DIN 931 DIN 933 Grade 8.8 Black Oxide Carbon Steel Hex Head Bolts Fully and Partially Threaded

Product Description

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 Класс 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.

Key Features

• DIN 931 and DIN 933 hex head bolt series
• Grade 8.8 high-strength carbon steel
• Black Oxide Finish surface treatment
• External hex head for easy tightening
• DIN 931 partially threaded structure
• DIN 933 fully threaded structure
• Suitable for machinery, construction, steel structure, and industrial fastening
• Used with matching nuts and washers

Product Specifications

DIN 931 vs DIN 933

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.

Material and Surface Finish

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.

Product Advantages

Common Applications

Product Structure

Installation Notes

Часто задаваемые вопросы

1. What is this product?

This product is a DIN 931 / DIN 933 Grade 8.8 black oxide carbon steel hex head bolt.

2. What is the material?

The material is carbon steel.

3. What is the strength grade?

The strength grade is Класс 8.8.

4. What is the surface treatment?

The surface treatment is Black Oxide Finish.

5. What is the difference between DIN 931 and DIN 933?

ДИН 931 is partially threaded, with a smooth shank and threaded end.
ГОСТ 933 is fully threaded, with thread along the bolt body.

6. Is this a stainless steel bolt?

No. This product is described as carbon steel with Black Oxide Finish.

7. What tools are used for installation?

It can be installed with a wrench, socket, or torque tool that matches the hex head size.

8. What parts are usually used together with this bolt?

It is commonly used with matching hex nuts, flat washers, and spring washers.

9. Where can these bolts be used?

They are suitable for machinery, construction, steel structure, industrial equipment, automotive components, and general fastening applications.