Grade 8.8 DIN 933 / DIN 931 High Tensile Black Oxide Hex Head Bolts
The Grade 8.8 DIN 933 / DIN 931 High Tensile Black Oxide Hex Head Bolt is a commonly used industrial fastener designed for strong and secure mechanical connections. It is widely selected for equipment manufacturing, steel structure installation, construction fastening, machinery repair, and hardware distribution.
The bolt is manufactured from carbon steel, offering a good balance of strength, durability, and commercial value. The Grade 8.8 strength level makes it suitable for applications requiring higher tensile performance than ordinary low‑grade bolts.
Two thread styles are available:
- DIN 933: Full thread hex head bolt
- DIN 931: Partial thread hex head bolt
The black oxide finish gives the bolt a clean industrial appearance and is commonly used for mechanical assembly, indoor equipment, and general fastening applications.
Key Features
- Grade 8.8 high tensile strength for demanding fastening applications
- DIN 933 and DIN 931 standards available for different assembly requirements
- Carbon steel material for dependable mechanical performance
- Black oxide finish for a clean, professional surface appearance
- Hex head design for easy tightening with standard tools
- M6‑M48 size range to support multiple project and distribution needs
- Suitable for industrial, construction, machinery, and OEM applications
Product Specifications
| Item | Specification |
|---|---|
| Product Type | Hex Head Bolt |
| Standard | DIN 933 / DIN 931 |
| Strength Grade | Grade 8.8 |
| Material | Carbon Steel |
| Surface Finish | Black Oxide |
| Thread Type | Full Thread / Partial Thread |
| Head Type | Hex Head |
| Size Range | M6‑M48 |
| Brand | Hotop Fasteners |
| Origin | Handan, Hebei, China |
| Application | Machinery, construction, steel structures, equipment assembly, general fastening |
DIN 933 and DIN 931 Options
Different projects may require different thread lengths. This product supports both common DIN hex bolt types.
| Standard | Thread Style | Typical Use |
|---|---|---|
| DIN 933 | Full Thread | Suitable for applications requiring full thread engagement and adjustable fastening depth |
| DIN 931 | Partial Thread | Suitable for structural connections where the unthreaded shank helps improve alignment and shear performance |
Material and Grade
These bolts are made from carbon steel and supplied in Grade 8.8 strength class.
Grade 8.8 bolts are widely used in medium‑to‑heavy‑duty fastening applications. They are suitable for buyers who need better strength performance than standard low‑grade bolts while still keeping the product practical for bulk purchasing and regular industrial use.
Surface Finish
The standard surface finish is black oxide.
Black oxide is often selected for industrial fasteners because it provides a neat dark appearance and works well for many mechanical and assembly environments. For buyers with different market or project requirements, surface treatment options can be discussed according to the final order specifications.
Applications
Grade 8.8 DIN 933 / DIN 931 hex head bolts are suitable for a wide range of fastening applications, including:
- Machinery manufacturing
- Equipment assembly
- Construction fastening
- Steel structure connection
- Mechanical maintenance
- Hardware distribution
- Automotive and agricultural machinery repair
- General industrial projects
- OEM fastening supply
Why Choose This Hex Head Bolt
This product is designed for buyers who need a strong, widely used, and easy‑to‑source fastening solution.
The combination of DIN standard, Grade 8.8 strength, carbon steel material, and black oxide finish makes it suitable for many industrial purchasing scenarios. Whether you are sourcing for project installation, wholesale distribution, equipment manufacturing, or regular stock replenishment, this bolt offers a practical and dependable option.
Packaging and Custom Supply
Packaging can be arranged according to customer requirements, including bulk packing, carton packing, pallet packing, or customized export packaging.
For distributors and project buyers, Hotop Fasteners can support specification confirmation, mixed‑size orders, and supply planning based on purchasing needs.
FAQ
Q1: What is the difference between DIN 933 and DIN 931?
DIN 933 is generally a full thread hex head bolt, while DIN 931 is generally a partial thread hex head bolt. The right choice depends on the fastening depth, connection structure, and application requirement.
Q2: What material is used for this bolt?
This bolt is made from carbon steel.
Q3: What does Grade 8.8 mean?
Grade 8.8 is a high tensile strength class commonly used for industrial bolts. It is suitable for applications that require stronger fastening performance than ordinary low‑grade bolts.
Q4: What surface finish does this product have?
The main finish is black oxide.
Q5: What sizes are available?
The available size range is M6‑M48.
Q6: Can I choose full thread or partial thread?
Yes. DIN 933 full thread and DIN 931 partial thread options are available.
Q7: Is this product suitable for bulk orders?
Yes. This product is suitable for distributors, wholesalers, project buyers, OEM customers, and industrial supply chains.
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