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

Global Shipping Available.
OEM & Custom Manufacturing.
Large-Volume Orders Supported.
Tender & Project Order Support.
Multiple Surface Finishes.
Strict Quality Control.
Material Certificates Available.

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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 Grado 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

Item	Especificación
Product Name	Black Oxide Carbon Steel Hex Head Bolt
Estándar	DIN 931 / DIN 933
Strength Grade	Grado 8.8
Material	Carbon Steel
Tratamiento de superficies	Black Oxide Finish
Color	Black
Tipo de cabeza	Hex Head
Tipo de hilo	Metric Thread
Thread Design	Fully Threaded / Partially Threaded
Fastening Method	Used with Nut, Washer, or Threaded Hole
Aplicación	Machinery, Construction, Steel Structure, Equipment Assembly

DIN 931 vs DIN 933

Estándar	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.

Material and Surface Finish

Item	Descripción
Material	Carbon Steel
Calificación	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.

Product Advantages

Advantage	Descripción
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.

Common Applications

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

Product Structure

Part	Descripción
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

Installation Notes

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.

Preguntas frecuentes

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 Grado 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?

DIN 931 is partially threaded, with a smooth shank and threaded end.
DIN 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.

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