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DIN 917 provides a recognized designation for a low-style hexagon cap nut. Referencing the standard helps define the general product form, but it does not replace the need to state the ordered thread size, pitch, material designation and inspection scope.
A complete B2B order should identify:
DIN 917 as the product standard;
nominal thread diameter;
thread pitch;
material and property-class marking;
required dimensions or standard-table compliance;
cap clearance relative to bolt projection;
surface condition;
test and certificate requirements;
quantity and packaging.
The upper end is enclosed by a compact cap. This keeps the mating thread end inside the nut when the bolt or stud projection is correctly selected.
Six external flats provide a conventional wrenching interface. The correct tool size depends on the ordered DIN 917 dimension and cannot be measured from the image.
The underside contains the female thread used to engage a corresponding male thread. Correct diameter, pitch, tolerance and engagement are necessary for safe assembly.
The sample carries an A2-70 marking on the bearing face. Marking location and content should be included in the purchasing specification if identification and traceability are required.
RFQ field | Information to provide or confirm |
|---|---|
Product | DIN 917 Hexagon Cap Nut |
Style | Low-style closed-end hexagon cap nut |
Thread system | Metric thread expected from DIN designation; exact size and pitch required |
Material marking | A2-70 visible on the supplied sample |
Material | A2 stainless steel |
Property class | 70 |
Thread size | Not provided |
Thread pitch | Not provided; coarse or fine pitch must be stated |
Dimensions | Confirm against DIN 917 for the ordered size |
Internal cap clearance | Confirm against mating bolt or stud projection |
Surface appearance | Bright metallic appearance visible |
Separate finish or coating | Not confirmed |
Torque | Not provided; joint-specific value required |
Certificates | State required documents before quotation |
Packaging | State quantity, labeling and export requirements |
WF Fastener’s relevant DIN 917 product listing identifies a fine-pitch A2 stainless-steel version. The attached image, however, does not allow the thread pitch to be measured. The buyer must therefore state whether the order requires coarse or fine pitch rather than relying on the photograph.
Confirm:
nominal diameter;
pitch;
thread tolerance;
mating-bolt thread;
thread-gauge requirement;
minimum engagement;
bolt-end projection;
whether samples are required for fit testing.
A correct nominal diameter with the wrong pitch is not interchangeable.
Cap clearance is a critical selection point. Before ordering, calculate or measure the length of bolt or stud projecting beyond the clamped components.
The selected nut must allow:
sufficient mating-thread engagement;
adequate clearance inside the closed cap;
full seating of the nut against the joint surface or washer;
application of the specified clamp load without internal bottoming.
If the threaded end contacts the inside of the cap too early, the torque reading may increase without producing the intended joint clamp load.
Subject to engineering approval, DIN 917 cap nuts may be selected for:
exposed bolted joints requiring a closed end;
machinery covers and guards;
furniture and hardware assemblies;
railings and visible frames;
equipment panels;
brackets and general industrial fixtures;
enclosures and external fittings;
OEM products where joint appearance is important.
The product should not be assigned to structural, lifting, pressure, food-contact, marine, hygienic or other regulated applications without separate confirmation of the complete specification.
The A2-70 marking supports the material and property-class designation of the pictured sample. The image does not confirm whether the nut has undergone passivation, polishing or another finishing operation.
The RFQ should state:
A2 stainless-steel requirement;
property class 70;
required material standard or certificate;
surface condition;
passivation or polishing requirement, if any;
appearance criteria;
corrosion-test requirement, if any;
mating-fastener material;
service environment;
lot traceability.
Do not substitute A4, carbon steel, plated steel or another material without buyer approval.
Confirm the nut and mating fastener have the same nominal thread and pitch.
Verify that the thread projection fits within the cap clearance.
Inspect the nut thread and bolt or stud for contamination or damage.
Check the joint surface and washer arrangement, where applicable.
Start the nut by hand.
Apply the correctly sized wrench or socket to the external hexagon.
Tighten using the joint-specific torque procedure.
Stop and investigate if the nut binds before reaching the joint surface.
Confirm final seating and clamp condition.
Record inspection or torque data when required by the quality plan.
No installation torque is provided by the image or product name. Tightening depends on thread size, mating-fastener class, surface condition, lubrication and required preload.
For stainless-steel threaded assemblies, purchasing and assembly teams should define:
mating material;
lubrication policy;
tightening method;
installation speed;
torque limits;
anti-galling controls, if required;
replacement criteria after thread damage or seizure.
These are application controls, not confirmed product properties.
A B2B inspection plan may include:
confirmation of DIN 917 product form;
verification of A2-70 marking;
nominal thread and pitch checks;
go/no-go thread gauging;
across-flats measurement;
overall height and cap-depth measurement;
bearing-face inspection;
closed-cap integrity;
visual examination for dents, cracks, burrs and damaged threads;
material-document review;
surface-condition comparison with the approved sample;
quantity, label and lot verification.
Inspection limits and sampling levels must be agreed in the purchase order.
For bulk orders, specify:
pieces per bag or box;
net and gross weight limits;
part-number and thread-size labels;
A2-70 identification on packaging;
lot or batch information;
barcode requirements;
moisture protection;
carton and pallet configuration;
customer branding;
destination and transport method.
Packaging availability and cost should be confirmed during quotation.
Confirmed | Requires confirmation |
|---|---|
DIN 917 product designation | Exact thread size |
Closed low cap form | Coarse or fine pitch for this pictured item |
External hexagon | Across-flats dimension |
Internal female thread | Thread tolerance and depth |
Visible A2-70 marking | Material certificate scope |
Bright metallic appearance | Passivation, polishing or coating process |
Closed-end function | Internal clearance for the selected size |
Wrench installation | Tightening torque |
No. DIN 917 identifies a specific low-style cap-nut form. Other dome nuts may follow different standards and dimensions.
No. Although WF Fastener lists a DIN 917 fine-pitch A2 stainless-steel product, the pitch of the pictured nut cannot be measured visually. State the required pitch in the RFQ.
No self-locking mechanism is shown or specified. Use a separately approved locking method if the joint requires anti-loosening performance.
No. A2-70 is a material/property-class designation, not a coating description.
Use the DIN 917 dimensions for the ordered thread size and verify that the mating bolt or stud projection fits within the available internal clearance.
No. Torque is determined by the complete joint, including thread size, mating fastener, surface condition, lubrication and required preload.
For a precise quotation, provide the DIN 917 thread size, pitch, quantity, required A2-70 marking, mating bolt or stud information, cap-clearance requirement, certificates, surface condition, packaging and destination.
