Standards and Specifications
| Applicable Standard | German DIN 934-1987 (equivalent to International Standard ISO 4032 and Chinese National Standard GB/T 6170) |
| Performance Grade | Grade 8.8 High Strength (carbon steel / alloy steel, guaranteed stress ≥640 MPa, tensile strength ≥800 MPa, yield strength ≥640 MPa) |
| Product Grade | ≤M16 is Grade A (High Precision), >M16 is Grade B (General Precision) |
| Thread Specifications | Metric coarse-thread M3–M64 (commonly used in industry: M5–M36) |
| Thread Tolerance | 6H (standard internal thread tolerance, compatible with Grade 8.8 and higher bolts) |
| Surface Treatment | Black oxide, electrogalvanized (blue-white zinc / colored zinc), hot-dip galvanized, phosphated (optional) |
Key Product Features
High Load-Bearing Capacity, Safe and Reliable
DIN 934 Grade 8.8 hex nuts are manufactured from medium-carbon steel or alloy steel that has undergone quenching and tempering (hardening + high-temperature tempering). Their strength is more than twice that of Grade 4.8 nuts. They can withstand high tensile, shear, and vibration loads, making them suitable for critical structural fastening applications.
German Standard Precision, Globally Compatible
Our products strictly adhere to DIN 934 standard dimensions, with precise tolerances for hexagon face-to-face dimensions, thickness, and thread accuracy. They are fully interchangeable with mainstream global standard fasteners and compatible with various imported equipment, construction machinery, and steel structure assemblies.
Premium Materials, Exquisite Craftsmanship
Crafted from carefully selected high-quality 35# steel, 45# steel, or 40Cr alloy steel, our products undergo cold heading and precision tapping. The threads feature a complete profile with no burrs, ensuring a secure, slip-free lock. Post-heat treatment, they exhibit uniform hardness and excellent toughness.
Corrosion-Resistant, Durable, and Versatile
Multiple surface treatments are available. With strong rust resistance in standard environments, these fasteners are suitable for harsh conditions such as indoor and outdoor industrial equipment, vehicles, bridges, and heavy machinery. They remain rust-free and reliable even after long-term use.
Applications
Designed specifically for high-strength fastening applications, these products are widely used in:
- Automotive manufacturing (engines, chassis, frames)
- Construction machinery, mining equipment, and heavy machinery
- Steel structures in construction, bridge engineering, and tower crane equipment
- Shipbuilding, rail transportation, pressure vessels
- Power facilities, machine tools, industrial molds
- All high-load assembly applications requiring 8.8-grade / 10.9-grade bolts
Purchasing and Service Information
- Material Standards: Complies with GB/T 3098.2 (Mechanical Properties of Fasteners), Grade 8.8 special carbon steel / alloy steel
- Quality Assurance: Hardness and tensile strength testing conducted on all batches; material certificates and factory inspection reports provided
- Packaging: Standard cardboard boxes / steel drums; small-packaging options available upon customer request
- Stock Sizes: Large quantities of standard sizes (M3–M36) in stock; custom sizes available upon request
- Application Recommendations: Must be used in conjunction with bolts of Grade 8.8 or higher to ensure matching connection strength
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