EN 1661:1997
(Main)Hexagon nuts with flange (ISO/DIS 4161:1996, modified)
Hexagon nuts with flange (ISO/DIS 4161:1996, modified)
This European Standard gives specifications for hexagon nuts with flange, with threads from M5 to M20 inclusive, of product grade A threads up to and includingM16 and product grade B threads above M16 and property classes 8, 10, 12 and A2-70.
Sechskantmuttern mit Flansch (ISO/DIS 4161:1996, modifiziert)
Diese Europäische Norm enthält Festlegungen für Sechskantmuttern mit Flansch,mit Gewinde von M5 bis M20, in Produktklasse A für Gewinde bis M16 und Produktklasse B für Gewinde über M16 und Festigkeitsklassen 8, 10, 12 und A2- 70.
Ecrous hexagonaux à embase cylindro-tronconique (ISO/DIS 4161:1996, modifiée)
La présente Norme européenne définit les caractéristiques des écrous hexagonaux à embase cylindro-tronconique, de filetage M5 à M20 inclus de grade A pour filetage M16 et classes de qualité 8, 10,12 et A2-70.
Šestrobe matice s poševnim krajcem (ISO/DIS 4161:1996, dopolnjen)
General Information
- Status
- Published
- Publication Date
- 16-Dec-1997
- Technical Committee
- CEN/TC 185 - Threaded and nonthreaded mechanical fasteners and accessories
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 13-Apr-2023
- Completion Date
- 06-Dec-2025
Relations
- Effective Date
- 22-Dec-2008
Overview
EN 1661:1997 is the CEN European Standard that defines specifications for hexagon nuts with flange (based on ISO/DIS 4161:1996, modified). The standard covers nuts with threads from M5 to M20 inclusive, addressing different product grades and property classes to support consistent manufacturing, selection and use across industries.
Key elements in the scope include:
- Threads: M5–M20 (inclusive)
- Product grades: Grade A threads up to and including M16; Grade B threads above M16
- Property classes: 8, 10, 12 and A2-70
- Organization: published under the authority of CEN and aligned with ISO/DIS 4161:1996 (modified)
This standard supports consistent fastener selection and interchangeability, reducing risk in bolted assemblies and simplifying procurement across suppliers.
Key Topics
- Dimensions and thread range: Defines the applicable thread sizes (M5–M20) and product grade breakpoints.
- Product grade distinction: Clarifies which product grade applies depending on thread size (A up to M16; B above M16).
- Property classes covered: Includes common strength classes (8, 10, 12) and the A2-70 designation for stainless variants.
- Conformance and compatibility: Establishes a harmonized specification to ensure nuts from different manufacturers are compatible in assemblies.
Applications
EN 1661:1997 is directly relevant for procurement specialists, designers and manufacturers dealing with bolted joints in:
- Machinery and equipment - standardized nuts for reliable assembly and maintenance
- Automotive and transport - parts that require consistent mechanical behaviour
- Construction and structural fastening - where interchangeability and load capacity are important
- General industrial manufacturing - stock management and quality control for fasteners
Practical benefits include simplified sourcing, improved interchangeability of parts, and clearer specification of mechanical and material options when selecting hexagon nuts with flange.
Related Standards
- ISO/DIS 4161:1996 (modified) - the basis for EN 1661:1997
- Other EN and ISO fastener standards that address mechanical properties, dimensions and materials for bolts, nuts and screws
For engineers and procurement teams, EN 1661:1997 provides a concise specification framework to select the correct hexagon nut with flange for thread sizes M5–M20 and to ensure compatibility with common property classes and product grades.
Frequently Asked Questions
EN 1661:1997 is a standard published by the European Committee for Standardization (CEN). Its full title is "Hexagon nuts with flange (ISO/DIS 4161:1996, modified)". This standard covers: This European Standard gives specifications for hexagon nuts with flange, with threads from M5 to M20 inclusive, of product grade A threads up to and includingM16 and product grade B threads above M16 and property classes 8, 10, 12 and A2-70.
This European Standard gives specifications for hexagon nuts with flange, with threads from M5 to M20 inclusive, of product grade A threads up to and includingM16 and product grade B threads above M16 and property classes 8, 10, 12 and A2-70.
EN 1661:1997 is classified under the following ICS (International Classification for Standards) categories: 21.060.20 - Nuts. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 1661:1997 has the following relationships with other standards: It is inter standard links to EN 1661:1997/AC:1998. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Šestrobe matice s poševnim krajcem (ISO/DIS 4161:1996, dopolnjen)Sechskantmuttern mit Flansch (ISO/DIS 4161:1996, modifiziert)Ecrous hexagonaux a embase cylindro-tronconique (ISO/DIS 4161:1996, modifiée)Hexagon nuts with flange
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