Hexagon Bolts DIN 931
Hexagon Bolts DIN 931 – Partially Threaded Metric Hex Bolts
Looking for DIN 931 hexagon bolts? Intergard supplies high-quality hex head bolts with a partially threaded shank for secure connections in steelwork, machinery, construction and general engineering. Available in zinc-plated steel grade 8.8 and stainless steel A2 or A4, these metric bolts are designed for reliable fastening with compatible nuts and washers.
Choose from a wide range of diameters and lengths, including M5, M6, M8, M10, M12 and M24. Ideal for professional installers, industrial users and trade customers. All prices are per 100 bolts. Wholesale enquiries welcome.
DIN 931 Hexagon Bolts for Construction, Engineering and Industrial Fastening
DIN 931 hexagon bolts are metric fasteners with an external hexagonal head and a partially threaded shank. They are widely used for joining components in steel construction, mechanical engineering, machinery assembly, metal fabrication and general industrial applications.
The distinctive feature of a DIN 931 bolt is its combination of a threaded section and an unthreaded shank. When correctly selected, the smooth shank can pass through the connected components while the threaded section engages with a suitable nut or tapped hole.
Intergard supplies partially threaded hex bolts in zinc-plated steel grade 8.8 and stainless steel A2 and A4. These different materials and finishes allow customers to select the appropriate fastener for their mechanical requirements and environmental conditions.
Our range includes metric diameters such as M5, M6, M8, M10, M12 and M24, with various lengths available. Whether you need bolts for construction, machinery, workshop repairs or professional assembly, Intergard offers a broad selection of DIN 931 fasteners.
All listed prices are per 100 bolts.
What Are DIN 931 Hexagon Bolts?
A DIN 931 hexagon bolt is a metric bolt with an external hexagonal head and a partially threaded shaft. It is designed for fastening components together using a compatible nut or a suitably threaded hole.
DIN 931 is the traditional German standard for hexagon head bolts with a partial thread. The corresponding international standard is ISO 4014, although dimensional differences may exist between standards and editions.
These bolts are commonly called hex bolts, hex head bolts, partially threaded hex bolts or metric hexagon bolts.
The hexagonal head allows installation with a suitable spanner or socket, making DIN 931 bolts practical for assembly, maintenance and industrial fastening.
Key Features of DIN 931 Hexagon Bolts
- External hexagonal head for tightening with a spanner or socket.
- Partially threaded metric shaft.
- Smooth shank section for suitable bolted connections.
- Available in zinc-plated steel and stainless steel.
- Steel grade 8.8 and stainless steel A2/A4 options.
- Suitable for use with compatible metric nuts and washers.
- Various diameters and lengths for different applications.
- Widely used in construction, engineering and industrial assembly.
- Suitable for professional trade and wholesale purchasing.
Why Choose DIN 931 Partially Threaded Hex Bolts?
1. Partially Threaded Design
The main characteristic of DIN 931 bolts is their partially threaded shank. A section of the bolt remains smooth, while the end is provided with a metric thread.
When the bolt length and connection geometry are correctly selected, the unthreaded shank can be positioned through the connected components.
This can be advantageous in certain bolted joints where the location of the shear plane and threaded section is important.
2. Hexagon Head for Practical Installation
The six-sided head allows DIN 931 bolts to be tightened using standard spanners, sockets and suitable torque tools.
The correct tool size and tightening method should always be used to avoid damaging the bolt head or connection.
3. Suitable for a Wide Range of Industries
DIN 931 hex bolts are widely used in metal fabrication, machinery, industrial maintenance, equipment assembly and construction.
Their suitability for a specific connection depends on the bolt material, property class, dimensions and applicable engineering requirements.
4. Choice of Material and Corrosion Protection
Intergard offers zinc-plated steel and stainless steel DIN 931 bolts, allowing customers to choose according to the required mechanical performance and environmental exposure.
Zinc-plated steel is commonly selected for suitable indoor industrial applications, while stainless steel offers additional corrosion resistance for environments where moisture is a concern.
Galvanized DIN 931 Hexagon Bolts – Steel Grade 8.8
Galvanized DIN 931 hexagon bolts are manufactured from steel and protected by an electrolytically applied zinc coating.
Intergard's product information identifies these bolts as property class 8.8, a commonly used metric fastener strength class for engineering and construction applications.
For property class 8.8 bolts, the nominal tensile strength is 800 MPa and the nominal yield-strength ratio is 0.8. Actual mechanical requirements and test values are governed by the applicable fastener standard.
Benefits of Zinc-Plated DIN 931 Bolts
- Steel property class 8.8 for suitable mechanical applications.
- Zinc coating helps protect against corrosion.
- Practical for many dry indoor and sheltered environments.
- Compatible with appropriately specified metric fastening components.
- Cost-effective for many industrial and construction applications.
Electrolytic zinc plating should not be confused with hot-dip galvanizing. The coating thickness and corrosion performance differ, so the actual product specification must be checked before use in exposed environments.
Stainless Steel DIN 931 Hexagon Bolts – A2 and A4
Stainless steel DIN 931 hexagon bolts are suitable for applications where corrosion resistance is important.
Intergard's product information includes A2 and A4 stainless steel versions. These grades are commonly used in fastening applications, but their suitability depends on the environment and the required mechanical properties.
A2 Stainless Steel DIN 931 Bolts
A2 stainless steel provides good general corrosion resistance and is suitable for many indoor and ordinary outdoor applications.
It is commonly used for equipment, metal fittings and other fastening applications where corrosion resistance is required.
A4 Stainless Steel DIN 931 Bolts
A4 stainless steel generally provides better resistance than A2 in certain chloride-containing environments.
It is often preferred for more demanding exposure conditions, although the exact suitability depends on chloride concentration, temperature and other environmental factors.
Important: A2 and A4 identify stainless steel grades, not complete mechanical strength classes. Where strength is critical, check the full designation, such as A2-70 or A4-70, on the individual product specification.
DIN 931 vs DIN 933 – What Is the Difference?
One of the most important distinctions when selecting metric hexagon bolts is the difference between DIN 931 and DIN 933.
| Feature | DIN 931 | DIN 933 |
|---|---|---|
| Head type | Hexagon head | Hexagon head |
| Thread | Partial thread | Full thread |
| Unthreaded shank | Normally present | Normally absent |
| Corresponding ISO standard | ISO 4014 | ISO 4017 |
| Typical selection criterion | Joint geometry requiring a smooth shank section | Applications requiring thread along most of the shaft |
DIN 931 bolts are commonly selected where a partially threaded design is required. DIN 933 bolts have a full thread and may be preferable when thread engagement is required along a greater proportion of the bolt length.
Explore our DIN 933 hexagon bolts to compare full-thread alternatives.
DIN 931 Hexagon Bolt Sizes – M5 to M24
Metric DIN 931 bolts are identified by their nominal thread diameter and bolt length.
For example, an M10 x 100mm DIN 931 bolt has a nominal thread diameter of 10mm and a length of 100mm, measured from beneath the hexagon head to the end of the bolt.
The supplied Intergard product range includes the following diameters.
M5 DIN 931 Hexagon Bolts
M5 bolts are suitable for appropriately designed smaller mechanical connections and equipment assemblies. Examples in the supplied range include M5 x 30mm, M5 x 40mm and M5 x 50mm.
M6 DIN 931 Hexagon Bolts
M6 hex bolts are widely used for suitable metal fittings, equipment assemblies and general fastening tasks. Examples include M6 x 40mm, M6 x 60mm, M6 x 80mm and M6 x 100mm.
M8 DIN 931 Hexagon Bolts
M8 partially threaded bolts are commonly selected for machinery, metal brackets and general engineering connections. Examples include M8 x 40mm, M8 x 60mm, M8 x 80mm, M8 x 100mm and M8 x 140mm.
M10 DIN 931 Hexagon Bolts
M10 bolts are suitable for larger connections where their dimensions and mechanical properties meet the design requirements. Examples include M10 x 50mm, M10 x 80mm, M10 x 100mm, M10 x 120mm and M10 x 160mm.
M12 DIN 931 Hexagon Bolts
M12 hexagon bolts are frequently used in suitably designed construction, machinery and metal fabrication applications. Examples include M12 x 70mm, M12 x 100mm, M12 x 120mm and M12 x 160mm.
M24 DIN 931 Hexagon Bolts
M24 bolts are used for substantial mechanical and industrial connections where the bolt dimensions and strength specification have been correctly determined.
Examples in the supplied range include M24 x 120mm, M24 x 130mm, M24 x 140mm and M24 x 150mm.
Important: The examples above are drawn from the supplied product listing. Individual dimensions may differ between galvanized and stainless steel versions.
How to Choose the Correct DIN 931 Bolt Length
The correct bolt length depends on the total thickness of the connected components, washer thickness, nut height and required thread engagement.
For partially threaded bolts, it is also essential to consider the position and length of the unthreaded shank.
Before selecting a DIN 931 bolt, check:
- The total thickness of the components being joined.
- The nominal bolt diameter.
- The required unthreaded shank length.
- The length of the threaded section.
- The thickness of any washers.
- The height and type of nut.
- The required thread engagement.
- The applicable installation and loading requirements.
A bolt that is too short may not provide sufficient thread engagement, while an excessively long bolt may interfere with surrounding components.
Which Nuts and Washers Are Suitable for DIN 931 Bolts?
DIN 931 bolts are commonly used with compatible metric nuts and washers. The thread size, material, mechanical strength and corrosion protection should be selected to suit the complete fastening assembly.
Hexagon Nuts DIN 934
DIN 934 hexagon nuts are a common choice for metric bolted connections.
Always match the thread diameter and pitch, and select a suitable nut property class for the bolt.
Lock Nuts DIN 985
DIN 985 lock nuts incorporate a non-metallic locking element designed to help resist loosening.
Check the temperature limits, mechanical requirements and suitability of the locking element before use.
Flat Washers DIN 125 A
DIN 125 A flat washers can provide a bearing surface beneath the bolt head or nut.
Select a washer with dimensions and mechanical properties suitable for the connection.
Large-Diameter Washers DIN 9021
DIN 9021 large-diameter washers provide a larger bearing area and may be useful where the connected material requires additional surface support.
Where Are DIN 931 Hexagon Bolts Used?
Steel Construction
Partially threaded hexagon bolts can be used in suitably designed steel connections where the bolt's dimensions, material and mechanical properties meet the relevant structural requirements.
For structural steelwork, ensure the complete bolting assembly is specified in accordance with the applicable standards and engineering design.
Mechanical Engineering
DIN 931 bolts are used in machinery assembly, equipment manufacturing and mechanical connections requiring metric fasteners.
Metal Fabrication
Hex head bolts are suitable for many connections involving metal plates, brackets, frames and fabricated components.
Industrial Maintenance
Maintenance teams use metric hexagon bolts for replacing suitable fasteners, assembling equipment and carrying out mechanical repairs.
Construction and Professional DIY
DIN 931 bolts are also used in construction-related installations and professional DIY projects where a compatible metric bolted connection is required.
How to Choose DIN 931 Hexagon Bolts in 8 Steps
- Identify the application: Determine whether the bolt will be used in machinery, steelwork, equipment or general assembly.
- Check the mechanical requirements: Establish the required bolt property class and loading conditions.
- Select the thread diameter: Choose the correct metric size, such as M6, M8, M10 or M12.
- Determine the bolt length: Allow for component thickness, washers, nuts and required thread engagement.
- Check the partial thread: Ensure the unthreaded shank and threaded section suit the connection geometry.
- Choose the material: Select zinc-plated steel or an appropriate stainless steel grade.
- Select compatible nuts and washers: Match thread dimensions, material and mechanical specifications.
- Verify the connection requirements: Check the applicable standards, tightening procedure and load capacity.
How to Install DIN 931 Hexagon Bolts Correctly
- Inspect the components: Ensure the connected parts and fixing holes are clean and correctly aligned.
- Check the bolt specification: Confirm the diameter, length, material and property class.
- Position the bolt: Insert the bolt through the aligned fixing holes without forcing it.
- Fit the required washers: Use suitable washers where specified by the connection design.
- Install the nut: Engage a compatible metric nut and ensure the threads turn freely.
- Tighten the connection: Use an appropriate spanner, socket or torque tool.
- Apply the specified tightening method: Follow the required torque or preload procedure where applicable.
- Inspect the completed connection: Check alignment, thread engagement and correct seating of the components.
Installation tip: Do not use a universal tightening torque for all DIN 931 bolts. The correct tightening procedure depends on the bolt property class, thread condition, lubrication, coating and connection design.
Common Mistakes When Selecting DIN 931 Hex Bolts
Confusing DIN 931 with DIN 933
DIN 931 bolts have a partial thread, while DIN 933 bolts have a full thread. Selecting the wrong design may result in unsuitable thread engagement or shank positioning.
Choosing an Incorrect Bolt Length
An incorrectly sized bolt may provide insufficient thread engagement or cause interference with adjacent components.
Mixing Incompatible Strength Classes
The bolt, nut and other fastening components must be mechanically compatible. Do not assume that all metric nuts are suitable for every bolt property class.
Using the Wrong Corrosion Protection
Electrolytically zinc-plated steel may not be suitable for exposed or aggressive environments. Check whether a different coating or stainless steel grade is required.
Applying Incorrect Tightening Torque
Excessive tightening can damage the fastener or connected components, while insufficient tightening may compromise the connection.
Frequently Asked Questions About DIN 931 Hexagon Bolts
What are DIN 931 hexagon bolts?
DIN 931 hexagon bolts are metric bolts with an external hexagonal head and a partially threaded shank. They are used for fastening components in machinery, construction, metal fabrication and engineering.
What is the difference between DIN 931 and DIN 933?
DIN 931 bolts have a partial thread and an unthreaded shank section. DIN 933 bolts have a full thread. The correct choice depends on the connection geometry and thread engagement requirements.
What is the ISO equivalent of DIN 931?
ISO 4014 is the corresponding international standard for partially threaded hexagon head bolts. Check the applicable dimensions and specifications before substituting one standard for another.
What does bolt grade 8.8 mean?
Property class 8.8 identifies a metric steel fastener strength class. It has a nominal tensile strength of 800 MPa and a nominal yield-strength ratio of 0.8.
Are stainless steel DIN 931 bolts available in A2 and A4?
Yes. Intergard's product information includes A2 and A4 stainless steel versions. Check the individual product listing for the exact material grade and mechanical strength designation.
Can DIN 931 bolts be used outdoors?
Yes, provided the bolt material or coating is suitable for the exposure conditions. Stainless steel and galvanized steel offer different levels of corrosion resistance depending on their specifications.
Which nuts fit DIN 931 bolts?
DIN 931 bolts require compatible metric nuts with the correct thread diameter, pitch and mechanical specification. DIN 934 hexagon nuts are one common option.
Are DIN 931 hexagon bolt prices per 100 pieces?
Yes. All listed prices for Intergard DIN 931 hexagon bolts are per 100 bolts.
Buy DIN 931 Hexagon Bolts at Intergard
Looking to buy DIN 931 hexagon bolts online? Intergard supplies quality partially threaded metric hex bolts for construction, machinery, engineering and general industrial fastening.
Choose from galvanized DIN 931 hex bolts and stainless steel DIN 931 hex bolts to find the right material and dimensions for your application.
Looking for a fully threaded alternative? Explore our DIN 933 hexagon bolts.
Complete your fastening assembly with suitable hexagon nuts and washers.
All listed prices are per 100 bolts.
Wholesale DIN 931 Hexagon Bolts for Trade Customers
Intergard has been an importer and wholesaler of garden products, hardware and fastening materials since 1997, supplying DIY retailers, garden centres, hardware merchants and professional resellers throughout Europe.
Are you a distributor, industrial supplier, hardware retailer or professional buyer looking to purchase DIN 931 hexagon bolts in bulk, by the pallet or by the truckload?
Send us your enquiry with the required metric sizes, lengths, material grades, quantities and delivery address. We will be pleased to prepare a competitive wholesale quotation tailored to your requirements.
Email: info@intergard.nl
Telephone: +31 546 579030
Order DIN 931 hexagon bolts from Intergard or request your wholesale quotation today.