Under publication
ISO 3669
Vacuum technology — Dimensions of knife-edge flanges
Reference number
ISO 3669
Edition 4
2026-06
© ISO 2026
Under publication
Under publication (Edition 4, 2026)
Final production steps (up to seven weeks).
Will replace ISO 3669:2020

Abstract

This document specifies the dimensions of fixed or rotatable bolted knife-edge flanges used in vacuum systems for pressures ranging from atmospheric to as low as 10−11 Pa.

General information

  • Status
     : Under development
    Publication date
     : 2026-06
    Stage
    : International Standard under publication [60.00]
  • Edition
     : 4
  • Technical Committee :
    ISO/TC 112
    ICS :
    23.160 
  • RSS updates

Life cycle

Sustainable Development Goals

This standard contributes to the following Sustainable Development Goal

9
Industry, Innovation and Infrastructure

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