TECHNICAL LIBRARY · ISO STAINLESS NUTS
ISO 3506-2:2020 — Stainless Steel Nuts
Procurement reference for corrosion-resistant stainless nuts with specified grades, property classes and proof-load control.
Edition control: ISO 3506-2:2020 is the third edition, April 2020, confirmed in 2025. Check the authorised text and order requirements before use.
Scope in Procurement
ISO 3506-2 specifies mechanical and physical properties for corrosion-resistant stainless nuts with defined grades and property classes, metric threads and proof-load requirements when tested at 10 to 35 °C.
Ambient temperature for property testing: 10 to 35 °C ISO 3506-2:2020; ISO. Test conditions for the specified stainless nuts. Not a service-temperature limit; performance outside the test conditions requires separate assessment. Source: ISO 3506-2:2020: test conditions for stainless nuts (Edition 3, 2020-04; public abstract; confirmed 2025; checked 2026-10-19, p. Public abstract: tensile method scope or ambient test conditions). Reviewed: 2026-10-19.
RFQ and Finished-Fastener Controls
- Nut style, dimensions and dimensional standard
- Metric thread size, pitch, tolerance and fit
- Stainless grade and ISO 3506-2 property class
- Nut height, loadability and mating-fastener requirements
- Required proof-load, hardness or other tests
- Surface finish, marking and packaging
- Lot identity and inspection-document requirements
A raw-material certificate does not establish finished-fastener compliance. The report must trace the finished lot, tests and marking to the exact standard and order.
Scope Boundary
ISO 3506-2 does not by itself specify torque/clamp-force behaviour, prevailing torque or weldability. Nut compatibility must be checked against the exact bolt, screw or stud and joint requirements.
Related MNK Technical Pages
Official Publication and Access Policy
Check the official record for ISO 3506-2:2020. Protected grade tables, property values, dimensions and test clauses are not reproduced on this website.
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Technical Sources & Revision
Source: ISO. ISO 3506-2:2020
Document / edition: ISO 3506-2:2020
Source used for: The public ISO catalogue record supports the document identity, publication status and scope summary on this page. It is used for the stated material or product coverage and the named classification, inspection or test method, where applicable. It does not establish numerical acceptance limits or certify a supplied product.
Technical source review:
Review scope: the public publisher record and this procurement summary, not a clause-by-clause audit of the full standard. Use the governing publication, purchase specification and product or test documentation for acceptance.