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The DIN 931 DIN 933 Grade 8.8 Black Oxide Carbon Steel Hex Head Bolts are high-strength external hex bolts designed for machinery assembly, steel structure fastening, equipment installation, construction hardware, and general industrial applications.
These bolts are made from carbon steel and produced in Grade 8.8, providing reliable mechanical strength for demanding fastening work. The product range includes both DIN 931 partially threaded hex head bolts and DIN 933 fully threaded hex head bolts, making it suitable for different assembly requirements.
The Black Oxide Finish gives the bolts a uniform black appearance and provides basic surface protection. The hex head design allows installation with standard wrenches, sockets, or torque tools.
| Item | Specification |
|---|---|
| Product Name | Black Oxide Carbon Steel Hex Head Bolt |
| Standard | DIN 931 / DIN 933 |
| Strength Grade | Grade 8.8 |
| Material | Carbon Steel |
| Surface Treatment | Black Oxide Finish |
| Color | Black |
| Head Type | Hex Head |
| Thread Type | Metric Thread |
| Thread Design | Fully Threaded / Partially Threaded |
| Fastening Method | Used with Nut, Washer, or Threaded Hole |
| Application | Machinery, Construction, Steel Structure, Equipment Assembly |
| Standard | Thread Structure | Product Feature |
|---|---|---|
| DIN 931 | Partially Threaded | Has a smooth shank section and threaded end |
| DIN 933 | Fully Threaded | Thread runs along the full bolt body |
The product image shows a combination of both thread types: shorter bolts with full thread and longer bolts with partial thread. Therefore, DIN 931 / DIN 933 is a suitable product classification.
| Item | Description |
|---|---|
| Material | Carbon Steel |
| Grade | 8.8 |
| Finish | Black Oxide Finish |
| Appearance | Black surface |
| Main Function | Provides dark appearance and basic surface protection |
| Recommended Matching Parts | Hex nuts, flat washers, spring washers |
Black Oxide Finish is commonly used for carbon steel fasteners. It gives the bolt a black industrial appearance and helps reduce surface oxidation when used with proper storage and protective oil.
| Advantage | Description |
|---|---|
| High Strength Performance | Grade 8.8 carbon steel provides reliable fastening strength. |
| Two Thread Options | DIN 931 partial thread and DIN 933 full thread meet different assembly needs. |
| Easy Installation | Hex head design works with standard wrenches, sockets, and torque tools. |
| Industrial Appearance | Black oxide finish gives a clean black surface. |
| Stable Fastening | Suitable for machinery, equipment, steel structure, and construction use. |
| Matching Assembly | Can be used with nuts and washers for complete fastening solutions. |
| Application Area | Typical Use |
|---|---|
| Machinery Assembly | Machine frame fastening, equipment fixing, mechanical connection |
| Steel Structure | Steel plate connection, bracket fixing, frame assembly |
| Construction Hardware | Metal support parts, structural components, installation hardware |
| Industrial Equipment | Production equipment, maintenance, replacement fastening |
| Automotive & Mechanical Parts | Brackets, supports, chassis-related components |
| General Hardware | Repair, installation, and industrial fastening work |
| Part | Description |
|---|---|
| Hex Head | Provides tool contact surface for tightening |
| Bolt Shank | Supports positioning and load transfer |
| Threaded Section | Engages with nuts or internal threads |
| Black Oxide Layer | Creates black surface appearance |
| Carbon Steel Body | Provides strength and durability |
| Step | Recommendation |
|---|---|
| 1. Confirm Standard | Choose DIN 931 for partial thread or DIN 933 for full thread. |
| 2. Match Thread | Use matching metric nuts or threaded holes. |
| 3. Use Proper Tool | Tighten with a suitable wrench, socket, or torque tool. |
| 4. Add Washer if Needed | Flat washers help distribute load on the assembly surface. |
| 5. Store Properly | Keep black oxide bolts dry and protected to reduce rust risk. |
This product is a DIN 931 / DIN 933 Grade 8.8 black oxide carbon steel hex head bolt.
The material is carbon steel.
The strength grade is Grade 8.8.
The surface treatment is Black Oxide Finish.
DIN 931 is partially threaded, with a smooth shank and threaded end.
DIN 933 is fully threaded, with thread along the bolt body.
No. This product is described as carbon steel with Black Oxide Finish.
It can be installed with a wrench, socket, or torque tool that matches the hex head size.
It is commonly used with matching hex nuts, flat washers, and spring washers.
They are suitable for machinery, construction, steel structure, industrial equipment, automotive components, and general fastening applications.
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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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