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DIN 933 Hex Head Bolt

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DIN 933 Hex Head Bolt Specification

Head Type
Hex

Thread Type
Metric

Surface Treatment
Polishing

Corrosion Resistant
Yes

Finish
Buffed

Drive Type
Hex

Fasteners Type
Bolts

Material
Stainless Steel

Color
Self Finish

About DIN 933 Hex Head Bolt

The Stainless Steel DIN 933 Hex Head Bolt is a heavy-duty, fully threaded industrial fastener engineered for high-strength securing and fastening applications. Unlike the DIN 931 variant which features a partial thread, the DIN 933 bolt is threaded along its entire shank length up to the underside of the hexagonal head (dimensionally identical to ISO 4017). This design provides a strong, reliable hold and allows the bolt to be tightened deeply into pre-tapped holes.

Key Features & Design

Fully Threaded Shank: Threads run completely from the tip to the underside of the head. This allows full engagement throughout the entry hole and ensures tight, secure clamping even in shallow holes.

Hexagonal Drive: The six-sided head allow maximum torque transfer using standard wrenches, spanners, or socket tools.

Precision Metric Threads: Formulated to standard metric coarse pitches with a standard 6g thread tolerance class for a smooth, reliable fit.

Clean Appearance: Stainless steel offers a smooth, bright aesthetic finish that resists rust bleeding and staining on visible surfaces.

Material Grades & Specifications

DIN 933 bolts are manufactured in premium grade austenitic stainless steels, offering excellent longevity without additional plating:

A2 Stainless Steel (Grade 304): The standard commercial grade. It offers high resistance to corrosion under typical outdoor atmospheric conditions, washing, and everyday moisture.

A4 Stainless Steel (Grade 316): Marine-grade stainless steel. Formulated with molybdenum, it prevents pitting and corrosion in harsh saltwater, chemical processing, and acidic environments.

Property Class: Most commonly delivered in Class 70 (e.g., A2-70, A4-70), guaranteeing a high minimum tensile strength of 700 MPa.

Technical Parameters

Size Range: Widely available in metric diameters from M3 up to M64.

Bolt Lengths: Available in shorter total lengths than DIN 931 bolts, as the continuous threading allows them to function efficiently in compact, thin-material assemblies.

Target Applications & Industries

Because they can be fully inserted into tapped holes without a smooth shank stopping them, DIN 933 bolts are common in:

Machinery & Automation: Securing motors, gearboxes, pumps, and factory assembly lines.

Water Treatment & Chemical Plants: Joining pipe flanges, tanks, and chemical mixing units where corrosion resistance is mandatory.

Marine & Coastal Engineering: Used on boats, docks, and offshore oil platforms (specifically in A4 grade) to resist salt damage.

Construction & Architectural Facades: Fixing brackets, structural plates, and outdoor cladding where long-term material integrity is required.

Superior Strength and Protection

Manufactured from stainless steel, these DIN 933 Hex Head Bolts are resistant to rust and corrosion, making them suitable for both indoor and outdoor applications. The buffed, polished surface adds to their longevity and visual appeal, ensuring that they remain functional and presentable even in harsh environments.

Precision Engineering for Demanding Projects

Each bolt features metric threading and a tightly machined hex head, facilitating secure installation with standard hex wrenches. Their robust construction offers peace of mind for structural, mechanical, or fabricative uses, supporting heavy loads and minimizing the risk of failure.

FAQ's of DIN 933 Hex Head Bolt:

Q: How are DIN 933 Hex Head Bolts installed?

A: DIN 933 Hex Head Bolts are installed using a standard hex wrench or socket, which fits securely onto the hexagonal head, allowing for firm tightening in a variety of applications.

Q: What are the benefits of the buffed, self finish with polished surface treatment?

A: The buffed, self finish and polished surface provide enhanced corrosion resistance, prevent oxidation, and deliver an attractive appearance, making these bolts ideal for both functional and visible uses.

Q: When should I use stainless steel DIN 933 Hex Head Bolts?

A: You should use these bolts whenever high strength, corrosion resistance, or a clean finish is required-such as in marine, construction, automotive, or architectural applications.

Q: Where are DIN 933 Hex Head Bolts typically applied?

A: These bolts are commonly used in machinery assembly, structural fabrication, infrastructure, and outdoor installations due to their durability and resistance to harsh elements.

Q: What is the manufacturing process for these bolts?

A: The bolts are manufactured through precision forging and threading processes, followed by buffing and polishing to achieve a smooth, self finish and maximum corrosion resistance.

Q: How does the metric thread type benefit users?

A: Metric threads ensure compatibility with a wide range of international components and systems, simplifying installation and maintenance across global industries.

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