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Dome Nut / Acorn Nut
A capped hexagon nut that covers the exposed end of a bolt or stud.
Reference: DIN 1587 high-type cap nut
Quick Specifications — Dome Nut / Acorn Nut
| Product | Dome Nut / Acorn Nut |
|---|---|
| Standard / drawing reference | DIN 1587 high-type cap nut |
| Thread / size | Specify nominal diameter, metric pitch or inch TPI, thread series, tolerance and handedness. Metric and inch products need their respective specified standards or drawings. |
| Material / strength | Specify material grade separately from nut strength class, proof-load or product-specific test requirements. See the enquiry table below. |
| Critical dimensions / selection | Usable internal thread depth, bolt protrusion, dome clearance and seating face. |
| Finish | Specify plain, passivated or coated finish as applicable to the selected material and nut design. Confirm coating/thread-fit compatibility. |
| Quantity / documentation | State quantity, delivery location, drawing revision and required inspection or material/test documentation. |
No numeric size range, load rating, stock availability or compliance is implied by this reference page. Requirements are reviewed before quotation.
Stainless steel & special-alloy grade enquiries
State the exact material grade in your RFQ. The following are enquiry options, not a stock list or certification claim. Suitability, manufacturing route and availability require confirmation for this nut design.
| Material requested | Technical information to confirm |
|---|---|
| SS 304 / 304L | Exact material specification; stainless nut grade and strength class where applicable. |
| SS 316 / 316L | Corrosion environment, specified material and required mechanical properties. |
| SS 310 / 310S | Exact grade, service temperature and mechanical requirements; no automatic high-temperature approval. |
| SS 904L | Stainless steel grade request; corrosion environment and applicable product/test specification. |
| HASTELLOY family | Exact alloy designation, material specification and certificate requirements. |
| Alloy 20 | Exact specification, service environment and product-form requirements. |
| MONEL family | Exact alloy designation and required mechanical/product specification. |
| INCONEL family | Exact alloy designation, service temperature and product/test specification. |
ISO 3506-2 stainless nut designations and property classes are separate from commercial SS grade names. Do not infer nut proof load from “SS 304” or “SS 316”, or copy bolt classes such as 8.8/10.9 onto a nut specification. Carbon/alloy steel requests need their own specified nut grade and mechanical requirements.
ISO 3506-2 stainless nut mechanical-property scope
Technical Selection & Standard Reference
DIN 1587 refers to high-type hexagon cap nuts. Other dome profiles must be ordered to their own drawing; the name alone does not establish cap height or usable internal thread depth.
Check before ordering: Usable internal thread depth, bolt protrusion, dome clearance and seating face.
References describe the product family, not certification of a supplied item. Specify the current or contractually required edition; confirm any legacy DIN reference against the actual drawing.
Application Areas
Visible equipment assemblies, guards, handrails and enclosed fastener ends where the joint design permits.
For oil & gas, pharma, dairy or construction projects, state the actual load, corrosion, hygiene, temperature and approval requirements. Sector names alone do not establish suitability.
Frequently Asked Questions
Why must bolt protrusion be checked with a dome nut?
The bolt can bottom against the closed cap before the nut clamps the joint. Specify usable internal thread depth and bolt protrusion together.
How do I request a quotation for dome nut / acorn nut?
Send the nut type, thread diameter and pitch, quantity, material grade, strength or test requirements, standard edition or drawing, finish, application and delivery location. Technical suitability and availability are confirmed with the quotation.
Request a Quote — Dome Nut / Acorn Nut
Send diameter × pitch/TPI, quantity, grade, strength/test requirements, standard or drawing, finish and delivery location. Attach your drawing or bill of materials to the enquiry.
Related categories are enquiry suggestions, not a statement of automatic compatibility.