DIN 931 Bolt
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DIN 931 Bolt – Precision Half-Threaded Hex Bolt for Industrial Applications
The DIN 931 Bolt is a precision-engineered fastener widely used in structural, mechanical, and industrial installations. Manufactured in accordance with the German DIN 931 standard, this bolt features a partially threaded shank and a hexagon head, making it ideal for high-strength clamping and load-bearing joints. The DIN 931 Bolt is highly regarded for its durability, reliability, and international compatibility across industries.
What is a DIN 931 Bolt?
The DIN 931 Bolt is a metric standard hex bolt with a partially threaded body. Unlike its fully threaded counterpart (DIN 933), the DIN 931 Bolt has a smooth, unthreaded portion beneath the head. This design allows the bolt to provide better shear resistance and superior alignment in bolted connections.
Engineered for precision, the DIN 931 Bolt comes in various diameters and lengths, offering solutions for both light-duty and heavy-duty applications.
Key Features of DIN 931 Bolt
? Partial Thread Design
The unthreaded section enhances mechanical strength in load-bearing applications. It is particularly useful when exact alignment and resistance to shear force are required.
? Hexagonal Head
The six-sided head allows for easy tightening using spanners, wrenches, or socket tools, ensuring secure fastening under torque.
? High-Grade Material Options
Available in stainless steel, carbon steel, and alloy steel, the DIN 931 Bolt can withstand extreme conditions and demanding environments.
? Metric Compliance
Conforming to DIN and ISO standards ensures that the DIN 931 Bolt is globally recognized and interchangeable with similar bolts.
Typical Applications
The DIN 931 Bolt is favored in industries requiring secure, stable, and long-lasting connections:
Construction – Steel frame joints, heavy-duty fixings, infrastructure projects
Machinery – Connecting machine parts and assemblies under dynamic loads
Automotive – Engine components, mounting brackets, chassis fasteners
Wind & Energy – Turbine and equipment assembly
Shipbuilding & Marine – Corrosion-resistant fastening in saltwater environments
The DIN 931 Bolt ensures structural integrity in applications that demand strength and stability.
Technical Specifications
| Attribute | Description |
|---|---|
| Standard | DIN 931 / ISO 4014 |
| Thread Type | Metric coarse/fine |
| Thread Coverage | Partial (typically 2/3 of bolt length) |
| Head Type | Hexagon head |
| Size Range | M5 to M64 (varies by length and material) |
| Material | Carbon steel, alloy steel, stainless steel |
| Finish | Plain, zinc-plated, black oxide, galvanized |
| Strength Grades | 8.8, 10.9, 12.9 (for alloy/carbon steel) |
Advantages of Using DIN 931 Bolt
Stronger shear performance due to unthreaded shank
Better component alignment in bolted joints
Ideal for dynamic loads where vibration resistance is needed
Available in multiple coatings to suit harsh and corrosive environments
Recognized globally, the DIN 931 Bolt ensures supply chain compatibility
DIN 931 Bolt vs DIN 933 Bolt
| Feature | DIN 931 Bolt | DIN 933 Bolt |
|---|---|---|
| Thread Type | Partial | Full thread |
| Shear Resistance | Higher | Moderate |
| Applications | Structural, load-bearing | Light to medium-duty |
| Alignment Support | Excellent | Limited |
For applications requiring precision, strength, and durability, the DIN 931 Bolt remains the preferred choice.
Conclusion
The DIN 931 Bolt stands out as a versatile, high-performance fastener that excels in applications demanding precision and durability. With its partial thread design and hex head structure, the DIN 931 Bolt ensures enhanced mechanical performance in high-load scenarios. Whether used in machinery, construction, automotive, or industrial engineering, the DIN 931 Bolt delivers unmatched reliability and global standard compliance.
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