DIN 933 / DIN 931 Black Hex Bolts and Nuts
DIN 933 / DIN 931 black hex bolts and nuts are widely used fastening components for industrial and engineering connections. With a standard hex head design, the bolts can be tightened efficiently using common wrenches, sockets, and installation tools.
This product range is designed to support different strength requirements, from general‑purpose fastening to higher‑load mechanical assemblies. Buyers can select the required grade, material, diameter, length, and finish according to the operating environment and connection demand.
The main material is carbon steel, including 35K and 45# carbon steel options. Carbon steel provides a dependable balance of mechanical strength, processing performance, and cost control, making it suitable for wholesale distribution, equipment manufacturing, construction supply, and OEM projects.
Key Features
- DIN 933 / DIN 931 standard hex bolt and nut design
- Available strength grades from 4.8 to 12.9
- Main material options: 35K carbon steel and 45# carbon steel
- Black oxide surface finish
- Hex head for convenient installation and removal
- Suitable for bolt‑and‑nut fastening assemblies
- Length options available from 10 mm to 300 mm
- Suitable for machinery, construction, equipment, and industrial maintenance
- Supports bulk purchasing, OEM supply, and customized packaging
Product Specifications
| Item | Specification |
|---|---|
| Brand | Hotop Fasteners |
| Origin | Handan, Hebei, China |
| Standard | DIN 933 / DIN 931 |
| Product Type | Hex Bolt and Nut Set |
| Available Strength Grades | 4.8 / 6.8 / 8.8 / 10.9 / 12.9 |
| Main Material | Carbon Steel |
| Material Options | 35K Carbon Steel / 45# Carbon Steel |
| Surface Finish | Black Oxide |
| Head Type | Hex Head |
| Length Range | 10 mm to 300 mm |
| Color | Black |
| Application | Machinery, construction, industrial equipment, steel structures, general fastening |
Strength Grade Options
| Grade | Recommended Use |
|---|---|
| Grade 4.8 | General‑purpose fastening and standard hardware applications |
| Grade 6.8 | Medium‑strength mechanical and assembly applications |
| Grade 8.8 | Industrial machinery, equipment assembly, and structural fastening |
| Grade 10.9 | Heavy‑duty mechanical connections requiring higher tensile strength |
| Grade 12.9 | High‑load applications requiring excellent fastening strength |
Material Details
35K Carbon Steel
35K carbon steel is commonly used for fastener production because it provides practical strength and stable forming performance. It is a suitable option for standard industrial bolts and nuts used in machinery, construction, and hardware supply.
45# Carbon Steel
45# carbon steel is a stronger material option for fasteners requiring improved mechanical performance. It is often selected for higher‑strength bolt grades and applications exposed to increased load or tightening force.
Black Oxide Surface Finish
The black oxide treatment gives bolts and nuts a dark, uniform appearance suitable for industrial and mechanical products. This finish is often selected for machinery components, equipment assemblies, maintenance parts, and general hardware applications. For projects with different environmental requirements, surface treatment and final finish can be discussed according to the intended application.
DIN 933 and DIN 931 Standards
| Standard | Product Structure | Typical Application |
|---|---|---|
| DIN 933 | Fully threaded hex bolt | Suitable for connections requiring thread engagement along the bolt length |
| DIN 931 | Partially threaded hex bolt | Suitable for structural and mechanical assemblies requiring an unthreaded shank section |
Applications
DIN 933 / DIN 931 black hex bolts and nuts are suitable for:
- Machinery manufacturing
- Industrial equipment assembly
- Construction fastening
- Steel structure installation
- Mechanical maintenance
- Agricultural machinery
- Automotive equipment
- Hardware distribution
- OEM component supply
- General engineering projects
Packaging and Custom Supply
Hotop Fasteners supports bulk supply and order‑based packaging solutions for distributors, project contractors, and industrial buyers. Available services include:
- Bulk packaging
- Carton packaging
- Pallet packaging
- Export‑ready packing
- Customized logo service
- Customized packaging
- Size and length selection
- OEM and drawing‑based supply
FAQ
Q1: What strength grades are available for these hex bolts and nuts?
Available strength grades include 4.8, 6.8, 8.8, 10.9, and 12.9.
Q2: What materials are available?
The main material is carbon steel, including 35K carbon steel and 45# carbon steel options.
Q3: What is the surface finish?
The standard appearance is a black oxide finish.
Q4: What is the difference between DIN 933 and DIN 931?
DIN 933 is commonly used for fully threaded hex bolts, while DIN 931 is commonly used for partially threaded hex bolts.
Q5: What bolt lengths can be supplied?
Lengths from 10 mm to 300 mm can be supplied according to the selected diameter and specification.
Q6: Can I order both bolts and nuts together?
Yes. Bolt‑and‑nut sets can be supplied based on your required specification.
Q7: Can you provide custom packaging or a private label?
Yes. Hotop Fasteners supports customized packaging, logo service, and OEM supply for suitable bulk orders.
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