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ISO/PRF 3669

Vacuum technology — Dimensions of knife-edge flanges

General information

Current stage: 50.00 Effective date: 9 mar 2026

Originator: ISO

Owner: ISO/TC 112

Type: International Standard

ICS: 23.160

Scope

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.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 3669:2020

NOW

IN_DEVELOPMENT
ISO/PRF 3669
50.00 Final text received or FDIS registered for formal approval
9 mar 2026