Product Overview

DIN 933 / ISO 4017 Full Thread Hex Head Bolts are one of the most widely used metric fastening solutions in industrial and structural applications. Designed with a fully threaded shank and external hexagonal head, these bolts provide reliable clamping force, easy installation, and compatibility with standard metric nuts and washers.

Manufactured from high-quality carbon steel materials and available in multiple property classes including Grade 4.8, 8.8, and 10.9, these hexagon bolts are suitable for a broad range of mechanical fastening requirements. Various surface finishes such as Zinc Plated, Yellow Zinc, Black Oxide, Hot Dip Galvanized (HDG), Dacromet, and Geomet are available to improve corrosion resistance and service life under different environmental conditions.

DIN 933 corresponds closely to ISO 4017, making these bolts internationally recognized and interchangeable in many industrial markets.

Key Features

• Fully threaded design for maximum thread engagement
• Standard metric hex head for easy installation
• Available in multiple carbon steel grades
• Wide range of anti-corrosion surface finishes
• High dimensional accuracy and thread consistency
• Compatible with standard metric nuts and washers
• Suitable for OEM and industrial assembly applications
• Available in coarse and fine thread options
• Manufactured according to DIN 933 / ISO 4017 standards

Product Specifications

DIN 933 vs ISO 4017

DIN 933 and ISO 4017 are highly similar standards covering metric fully threaded hex head bolts. In most commercial and industrial applications, the two standards are considered interchangeable.

Available Material Grades

Grade 4.8 Carbon Steel

Grade 4.8 bolts are manufactured from low carbon steel and are commonly used in light-duty fastening applications requiring moderate mechanical strength.

Characteristics

• Economical solution
• Good machinability
• Suitable for general assembly

Grade 8.8 High Tensile Carbon Steel

Grade 8.8 is one of the most commonly used high-strength bolt grades in industrial manufacturing.

Characteristics

• High tensile strength
• Excellent mechanical performance
• Widely used in machinery and structural assemblies

Grade 10.9 Alloy Enhanced Carbon Steel

Grade 10.9 bolts provide significantly higher tensile and yield strength compared to Grade 8.8.

Characteristics

• High load-bearing capability
• Excellent fatigue resistance
• Suitable for demanding mechanical fastening systems

Mechanical Properties

Surface Finish Options

Zinc Plated

Electro zinc plated bolts provide basic corrosion resistance and a clean metallic appearance suitable for indoor or dry environments.

Advantages

• Economical
• Smooth surface finish
• Good appearance

Yellow Zinc

Yellow zinc plating adds additional passivation treatment for improved corrosion resistance and a gold-colored appearance.

Advantages

• Better corrosion resistance than standard zinc plating
• Decorative appearance

Black Oxide

Black oxide coating provides a dark surface finish with mild corrosion resistance and reduced light reflection.

Advantages

• Minimal dimensional impact
• Professional industrial appearance

Hot Dip Galvanized (HDG)

HDG bolts are coated with a thick zinc layer through hot-dip galvanizing for superior outdoor corrosion protection.

Advantages

• Excellent rust resistance
• Long outdoor service life
• Thick protective zinc coating

Dacromet Coating

Dacromet is a water-based zinc-aluminum flake coating system designed for high corrosion resistance without hydrogen embrittlement risks.

Advantages

• Salt spray resistance
• Environmentally friendly
• Suitable for high-strength bolts

Geomet Coating

Geomet is an advanced zinc-aluminum flake coating technology offering superior corrosion resistance and environmental performance.

Advantages

• Excellent corrosion resistance
• Chromium-free coating system
• Suitable for automotive and industrial applications

Manufacturing Process

Cold Forging

Smaller sizes are generally manufactured through cold heading processes to achieve:

• High production efficiency
• Excellent dimensional consistency
• Smooth surface quality

Hot Forging

Large diameter bolts are commonly hot forged for:

• Improved material flow
• Better structural integrity
• Heavy-duty applications

Quality Control

Each production batch typically undergoes:

• Raw material inspection
• Mechanical property testing
• Thread gauge inspection
• Surface coating thickness testing
• Salt spray corrosion testing
• Dimensional verification
• Hardness testing

Common Size Range

Packaging Options

• Small box packing
• Bulk carton packing
• Pallet export packaging
• Customer private label packaging
• OEM barcode labeling

Advantages of Full Thread Hex Head Bolts

• Maximum thread engagement
• Better adjustability
• Strong clamping performance
• Easy installation with standard tools
• Broad compatibility with industrial fastener systems

FAQ

What is the difference between DIN 933 and ISO 4017?

Both standards describe fully threaded metric hex head bolts. ISO 4017 is the international equivalent of DIN 933, and they are generally interchangeable in most applications.

What is the difference between Grade 8.8 and Grade 10.9?

Grade 10.9 bolts offer significantly higher tensile and yield strength than Grade 8.8 bolts, making them suitable for higher load and heavy-duty fastening requirements.

Which coating provides the best corrosion resistance?

Hot Dip Galvanized, Dacromet, and Geomet coatings typically provide superior corrosion resistance compared to standard zinc plating.

Are these bolts fully threaded?

Yes. DIN 933 / ISO 4017 bolts feature a full thread design along the entire shank length.

Can custom sizes and coatings be manufactured?

Yes. Custom diameters, lengths, thread types, surface finishes, and packaging solutions are commonly available for OEM and bulk industrial orders.

Are these bolts available in fine thread?

Yes. Both coarse thread and fine thread metric versions can be produced depending on customer requirements.

What industries commonly use these bolts?

These bolts are widely used in machinery manufacturing, metal fabrication, equipment assembly, automotive components, industrial systems, and general engineering applications.

Conclusion

DIN 933 / ISO 4017 Full Thread Hex Head Bolts are versatile, internationally standardized fastening components widely used across industrial manufacturing sectors. Available in multiple carbon steel grades and corrosion-resistant finishes, these metric hexagon bolts provide reliable mechanical performance, dimensional consistency, and long-term durability for professional fastening systems.

With extensive customization options covering material grades, coatings, dimensions, and packaging, these bolts remain one of the most essential fastening solutions for global industrial supply chains.