Electro-Galvanized Zinc Plated DIN933 ASTM490 Hex Bolt Nut Washer 8.8 .10.9 Grade
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Electro-galvanized zinc plated DIN933 hex bolts, nuts and washers provide exceptional corrosion resistance and mechanical strength for demanding industrial applications. These fasteners are manufactured to meet both DIN933 and ASTM490 standards, ensuring international compliance and quality.
Available in high-strength grades 8.8, 10.9, and 12.9, these fastener sets offer the perfect balance between corrosion protection and load-bearing capacity. The electro-galvanized zinc plating provides a uniform, durable coating that protects against rust and corrosion in various environments.
Superior Corrosion Protection
Electro-galvanized zinc plating provides excellent rust and corrosion resistance for extended service life.
High Strength Grades
Available in 8.8, 10.9, and 12.9 strength grades to meet various load requirements.
International Standards
Compliant with DIN933 (German) and ASTM490 (American) standards for global acceptance.
Complete Fastener Sets
Includes hex bolts, nuts, and washers for convenient procurement and installation.
Complete Fastener Sets
Includes hex bolts, nuts, and washers for convenient procurement and installation.
Grade 8.8 – Medium Carbon Steel, Quenched & Tempered
Grade 8.8 is the most commonly used high-strength bolt grade, offering an excellent balance between strength, ductility, and cost-effectiveness. These bolts are suitable for general structural applications where high strength is required.
| Property | Specification | Application Benefit |
|---|---|---|
| Material | Medium Carbon Steel (Quenched & Tempered) | Good strength with reasonable ductility |
| Tensile Strength | 800 MPa (116,000 psi) min | High load-bearing capacity |
| Yield Strength | 640 MPa (93,000 psi) min | Good resistance to permanent deformation |
| Elongation | 12% min | Adequate ductility for most applications |
| Hardness | HRC 22-32 | Balanced hardness for strength and toughness |
| Primary Applications | General construction, machinery, automotive, structural steel connections, equipment assembly | |
Grade 10.9 – Alloy Steel, Quenched & Tempered
Grade 10.9 bolts are made from alloy steel and offer higher strength than Grade 8.8. They are used in applications where higher clamping forces or resistance to dynamic loads are required.
| Property | Specification | Application Benefit |
|---|---|---|
| Material | Alloy Steel (Quenched & Tempered) | Higher strength than carbon steel |
| Tensile Strength | 1000 MPa (145,000 psi) min | Very high load-bearing capacity |
| Yield Strength | 900 MPa (130,500 psi) min | Excellent resistance to permanent deformation |
| Elongation | 9% min | Sufficient ductility for high-strength applications |
| Hardness | HRC 32-39 | Higher hardness for increased strength |
| Primary Applications | Heavy machinery, high-pressure piping, structural connections, automotive suspensions, critical equipment assembly | |
Grade 12.9 – Alloy Steel, Quenched & Tempered
Grade 12.9 represents the highest strength grade commonly available for metric bolts. These bolts are used in the most demanding applications where maximum strength and minimum size/weight are critical.
| Property | Specification | Application Benefit |
|---|---|---|
| Material | Alloy Steel with Special Treatment | Maximum strength with controlled ductility |
| Tensile Strength | 1200 MPa (174,000 psi) min | Maximum load-bearing capacity |
| Yield Strength | 1080 MPa (156,600 psi) min | Exceptional resistance to permanent deformation |
| Elongation | 8% min | Controlled ductility for ultra-high strength |
| Hardness | HRC 39-44 | Maximum hardness for highest strength |
| Primary Applications | Aerospace, high-performance automotive, precision machinery, critical structural connections, high-stress applications | |
Complete Fastener Set Components
Our electro-galvanized zinc plated fastener sets include all necessary components for complete assembly.
Hex Bolts (DIN933 / ASTM490)
High-strength hex head bolts with full or partial threading. Available in metric sizes M6 to M36 and equivalent imperial sizes. Manufactured from carbon steel or alloy steel depending on grade requirements.
Hex Nuts (DIN934 / ASTM563)
Heavy hex nuts designed to match bolt strength grades. Available in coarse and fine thread configurations. Compatible with 8.8, 10.9, and 12.9 grade bolts.
Washers (DIN125 / ASTM F436)
Flat washers that distribute load and protect surfaces. Available in standard and heavy series. Electro-galvanized zinc plating provides corrosion protection matching the bolts and nuts.
Industrial Applications
Electro-galvanized zinc plated hex bolt nut washer sets are used across multiple industries for reliable fastening solutions.
Construction & Structural Steel
Used in steel frame construction, bridges, building structures, and architectural metalwork where corrosion resistance and high strength are essential.
Machinery & Equipment Manufacturing
Essential for assembly of industrial machinery, agricultural equipment, material handling systems, and processing equipment.
Automotive & Transportation
Used in vehicle assembly, chassis components, trailer manufacturing, and transportation equipment where vibration resistance is critical.
Infrastructure & Utilities
Critical for power transmission towers, utility structures, telecommunications equipment, and public works projects exposed to weather conditions.
Advantages of Electro-Galvanized Zinc Plating
Superior Corrosion Protection
Electro-galvanized zinc plating creates a sacrificial layer that protects the base metal from rust and corrosion, even if the coating is scratched or damaged.
Uniform Coating Thickness
Electroplating ensures consistent zinc coating thickness across all surfaces, including threads, providing reliable protection without compromising dimensional tolerances.
Excellent Electrical Conductivity
Zinc plating maintains good electrical conductivity, making these fasteners suitable for applications requiring electrical grounding or continuity.
Cost-Effective Protection
Electro-galvanizing provides excellent corrosion protection at a lower cost compared to stainless steel or hot-dip galvanizing for many applications.
International Standards Compliance
DIN933 – German Standard
Specifies hexagon head bolts with thread lengths according to ISO 4014 and ISO 4017. Our bolts comply with dimensional and mechanical requirements.
ASTM490 – American Standard
Specifies heat-treated alloy steel bolts with tensile strength of 150,000 psi min. Our Grade 10.9 and 12.9 bolts meet or exceed these requirements.
ISO 898-1 – International Standard
Specifies mechanical properties of bolts, screws and studs. Our 8.8, 10.9, and 12.9 grade fasteners comply with ISO 898-1 requirements.
ISO 9001:2015 Quality Management
Our manufacturing processes are certified to ISO 9001:2015 standards, ensuring consistent quality and traceability.
Technical Specifications
Complete technical data for electro-galvanized zinc plated hex bolt nut washer sets.
Dimensions & Sizes
- Bolt Diameters: M6 to M36 (1/4″ to 1-1/2″)
- Thread Types: Metric coarse, Metric fine, UNC, UNF
- Length Range: 20mm to 300mm (3/4″ to 12″)
- Nut Sizes: Matches bolt diameters
- Washer Sizes: Matches bolt diameters
Coating Specifications
- Coating Type: Electro-galvanized zinc plating
- Coating Thickness: 5-15 μm (0.2-0.6 mils)
- Salt Spray Resistance: 72-240 hours (ASTM B117)
- Color: Bright silver (can be chromated for yellow/blue)
- Hydrogen Embrittlement: Baking after plating
Material Specifications
- Bolt Material: Carbon steel (8.8) / Alloy steel (10.9/12.9)
- Nut Material: Carbon steel / Alloy steel
- Washer Material: Carbon steel
- Heat Treatment: Quenched & tempered
- Traceability: Full material certification available
Strength Grade Selection Guide
| Strength Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Typical Use | Cost Factor |
|---|---|---|---|---|
| Grade 8.8 | 800 | 640 | General construction, machinery | 1.0x (baseline) |
| Grade 10.9 | 1000 | 900 | Heavy machinery, structural | 1.3-1.5x |
| Grade 12.9 | 1200 | 1080 | High-performance, aerospace | 1.8-2.5x |
Electro-Galvanized Zinc Plated Fasteners
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