DIN EN ISO 6157-2 2004-10 PDF

Full title and description

DIN EN ISO 6157-2:2004-10 — Fasteners — Surface discontinuities — Part 2: Nuts. This is the German (DIN) adoption of EN ISO 6157-2 which implements ISO 6157-2:1995 (criteria and limits for surface discontinuities on nuts with nominal thread diameters from 5 mm up to and including 39 mm).

Abstract

Establishes limits and acceptance criteria for various types of surface discontinuities (surface defects, laps, seams, cracks, laps, inclusions, etc.) on nuts within the nominal thread diameter range 5 mm to 39 mm. Applies across the mechanical property classes referenced in ISO 898-2 and ISO 898-6 unless product standards or purchaser requirements specify otherwise. (ISO original: 1995 edition; EN/DIN adoption published 2004).

General information

• Status: Published / Active (ISO 6157-2:1995 confirmed in periodic review; EN/DIN adoption published and in force).
• Publication date: ISO original: 1995-08 (ISO 6157-2:1995). DIN EN ISO adoption: 2004-10 (dated 1 October 2004, German version EN ISO 6157-2:2004).
• Publisher: International Organization for Standardization (ISO); national adoption published via CEN/DIN as EN ISO 6157-2:2004 (DIN).
• ICS / categories: 21.060.20 — Nuts (fasteners).
• Edition / version: ISO edition 1 (1995); German / EN adoption edition published 2004 (DIN EN ISO 6157-2:2004-10).
• Number of pages: ISO original: 10 pages; DIN/EN published (German/EN text) typically shown as 14–18 pages in vendor listings (format and annex translations can affect page count).

Scope

The standard specifies acceptance limits for surface discontinuities on nuts (threaded fasteners) with nominal thread diameters from 5 mm up to and including 39 mm. It is intended to be used where visual and specified surface-acceptance criteria are required and to be applied across the mechanical property classes defined in ISO 898-2 and ISO 898-6 unless superseded by product-specific standards or purchaser requirements. The EN/DIN adoption reproduces ISO 6157-2:1995 as the normative technical content.

Key topics and requirements

• Definitions and classification of common surface discontinuities on nuts (cracks, laps, seams, folds, inclusions, dents, scoring, etc.).
• Dimensional / size limits and acceptability criteria related to nominal thread diameter ranges (5 mm to 39 mm).
• Application to all mechanical property classes referenced in ISO 898-2 and ISO 898-6 unless otherwise specified.
• Reference to inspection methods (visual and magnified examination) and to product or purchaser specified special requirements where applicable.
• Normative references and relationship to related fastener standards (see below).

Typical use and users

Manufacturers of nuts and fasteners, quality control and inspection laboratories, purchasing/specification engineers, and conformity assessment bodies use this standard to define and enforce surface-acceptance criteria for production and incoming‑goods inspection. It is commonly used where visual or surface-quality limits must be contractually guaranteed or where harmonized acceptance criteria are required across suppliers.

Related standards

ISO 898-2 and ISO 898-6 (mechanical property classes for nuts), other parts of ISO 6157 (if applicable), EN/BS/ national versions EN ISO 6157-2:2004, and product-specific fastener standards (national adoption documents and related EN standards). Many national bodies publish identical/adopted texts (for example BS EN ISO 6157-2:2004, UNE-EN ISO 6157-2, etc.).

Keywords

fasteners, nuts, surface discontinuities, surface defects, acceptance criteria, inspection, ISO 6157-2, EN ISO 6157-2, DIN, mechanical property classes, ISO 898-2, ISO 898-6.

FAQ

Q: What is this standard?

A: DIN EN ISO 6157-2:2004 is the German/EN adoption of ISO 6157-2:1995 — an international standard that sets limits and acceptance criteria for surface discontinuities on nuts (threaded fasteners) for nominal thread diameters 5–39 mm.

Q: What does it cover?

A: It covers definitions, classification and numerical acceptability limits for common surface discontinuities on nuts (e.g., cracks, laps, seams, inclusions) and indicates how those limits apply across mechanical property classes referenced in ISO 898 series unless overridden by product or purchaser requirements.

Q: Who typically uses it?

A: Nut and fastener manufacturers, quality/inspection engineers, laboratories performing visual and surface inspections, and procurement/specification specialists who need harmonized surface-acceptance criteria.

Q: Is it current or superseded?

A: The ISO original (ISO 6157-2:1995) has been periodically reviewed and was confirmed as current in ISO’s review cycle (most recently confirmed in the 2016–2021 reviews). The EN/DIN adoption was published in October 2004. Users should check national catalogues or ISO for any subsequent revisions or withdrawal notices before applying the standard.

Q: Is it part of a series?

A: Yes — it is Part 2 of ISO 6157 (the series addresses surface discontinuities for fasteners; Part numbering identifies different fastener types). It is intended to be used together with related ISO/EN fastener standards (notably ISO 898 series for mechanical property classes).

Q: What are the key keywords?

A: fasteners, nuts, surface discontinuities, acceptance criteria, inspection, ISO 6157-2, EN ISO 6157-2, DIN.