DIN444 Eye Bolt Specifications
Parameter | Details |
Product Model | DIN444 Swing Eye Bolt |
Main Strength Grade | Grade 8.8 Alloy Steel; Optional Grade 4.8 Carbon Steel, A2-70/A4-70 Stainless Steel |
Execution Standard | DIN444 German Industrial Standard |
Thread Tolerance | 6G Precision Metric Coarse Thread, Standard Tolerance & Strong Interchangeability |
Structural Feature | One-piece forged eye structure, no rotating part, flexible small-angle hinge swing for angle deviation adaptation |
Surface Finish | Main: Hot-Dip Galvanized (HDG); Optional: Electro-galvanized, Black Oxide, Stainless Steel Natural Finish |
Size Range | M6-M24 Full Sizes In Stock, Custom Non-standard Lengths Available |
Application | Mechanical Hinge Connection, Door & Window Tensioning, Lifting Fixture, Agricultural Machinery, Photovoltaic Bracket, Outdoor Steel Structure, Chain Tension Device |
Certification | ISO9001, Material Test Report, Tensile Strength Test, Salt Spray Test, Batch Quality Certificate |
Package | Standard Export Carton & Pallet, Custom Neutral Export Packaging Supported |
Delivery Time | 3-7 days for regular stock sizes, 15-25 days for bulk and customized orders |
DIN444 Eye Bolt Features & Advantages
One-piece Forged Structure, Flexible Hinge & Stress Relief
Adopting classic DIN444 one-piece forged eye structure without separable rotating ring, the bolt allows small-angle flexible hinge swing to adapt to operational angle deviation. It effectively releases assembly stress and buffers vibration load, avoiding structural fracture and workpiece deformation caused by rigid fastening, perfectly suitable for angle-adjustable tensioning and frequently shaking working conditions.
Grade 8.8 High-strength Alloy, Excellent Fatigue Resistance
The main product is made of 40Cr alloy steel with high-temperature quenching and tempering treatment, balancing hardness and toughness. It features outstanding tensile strength and alternating load resistance, not easy to slip, bend or break after long-term repeated tension, ensuring stable performance for heavy-duty mechanical and engineering scenarios.
HDG Long-lasting Anti-corrosion for Outdoor Use
Hot-dip galvanized finish with thick and uniform zinc layer provides far better salt spray resistance and weatherability than ordinary electro-galvanizing. It can resist long-term wind, rain, sunlight oxidation and mild acid-base corrosion, greatly extending service life in outdoor steel structures, photovoltaic supports and open-air equipment environments.
Precision Standard Technology, Easy Installation & Strong Compatibility
Manufactured by automatic cold heading and precision thread rolling, with smooth full threads and burr-free appearance. Strictly compliant with DIN444 standard tolerance, it is perfectly compatible with standard nuts and washers, featuring smooth assembly and strong interchangeability for various standard and non-standard equipment assembly.
Grade 4.8 Carbon Steel Economy Type
Made of high-quality low-carbon steel with good toughness and cost performance. Suitable for indoor dry, light-duty static hinge and small equipment tensioning scenarios without corrosion and heavy impact, ideal for general bulk procurement.
Grade 8.8 HDG High-strength Type (Main Sale)
Core promoted model with dual advantages of alloy steel strengthening and HDG anti-corrosion. It adapts to outdoor open-air, humid and heavy-duty alternating load conditions, widely used in outdoor steel structures, agricultural machinery, lifting tooling and photovoltaic tensioning projects with high market demand.
304 Stainless Steel Type (A2-70)
Authentic 304 stainless steel features excellent rust and oxidation resistance, non-magnetic and deformation-free. It is suitable for humid indoor, outdoor garden, water treatment and ordinary coastal environments with moderate anti-corrosion requirements.
316 Stainless Steel Type (A4-70)
High-end anti-corrosion premium version. 316 molybdenum stainless steel has superior acid, alkali and salt spray resistance, adapting to severe working conditions such as coastal salt spray and chemical corrosion, widely used in marine equipment, chemical machinery and high-end outdoor projects.
Production Process
Graded Material Selection: Select high-purity raw materials according to different grades to ensure structural stability and mechanical performance from the source.
Integrated Cold Heading Forming: One-piece automatic cold heading forming with regular eye ring and straight screw rod, no burrs or deformation.
Precision Thread Rolling: High-precision thread rolling ensures full thread profile and standard tolerance for perfect fitting.
Graded Heat Treatment: Exclusive tempering process for Grade 8.8 alloy steel to stabilize hardness and toughness and avoid brittle fracture.
Custom Anti-corrosion Treatment: Provide HDG, electro-galvanized, black oxide and polishing processes to meet diverse anti-rust needs.
Full Batch Inspection: Strictly test dimension, thread accuracy, hardness and anti-corrosion performance batch by batch with complete qualification reports.
Application Industries
Mechanical Equipment Hinge: Flexible hinge fastening for electromechanical equipment and automated tooling.
Outdoor Engineering Facilities: Tension assembly of photovoltaic brackets, steel structures and outdoor guardrails (HDG preferred).
Lifting Tooling Equipment: Connection of lifting fixtures, chain tensioning and adjustable lifting components.
Agricultural Machinery Equipment: Movable connection and tension fixing of agricultural and garden machinery.
High-end Anti-corrosion Equipment: Hinge assembly for water treatment, coastal and chemical equipment (304/316 stainless steel).
Why Choose Our DIN444 Eye Bolts
We specialize in DIN standard swing eye bolt production, covering full series of carbon steel, HDG high-strength and stainless steel types to meet light, medium and heavy-duty working conditions. All products are manufactured strictly in accordance with German standards with stable batch quality and sufficient stock. We support non-standard size customization and special surface treatment, providing complete material and performance test reports. We provide cost-effective flexible hinge fastening solutions for global machinery, engineering and equipment manufacturers.
If you are looking for high-quality DIN444 swing eye bolts, Grade 8.8 hot dip galvanized eye bolts and stainless steel hinge bolts, feel free to contact us for professional technical support and accurate quotation.
