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DIN 931 Zinc Plated Carbon Steel Hex Head Bolts are partially threaded metric fasteners designed for machinery assembly, steel structure connection, equipment installation, construction hardware, and general industrial fastening.
This product features a hex head, carbon steel body, zinc plated surface, and partially threaded shank. Compared with fully threaded bolts, the DIN 931 partial thread design includes a smooth shank section, which helps improve positioning and provides stable support in assembled parts.
For buyers, this product solves a common procurement problem: choosing the correct bolt type when the application requires a smooth shank plus threaded end, not a fully threaded DIN 933 bolt.
| Item | Description |
|---|---|
| Product Name | DIN 931 Zinc Plated Carbon Steel Hex Head Bolt |
| Standard | DIN 931 |
| Material | Carbon Steel |
| Surface Treatment | Zinc Plated |
| Surface Color | Silver Zinc |
| Head Type | Hex Head |
| Thread Design | Partially Threaded |
| Thread Type | Metric Thread |
| Body Structure | Smooth Shank + Threaded End |
| Fastening Method | Used with Nut, Washer, or Threaded Hole |
| Product Category | Hex Bolt / Partially Threaded Bolt / Metric Fastener |
| Purchasing Problem | How This Product Helps |
|---|---|
| Wrong standard selection | DIN 931 is clearly used for partially threaded hex bolts. |
| Confusion with DIN 933 | DIN 931 has a smooth shank section, while DIN 933 is fully threaded. |
| Need for stable positioning | The smooth shank helps keep parts aligned during assembly. |
| Need for surface protection | Zinc plating helps protect the carbon steel surface from oxidation. |
| Tool compatibility | Hex head design works with standard wrenches, sockets, and torque tools. |
| Assembly matching | Can be paired with matching metric nuts and washers. |
| Standard | Thread Type | Main Difference |
|---|---|---|
| DIN 931 | Partially Threaded | Has a smooth shank and threaded end |
| DIN 933 | Fully Threaded | Thread runs along the full bolt body |
This product is DIN 931, because it has a clear smooth shank section between the hex head and the threaded part.
The bolt is made from carbon steel, which is widely used in industrial fasteners for practical strength and cost-effective performance.
The zinc plated finish gives the bolt a silver metallic appearance and provides surface protection for general industrial use.
| Material | Surface Finish | Appearance | Function |
|---|---|---|---|
| Carbon Steel | Zinc Plated | Silver Metallic | Helps improve surface protection and appearance |
| Part | Function |
|---|---|
| Hex Head | Allows tightening with wrench, socket, or torque tool |
| Smooth Shank | Helps with alignment, positioning, and stable assembly |
| Threaded End | Provides fastening engagement with nut or threaded hole |
| Zinc Plated Layer | Protects the carbon steel surface |
| Carbon Steel Body | Provides durable fastening performance |
| Application Area | Typical Use |
|---|---|
| Machinery Assembly | Machine frames, equipment bodies, mechanical connections |
| Construction Hardware | Steel brackets, support plates, installation components |
| Steel Structure | Metal frame connection and structural component fastening |
| Automotive & Repair | Brackets, chassis-related parts, maintenance fastening |
| Industrial Equipment | Production equipment, fixing systems, replacement bolts |
| Metal Fabrication | Steel plates, fabricated frames, hardware assembly |
When purchasing DIN 931 zinc plated carbon steel hex bolts, buyers should confirm the following information before ordering:
| Required Information | Why It Matters |
|---|---|
| Diameter | Ensures the bolt fits the hole and nut |
| Length | Determines assembly thickness compatibility |
| Thread Length | Important for partial thread engagement |
| Material | Confirms carbon steel requirement |
| Surface Finish | Confirms zinc plated appearance and protection |
| Quantity | Affects quotation, packing, and delivery planning |
| Matching Parts | Nuts and washers may be required for complete assembly |
| Step | Recommendation |
|---|---|
| Check Standard | Use DIN 931 when a partially threaded bolt is required. |
| Match Thread | Use compatible metric nuts or threaded holes. |
| Use Proper Tool | Tighten with a matching wrench or socket. |
| Add Washer | Use washers when load distribution is required. |
| Check Assembly | Ensure the smooth shank and threaded section fit the application correctly. |
A DIN 931 bolt is a metric hex head bolt with a partially threaded shank. It has a hex head, smooth shank section, and threaded end.
This bolt is made from carbon steel.
The surface treatment is zinc plated.
No. This is a partially threaded bolt.
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. DIN 931 hex bolts are commonly used with matching metric nuts and washers.
It is suitable for machinery assembly, construction hardware, steel structure connection, equipment installation, 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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