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The product is identified as a DIN 917 hexagon cap nut. DIN 917 defines a low-style closed hexagon cap-nut form. Exact dimensions depend on the ordered thread size and must be checked against the applicable standard table or approved product drawing.
The nut has a visibly closed upper end. When properly matched to the mating fastener, this cap covers the threaded end instead of leaving it exposed.
The six external flats allow the nut to be installed and removed using a correctly sized wrench or socket. The required across-flats dimension cannot be determined from the image.
The underside contains a continuous internal thread for engagement with a compatible bolt, screw or stud. The image does not identify the nominal thread diameter, pitch, tolerance class or thread depth.
The face marking A2-70 is visible in the supplied image. This marking is relevant to material group and property class, but it does not by itself confirm every chemical, dimensional or testing requirement for a purchase order.
Specification | Confirmed information |
|---|---|
Product name | DIN 917 Hexagon Cap Nut |
Standard designation | DIN 917 |
Form | Low-style closed hexagon cap nut |
Wrenching feature | External hexagon |
Thread | Internal female thread visible |
Marking | A2-70 visible |
Material designation | A2 stainless steel, based on the visible marking and supplied product context |
Property class | 70, based on the visible A2-70 marking |
Surface appearance | Bright metallic appearance visible |
Separate surface treatment | Not confirmed |
Thread size and pitch | Not provided |
Dimensions | Not provided |
Installation torque | Not provided |
Testing and certificates | Not provided |
The closed cap is designed to enclose the projecting end of a correctly selected mating fastener. This creates a more finished joint than an open nut with visible thread projection.
Covering the thread end can reduce direct contact with the sharp or rough edges of a projecting bolt or stud. The nut should not be presented as a safety guard unless the complete assembly has been evaluated for that purpose.
The low-profile closed form is suitable where joint appearance matters and where the fastener end should not remain visible.
The external hexagon permits installation with standard wrenching tools sized for the ordered nut.
Subject to thread, dimensional and engineering confirmation, DIN 917 cap nuts may be considered for:
equipment covers and external panels;
machine guards and brackets;
furniture and fixture assemblies;
handrails and exposed framework;
enclosure hardware;
general industrial assemblies;
visible bolted joints requiring a finished appearance;
connections where an exposed thread end should be covered.
These examples describe common functional uses of closed cap nuts. They do not confirm suitability for structural, pressure, lifting, high-temperature, food-contact, marine or safety-critical service.
Correct selection requires more than matching the nominal diameter. The buyer should confirm:
thread diameter;
thread pitch;
thread tolerance;
available internal thread depth;
bolt or stud projection beyond the joint;
washer thickness, if used;
required thread engagement;
clearance between the fastener end and the inside of the cap;
mating-fastener material and property class.
If the bolt or stud projects farther than the cap’s internal clearance, the nut may bottom against the fastener end before the joint is clamped correctly.
The visible A2-70 marking supports identification as an A2 stainless-steel fastener with property class 70. No additional coating can be confirmed from the image.
For B2B orders, specify:
required A2 stainless-steel designation;
required property class;
thread size and pitch;
surface condition or finishing requirement;
appearance acceptance criteria;
cleaning or passivation requirement, if applicable;
certificate and traceability requirements;
service environment and mating materials.
Do not describe the product as chrome plated, zinc plated, nickel plated, mirror polished or passivated unless these processes are confirmed in supplier documentation.
Verify the DIN 917 nut size and mating thread.
Check that the bolt or stud projection is compatible with the cap’s internal depth.
Inspect both threads for damage, debris or contamination.
Start the nut by hand to reduce the risk of cross-threading.
Ensure sufficient thread engagement before tightening.
Use a correctly sized wrench or socket on the external hexagon.
Tighten according to the approved joint specification.
Do not continue tightening if the nut bottoms against the fastener end.
Inspect the final seating and confirm that the joint is clamped as intended.
The image and product name do not provide an installation torque. Torque must be established for the exact thread, mating fastener, lubrication condition and joint design.
Depending on the purchase specification, inspection may include:
thread go/no-go gauging;
nominal thread diameter and pitch verification;
across-flats measurement;
overall height and cap-depth inspection;
closed-end integrity;
marking verification;
visual inspection for cracks, burrs and thread damage;
material and property-class documentation;
surface-condition inspection;
packaging and lot-traceability checks.
DIN 917 identifies the product form but does not confirm the ordered size.
The cap nut is not automatically self-locking.
The closed end does not replace a locking washer, prevailing-torque nut or other locking method where one is required.
Do not allow the mating bolt or stud to bottom inside the cap before clamp load is achieved.
Do not infer a separate coating from the bright metallic appearance.
Do not publish an unsupported tightening torque or load rating.
Confirm material compatibility where stainless-steel threaded components are paired together.
It is a low-style closed hexagon nut designed to thread onto a compatible bolt, screw or stud while covering the fastener end.
The visible marking identifies an A2 stainless-steel fastener with property class 70. Purchase requirements should still state the applicable material, property class and documentation.
No self-locking feature is visible or provided. If resistance to loosening is required, the joint must use an approved locking method.
The image shows a bright metallic surface, but no polishing or plating process can be confirmed.
The supplied image does not provide a size range. Confirm the required nominal diameter, pitch and availability during quotation.
No. The projecting thread length must fit within the available internal cap clearance while still providing sufficient thread engagement and joint clamp load.
Provide the DIN 917 thread size and pitch, required A2-70 designation, quantity, mating-fastener information, surface condition, documentation, packaging and destination for technical and commercial confirmation.
