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The DIN 931 Yellow Zinc Plated Carbon Steel Hex Head Bolt Partially Threaded Fastener is a standard metric hex bolt designed for reliable fastening in machinery, construction, steel structures, equipment assembly, metal fabrication, and general industrial applications.
This bolt is manufactured from carbon steel and features a hexagonal head, partially threaded shank, and yellow zinc plated surface finish. The hex head allows easy installation with standard wrenches, sockets, or torque tools. The partially threaded design includes a smooth shank section and a threaded end, making it suitable for applications that require stable positioning and strong fastening engagement.
The yellow zinc plating provides a gold-colored protective surface that helps improve corrosion resistance and gives the bolt a recognizable industrial appearance.
| Item | Specification |
|---|---|
| Product Name | DIN 931 Hex Head Bolt |
| Standard | DIN 931 |
| Material | Carbon Steel |
| Surface Treatment | Yellow Zinc Plated |
| Head Type | Hex Head |
| Thread Design | Partially Threaded |
| Thread Type | Metric Thread |
| Body Structure | Smooth Shank + Threaded End |
| Surface Color | Yellow / Gold Zinc Finish |
| Application | Machinery, Construction, Steel Structure, Equipment Assembly |
| Fastening Method | Used with Matching Nut or Threaded Hole |
| Part | Description |
|---|---|
| Hex Head | Allows tightening with a wrench, socket, or torque tool |
| Smooth Shank | Provides accurate positioning and stable support in the assembly |
| Threaded End | Engages with a nut or internal thread for fastening |
| Yellow Zinc Layer | Provides surface protection and yellow-gold appearance |
| Carbon Steel Body | Offers practical strength and durability for industrial use |
The bolt is made from carbon steel, a widely used material for industrial fasteners. Carbon steel provides good mechanical performance and is suitable for general fastening applications.
The surface is treated with yellow zinc plating, which forms a protective coating on the bolt surface. This finish helps reduce oxidation and provides a yellow-gold appearance.
| Material | Surface Finish | Appearance | Main Benefit |
|---|---|---|---|
| Carbon Steel | Yellow Zinc Plated | Yellow / Gold Metallic | Surface protection and improved appearance |
| Advantage | Description |
|---|---|
| Standard Design | DIN 931 provides a recognized dimensional standard for partially threaded hex bolts. |
| Easy Installation | Hex head design is compatible with common installation tools. |
| Stable Assembly | Smooth shank section helps improve positioning in assembled parts. |
| Secure Fastening | Threaded end provides reliable engagement with nuts or threaded holes. |
| Surface Protection | Yellow zinc plating helps protect the carbon steel surface. |
| Wide Application | Suitable for machinery, construction, equipment, and metal assembly. |
DIN 931 yellow zinc plated carbon steel hex bolts are widely used in industrial and construction fastening projects.
| Industry | Typical Application |
|---|---|
| Machinery | Machine frame assembly, equipment fixing, mechanical connection |
| Construction | Steel brackets, support plates, structural components |
| Steel Structure | Metal frame connection, beam and plate fastening |
| Automotive | Brackets, chassis-related components, repair fastening |
| Industrial Equipment | Installation, maintenance, and heavy-duty assembly |
| Metal Fabrication | Fabricated parts, welded frames, steel components |
DIN 931 and DIN 933 are both common hex head bolt standards, but their thread designs are different.
| Standard | Thread Design | Main Feature |
|---|---|---|
| DIN 931 | Partially Threaded | Has a smooth shank section and threaded end |
| DIN 933 | Fully Threaded | Thread runs along the full bolt body |
This product is DIN 931, which means it has a partially threaded structure.
| Step | Recommendation |
|---|---|
| 1. Check Size | Confirm the bolt diameter, length, and thread match the assembly requirement. |
| 2. Prepare Hole | Ensure the hole diameter is suitable for the bolt shank and thread. |
| 3. Match Nut | Use a matching metric nut if the bolt is not installed into a tapped hole. |
| 4. Tighten Properly | Use a suitable wrench, socket, or torque tool. |
| 5. Final Check | Confirm the bolt is seated correctly and the connection is secure. |
| Matching Item | Function |
|---|---|
| Hex Nut | Provides threaded locking connection |
| Flat Washer | Helps distribute load and protect the surface |
| Spring Washer | Helps improve resistance to loosening |
| Bolt-Nut-Washer Set | Provides a complete fastening solution |
A DIN 931 bolt is a metric hex head bolt with a partially threaded shank. It has a hexagonal head, a smooth shank section, and a threaded end.
This bolt is made from carbon steel.
The surface treatment is yellow zinc plating.
No. This is a partially threaded bolt. The body includes a smooth shank section and a threaded end.
DIN 931 is partially threaded. DIN 933 is fully threaded.
It can be installed with a wrench, socket, or torque tool that matches the hex head size.
Yes. This bolt is commonly used with matching metric nuts and washers.
It is used in machinery, construction, steel structures, equipment assembly, metal fabrication, and general industrial fastening.
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Complies with major global standards such as ISO/DIN/GB/ANSI/JIS
Standard parts + customized parts, one-stop solution for all your fastening needs
Tolerance control far exceeds industry standards, ranging from 4.8 to 12.9 grades.
Customization based on provided drawings/samples/working conditions; rapid prototyping and mass production delivery.
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International Organization for Standardization (ISO) standards
German Industrial Standards
Chinese National Standards
American National Standards
Japanese Industrial Standards
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