocessed Materials to Final Products
Our factory's fully automated production lines for cold heading, precision thread rolling, controlled-atmosphere heat treatment, and environmentally friendly surface finishing enable closed-loop manufacture from raw materials to finished items. Because of inline optical sorting and a digital MES, each fastener meets stringent standards for strength, accuracy, and surface quality. You guarantee the best fasteners: dependable, efficient, and ecologically conscious.
Lab for Innovation:
Are you working on any projects right now? Let's continue now. Our growth is fueled by talent and diligence, and we are always looking for new concepts. Are you working on a project? Let's continue now.
"Pain Point Diagnosis" to "Customized Implementation" in the Entire Joint R&D Process
We provide more than just traditional parts. From the beginning of your project, our multicultural engineering team actively contributes. We carefully consider the application environment and develop solutions in the lab, fully combining technology and application, to guarantee that innovative ideas are quickly transformed into practical solutions that reduce total lifetime costs.
Integrated Verification System: Using "Test Data" to Assure Innovation
The creative process doesn't stop at the drawing board. We offer one-stop verification for everything from corrosion testing to prototype development through our internal technical center. We employ empirical data to verify the performance stability of customized solutions through comprehensive simulated working condition tests. In addition to achieving genuinely dependable cost reduction and efficiency improvement, this greatly lowers project risks.
