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ISO 68-2:2023

ISO general purpose screw threads — Basic and design profiles — Part 2: Inch screw threads

General information

Valid from 05.10.2023
ICS Groups
21.040.20 Inch screw threads
Directives or regulations
None

Standard history

Status
Date
Type
Name
05.10.2023
Main
ISO 68-2:2023
31.01.2020
Amendment
ISO 68-2:1998/Amd 1:2020
20.12.1998
Main
ISO 68-2:1998
This document specifies the basic and design profiles for ISO inch screw threads (UN and UNR).
UN applies to both internal and external threads. UNR only applies to external threads. A flat or rounded root contour, due to the threading process, is specified for UN threads, while only a defined rounded root contour is specified for UNR external threads.
This document is applicable to the inch fastening screw threads.

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Paper
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Standard monitoring
English (PDF 932 KB)

Related products

Main

ISO 725:2009

ISO inch screw threads -- Basic dimensions
Newest version Valid from 03.04.2009
Main

ISO 5864:1993

ISO inch screw threads -- Allowances and tolerances
Newest version Valid from 23.12.1993
Main

ISO 263:1973

ISO inch screw threads -- General plan and selection for screws, bolts and nuts -- Diameter range 0,06 to 6 in
Newest version Valid from 01.04.1973
Amendment

ISO 68-2:1998/Amd 1:2020

The dimensions of basic profile
Withdrawn from 05.10.2023

Standards designation

EVS Estonian standard
EN European standard (published by an CEN or CENELEC)
EN ISO International standard adopted as an European standard
ISO International Organization for Standardization’s standard
IEC International Electrotechnical Commission’s standard
HD CENELEC’s harmonisation document
   
EVS-EN European standard implemented in Estonia
EVS-EN ISO International standard adopted in Europe and implemented in Estonia
EVS-EN ISO/IEC International standard/International electrotechnical standard adopted in Europe and implemented in Estonia
EVS-IEC International electrotechnical standard implemented in Estonia
EVS-ISO International standard implemented in Estonia
   
A, AMD amedment
+A a full standard plus the amendment
/A only amendment
COR, AC corrigendum
+COR a full standard plus the corrigendum
NA national annex
+NA a full standard plus the national annex
/NA only national annex
TS technical specification
TR technical report
CWA agreement, developed by a CEN or CENELEC
prEVS-EN (etc) draft standard
   
et the standard is in Estonian only
en the standard is in English only
et-en the standard is in Parallel text Estonian-English