DIN 11853-2 2025-04 PDF

Full title and description

STB DIN 11853-2 2025-04 — Stainless steel components for hygienic applications in the food industry — Part 2: Hygienic flanged pipe connection (short type). This document specifies dimensions, design, materials and surface requirements for hygienic flange connections with O‑ring intended for butt welding to pipes used in food, beverage and related hygienic processes.

Abstract

This edition is a 2025 revision of the DIN 11853 series focused on flange (flanged) hygienic connections: it updates tolerances, materials and hygienic surface classes, adds ordering/designation information and aligns the part with current pipe series (DIN 11866 / EN 10357) used in the food and chemical industries. The revised set of DIN 11853 parts was issued as part of a coordinated update in 2025.

General information

• Status: Active (2025 revision available; earlier 2011 edition shown as withdrawn by some distributors while a 2025 edition is published).
• Publication date: 2025 — listed by some document distributors as April 2025 (catalog entry: "2025-04") and by standards aggregators as 01 September 2025 (2025-09). Users should check the purchaser copy for the exact official DIN publication date.
• Publisher: Deutsches Institut für Normung (DIN).
• ICS / categories: 23.040.60 (Flanges, couplings and joints) — hygienic stainless‑steel components for food/chemical industry.
• Edition / version: 2025 edition (as referenced by suppliers under the code "2025-04"; also listed as 2025-09 in some catalogs).
• Number of pages: ~36 pages for the 2025 release as listed by standards resellers (earlier 2011 edition was ~21 pages). Confirm page count with the copy you order.

Scope

This part of DIN 11853 specifies dimensions, design, O‑ring sealing details and material/surface requirements for hygienic flanged pipe connections in short execution, intended for butt welding to pipes dimensioned according to DIN 11866 / EN 10357 (series A/C etc.). It sets permissible pressure/temperature ratings for typical DN ranges, hygienic surface finish classes and requirements for burr‑free edges and tolerances relevant to food, beverage, dairy and related hygienic processing.

Key topics and requirements

• Dimensional specifications for hygienic flange connections (short type) and mating interfaces to DIN 11866 / EN 10357.
• Material grades and forging/manufacture notes for stainless steels commonly used in hygienic equipment (references to EN/DIN steel grades).
• Hygienic surface finish classes (H1…H5 / corresponding HE classes) including Ra roughness measurement requirements and electropolishing notes.
• O‑ring sealing design and recommended sealing materials (temperature and chemical compatibility guidance).
• Permissible working pressures by pipe outer‑diameter ranges (examples: 2.5 MPa / 25 bar for smaller OD ranges, 1.6 MPa / 16 bar mid sizes, 1.0 MPa / 10 bar for larger sizes) and applicable temperature ranges when suitable seal materials are used.
• Ordering data, designation rules, symbols and a clarified "symbols and abbreviations" section added in the 2025 revision.

Typical use and users

Primary users are designers, fabricators and QA personnel in the food, beverage, dairy, pharmaceutical and fine‑chemical industries; OEMs of hygienic process equipment; stainless‑steel component manufacturers; and procurement/specification engineers who require standardized hygienic flanged connections for pipe systems. Plant maintenance and validation teams also use the standard to verify compatibility, cleanability and traceability of connection components.

Related standards

Commonly referenced standards and related documents: DIN 11853‑1 (screw couplings), DIN 11853‑3 (clamp connections), DIN 11866 / EN 10357 (tube/tube series dimensions), DIN EN ISO 4288 (surface roughness measurement), DIN 11850 / DIN 11864 and industry documents such as ASME BPE where cross‑compatibility is required. The 2025 update to the DIN 11853 series was coordinated across parts 1–3.

Keywords

DIN 11853‑2, hygienic flange, flange connection, stainless steel fittings, food industry, O‑ring, hygienic surface finish, EN 10357, DIN 11866, sanitary flange, sanitary fittings.

FAQ

Q: What is this standard?

A: DIN 11853‑2 (2025 edition as referenced here) is the DIN standard that defines hygienic flanged pipe connections (short type) made of stainless steel for food and related industries, covering dimensions, materials, sealing and surface requirements.

Q: What does it cover?

A: It covers the geometry and interface dimensions of the flange connection, permitted materials and surface finishes, O‑ring sealing design and selection guidance, pressure ratings by pipe OD, tolerances and ordering/designation conventions used when specifying or manufacturing hygienic flange components.

Q: Who typically uses it?

A: Engineers, fabricators, QA/validation teams, procurement/specification authors and OEMs in the food, beverage, dairy, pharmaceutical and related hygienic process industries — basically anyone who designs, buys or manufactures hygienic stainless‑steel pipe connections.

Q: Is it current or superseded?

A: The 2011 edition of DIN 11853‑2 is shown as withdrawn in some catalogs; a 2025 revision of DIN 11853‑2 has been published (catalog listings show 2025‑04 and 2025‑09 entries). Users should obtain the official 2025 DIN copy to confirm status, exact publication date and the definitive text.

Q: Is it part of a series?

A: Yes — DIN 11853 is a multi‑part series addressing hygienic stainless‑steel components: Part 1 (pipe connections), Part 2 (flange connections) and Part 3 (clamp connections). The series was revised together in 2025.

Q: What are the key keywords?

A: Hygienic flange, stainless steel fittings, O‑ring, sanitary connection, DIN 11853, EN 10357, surface finish, Ra, electropolish, food industry fittings.