Nuts · DIN 934
DIN 934 Hex Nut
Accurate Fastners manufactures and supplies DIN 934 hex nuts in stainless steel grades SS 202, SS 304 and SS 316, covering the diameter range M2.5 to M27. Cold forged to the DIN 934 standard, these nuts are suited to a wide range of industrial metric-threaded assemblies.
- Standard
- DIN 934
- Grades
- 304 / 316 / 202
- Size
- M2.5 – M27
- Length
- —
Overview
What is the DIN 934 Hex Nut?
DIN 934 is a widely recognised German standard that defines the dimensions, thread form and mechanical requirements for full hexagon nuts with a metric internal thread. The standard specifies exact across-flat widths, bearing face geometry and thread tolerances, allowing DIN 934 nuts to mate consistently with bolts and studs produced to the same metric system. Its broad adoption across European and internationally aligned manufacturing makes it a common specification in general engineering procurement.
The hex nut produced to DIN 934 features six flat faces arranged symmetrically around a central threaded bore, with chamfered bearing surfaces on both faces. This geometry allows the nut to be driven efficiently by standard open-end spanners, ring spanners and socket tools of the corresponding size. The metric internal thread engages along the full thickness of the nut, distributing clamping load across multiple thread flanks and helping to resist loosening under moderate vibration when used as part of a properly designed joint.
Accurate Fastners produces these nuts by cold forging, a process that forms the hexagonal profile from stainless steel rod or wire under high pressure without removing material. Cold forging typically refines the grain structure of the material, which may contribute to improved consistency in the finished part compared with machined alternatives. Each nut carries a metric internal thread formed to DIN 934 tolerances, and the product range spans M2.5 through M27, covering a broad spectrum of bolt diameters encountered in industrial equipment manufacture.
In Depth
Product description
Construction and Geometry
A DIN 934 hex nut is defined by its hexagonal outer profile, its overall height, and the width across flats, all of which are specified by the standard for each metric thread size. The through-bore carries a metric internal thread with a standardised pitch for each diameter. Both bearing faces are chamfered at the outer diameter, creating a small conical recess that centres the nut against a mating surface and reduces stress concentration at the contact edge.
Accurate Fastners produces these nuts by cold forging from stainless steel. In cold forging, the workpiece is shaped at or near room temperature using compressive dies, which densifies the material and produces a net-shape or near-net-shape hexagonal blank before threading. The result is a nut with consistent dimensional form across the production run. The thread is subsequently formed to the tolerances required by DIN 934, ensuring interchangeability with metric fasteners of the corresponding class.
Functional Behaviour in an Assembly
When tightened onto a bolt or stud, a DIN 934 hex nut converts applied torque into axial clamping force, holding the jointed components together. The load is shared across the engaged thread flanks, and the bearing face transmits compressive force to the surface beneath. Because the nut is a full-height type under DIN 934, it generally provides more thread engagement than thin or half-height alternatives, which may be relevant when selecting between nut types for a given application.
In stainless steel assemblies, it is common practice to apply a suitable lubricant to the threads before tightening to reduce the risk of galling, a phenomenon where stainless steel surfaces can adhere and seize under friction. Using calibrated torque tooling and following the fastener supplier's or design engineer's guidance on tightening procedure is advisable. The hex external drive allows accurate torque application using conventional tooling without requiring special socket profiles or insert bits.
How It Differs from Similar Fasteners
DIN 934 specifies the standard full-height hex nut. It differs from DIN 439, which covers thin (half-height) hex nuts intended for use as lock nuts or in confined spaces where overall height is restricted. It also differs from ISO 4032, which shares broadly similar dimensions but may carry slightly different mechanical property designations. Buyers specifying stainless steel nuts should confirm the precise standard required, as dimensional and property differences between related standards can affect interchangeability.
Compared with flange nuts or nylon-insert lock nuts, the plain DIN 934 hex nut relies on proper joint design, correct preload and, where needed, supplementary locking features such as spring washers or thread-locking compounds to maintain clamping in dynamic environments. Its simplicity is also its versatility: the standard hex profile is universally toolable and stocked in a wider grade and size range than many specialised nut forms, making it a practical baseline choice for metric-threaded industrial assemblies.
Material & Grade
Material and grade information
- SS 304
- SS 316
- SS 202
Accurate Fastners supplies DIN 934 hex nuts in three stainless steel grades: SS 202, SS 304 and SS 316. SS 304 is an austenitic grade widely used in general industrial applications where moderate corrosion resistance is required. SS 316 contains molybdenum, which typically provides improved resistance to chloride-containing environments compared with SS 304, making it a common choice where exposure to moisture, cleaning agents or mild chemical contact is a consideration. Grade selection should always be confirmed with the relevant design requirements.
SS 202 is a lower-nickel austenitic grade that may be suitable for less demanding environments or cost-sensitive applications where the corrosion conditions are mild. It is worth noting that all three grades are austenitic stainless steels and are generally non-magnetic in the annealed state, though cold working during forging may induce a slight magnetic response. Customers uncertain about grade selection for their specific environment or service conditions are advised to consult the Accurate Fastners sales team before finalising an order.
Grades shown are those documented for this product in the Accurate Fastners brochure. General material notes are guidance only; confirm grade selection for your environment.
Technical Data
Technical specifications
| Product type | Nut – DIN 934 Hex Nut |
|---|---|
| Material | Stainless steel |
| Material grade | SS 304, SS 316, SS 202 |
| Applicable standard | DIN 934 |
| Nominal diameter / size | M2.5 – M27 |
| Thread type | Metric internal thread |
| Head / form | Hexagon |
| Drive / tightening | External hex |
| Manufacturing process | Cold forged |
Sizes
Available sizes
Documented size range
M2.5 – M27
Documented length range
Not applicable
Individual sizes within the documented range, thread pitches and lengths are confirmed at quotation stage.
Applications
Industrial applications
Solar Energy Mounting Structures
DIN 934 hex nuts in SS 304 or SS 316 are commonly used to secure panel frames and rail assemblies in solar installations, where outdoor exposure requires reliable corrosion resistance over extended service periods.
Food and Beverage Processing Equipment
Stainless steel hex nuts are a common choice for hygienic machinery frames and guards in the food and beverage sector, where compatibility with cleaning regimes and resistance to product contamination are important design considerations.
Pharmaceutical Machinery
SS 316 DIN 934 hex nuts may be specified in pharmaceutical equipment assemblies where resistance to process chemicals and ease of cleaning are priorities. Grade selection should be confirmed against the specific process environment.
RO Water Purifier and Submersible Pump Assembly
Hex nuts to DIN 934 are used in the fabrication and maintenance of water treatment equipment and submersible pump housings, where wet conditions make stainless steel preferable to carbon steel alternatives.
LED Lighting and Electrical Enclosures
Compact sizes within the M2.5–M27 range suit the lighter structural assemblies found in LED lighting fixtures and electrical panel enclosures, where dimensional precision and consistent thread engagement are useful characteristics.
Featured for: RO Water Purifier, Submersible Pump, Pharmaceutical Machinery
Features & Selection
Features and selection considerations
Design features
Cold Forged Construction
Each nut is cold forged from stainless steel rod, producing a consistent hexagonal profile and potentially refined grain structure compared with machined parts, with minimal material waste in the manufacturing process.
Full Metric Internal Thread
The through-bore carries a metric internal thread to DIN 934 tolerances, ensuring interchangeability with standard metric bolts and studs across the M2.5 to M27 diameter range supplied.
Standard Hex External Drive
Six flat bearing faces allow the nut to be driven by commonly available open-end, ring or socket spanners, avoiding the need for proprietary tooling and simplifying assembly and maintenance operations.
Chamfered Bearing Faces
Both faces carry a chamfer at the outer diameter as specified by DIN 934, which helps centre the nut during tightening and distributes bearing load more evenly against the mating surface.
Three Stainless Steel Grade Options
Availability in SS 202, SS 304 and SS 316 allows customers to select a grade matched to their corrosion environment and budget, with guidance available from the Accurate Fastners sales team.
Before you order
Thread Diameter and Pitch
Confirm the nominal thread diameter (M2.5–M27) and metric pitch required by your design. DIN 934 specifies the coarse pitch series; if a fine pitch is needed, please confirm with the sales team before ordering.
Material Grade
Choose between SS 202, SS 304 and SS 316 based on your service environment, exposure to moisture or chemicals, and any applicable project specification. The Accurate Fastners team can assist with grade comparisons if required.
Mating Fastener Compatibility
Ensure the bolt, stud or threaded rod to be used carries the same metric thread standard and tolerance class. Mismatched thread forms or standards may affect engagement quality and joint performance.
Quantity and Documentation
Provide the required quantity, packaging preference and any documentation needs such as material test reports or delivery certificates when submitting your enquiry, to allow Accurate Fastners to prepare an accurate and complete quotation.
FAQs
Frequently asked questions
What does DIN 934 specify for hex nuts?
DIN 934 is a German standard defining the dimensions, across-flat widths, bearing face geometry and thread tolerances for full hexagon nuts with a metric internal thread. It is widely referenced in industrial fastener procurement across many countries.
Which stainless steel grades are available for your DIN 934 hex nuts?
Accurate Fastners supplies DIN 934 hex nuts in SS 202, SS 304 and SS 316. Each grade offers different corrosion resistance characteristics. Please contact the sales team to discuss which grade best suits your application environment.
What size range do you stock for DIN 934 hex nuts?
The available diameter range is M2.5 to M27. If your project requires a size outside this range or a specific fine-pitch variant, please raise an enquiry with the sales team to confirm feasibility and availability.
Can these nuts be used with any metric bolt?
DIN 934 hex nuts carry a metric internal thread and are generally interchangeable with metric bolts and studs of the same nominal diameter and pitch. Always verify that the mating fastener carries the same thread standard and tolerance class before assembly.
Do you supply related fasteners such as bolts, washers or thread bars to go with these nuts?
Yes. Accurate Fastners manufactures and supplies a broad range of fasteners including bolts, washers, thread bars and other related products. Contact the sales team to discuss a combined supply of mating components for your project.
How can I request a quotation for DIN 934 hex nuts?
You can submit your requirements through the enquiry form on the website, send details to export@accuratefastners.com, or reach the team via WhatsApp. Please include grade, size, quantity and any documentation requirements for a prompt response.
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