Heat-treated steel tapping screws - Mechanical properties
(ISO 2702:1992)
The European Standard EN ISO 2702:1994 has the status of a Swedish Standard. EN ISO 2702:1994 en- dorses ISO 2702:1992. This document contains the official English version of EN ISO 2702:1994 with a Swedish translation.
This standard supersedes the Swedish Standards SS 3180 and SS 3181.
Swedish Standards corresponding to documents re- ferred to in this Standard are listed in ”Catalogue of Swedish Standards”, annually issued by SIS. The Catalogue lists, with reference number and year of Swedish approval, International and European Standards approved as Swedish Standards as well as other Swedish Standards.
Fästelement - Sätthärdade gäng- pressande skruvar av stål - Hållfas- thetsfordringar (ISO 2702:1992)
Europastandarden EN ISO 2702:1994 gäller som svensk standard. EN ISO 2702:1994 ikraftsätter ISO 2702:1992. Detta dokument innehåller den offi- ciella engelska versionen av EN ISO 2702:1994 med svensk översättning.
Standarden ersätter SS 3180 och SS 3181.
Motsvarigheten och aktualiteten i svensk standard till de publikationer som omnämns i denna standard framgår av ”Katalog över svensk standard”, som år- ligen ges ut av SIS. I katalogen redovisas interna- tionell och europeiska standarder som fastställts som svenska standarder och övriga gällande svenska standarder.
UDC 621.882.21
Descriptors: fasteners, screws, sheet metal screws, specifications, mechanical propeties, tests
English version
Heat-treated steel tapping screws - Mechanical properties (ISO 2702:1992)
Vis à tôle en acier traité thermiquement - Carac- Wärmebehandelte Blechschrauben aus Stahl - téristiques mécaniques (ISO 2702:1992) Mechanische Eigenschaften (ISO 2702:1992)
This European Standard was approved by CEN on 1994-07-26. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member.
The European Standards exist in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Nether- lands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
CEN
European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung
Central Secretariat: rue de Stassart 36, B -1050 BRUSSELS
UDK 621.882.21
Nyckelord: fästelement, skruvar, plåtskruv, krav, hållfasthetsfordringar, provning
Svensk version
Fästelement - Sätthärdade gängpressande skruvar av stål - Hållfasthetsfordringar (ISO 2702:1992)
Vis à tôle en acier traité thermique- Heat-treated steel tapping screws - Wärmebehandelte Blechscrauben ment – Caractéristiques Mechanical properties aus Stahl - Mechanische Eigen- mécaniques (ISO 2702:1992) (ISO 2702:1992) schaften (ISO 2702:1992)
Denna europastandard antogs av CEN 1994-07-26. CEN-medlemmarna är förplik- tade att följa fordringarna i CEN/CENELECs interna bestämmelser som anger på vilka villkor denna europastandard i oförändrat skick skall utges som nationell standard.
Aktuella förteckningar och bibliografiska referenser rörande sådana nationella standarder kan på begäran erhållas från CENs Centralsekretariat eller från någon av CENs medlemmar.
Denna europastandard finns i tre officiella versioner engelsk, fransk och tysk. En version på ett annat språk, översatt under ansvar av en CEN-medlem till det egna språket och anmäld till CENs Centralsekretariat har samma status som de officiella versionerna.
CENs medlemmar är de nationella standardiseringsorganen i Belgien, Danmark, Finland, Frankrike, Grekland, Irland, Island, Italien, Luxemburg, Nederländerna, Norge, Portugal, Schweiz, Spanien, Storbritannien, Sverige, Tyskland, och Österrike.
CEN
European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung
Central Secretariat: rue-de Stassart 36, B-1050 BRUSSELS
Foreword
This European Standard has been taken over by the Technical Committee CEN/TC 185 ”Threaded and non-threaded mechanical fasteners and accessories”
from the work of ISO/TC 2 ”Fasteners” of the International Organization for Standardization (ISO).
This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 1995, and conflicting national standards shall be withdrawn at the latest by January 1995.
According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Fin- land, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom.
Endorsement notice
The text of the International Standard ISO 2702:1992 was approved by CEN as a European Standard without any modification.
NOTE: Normative references to international publications are listed in annex ZA (normative)
Förord
Innehållet i denna europastandard har utarbetats av ISO/TC 2 ”Fasteners” inom den internationella standardiseringsorganisationen (ISO) och överförts till euro- pastandard av den tekniska kommittén CEN/TC 185 ”Threaded and non-threaded mechanical fasteners and accessories”.
Denna europastandard skall ges status som nationell standard, antingen genom publicering av en identisk text eller genom ikraftsättning, senast i januari 1995.
Motstridande nationella standarder skall upphävas senast i januari 1995.
Enligt CEN/CENELECS interna bestämmelser är följande länder förpliktade att införa denna europastandard: Belgien, Danmark, Finland, Frankrike, Grekland, Irland, Island, Italien, Luxemburg, Nederländerna, Norge, Portugal, Schweiz, Spanien, Storbrittanien, Sverige, Tyskland, Österrike.
Meddelande om ikraftsättning
Texten i den internationella standarden ISO 2702:1994 antogs utan ändring av CEN som europastandard.
ANM – De europeiska referenserna till internationella dokument ges i bilaga ZA (bindande).
I n t r o d u c t i o n
The primary objective of this International Standard is to ensure that tapping screws will form mating threads in materials into which they are normally driven without deforming their own thread and without break- ing during assembly or service.
Orientering
Den främsta avsikten med denna internationella standard är att säkerställa att gängpressande skruvar kommer att forma motgående gängor i material i vilka de normalt skruvas, utan deformation av skruvens egen gänga och utan att brott uppstår under montering eller då skruven fullgör sin funktion.
Heat-treated steel tapping screws
1 S c o p e
This International Standard specifies the character- istics of heat-treated steel tapping screws, with tapping screw thread from ST2,2 to ST8 inclusive in accordance with ISO 1478, together with the corre- sponding test methods.
Table 1 - Case depth
2 N o r m a t i v e r e f e r e n c e s
The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All stan- dards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 1478; 1983, Tapping screws thread.
ISO 6507-1:1982, Metallic materials — Hardness test – Vickers test – Part 1: HV 5 to HV 100.
ISO 6507-2:1983, Metallic materials – Hardness test – Vickers test – Part 2: HV 0,2 to less than HV 5.
3 M a t e r i a l s
Tapping screws shall be made from cold heading, case hardening quality steel.
4
4.1
Requirements
Metallurgical requirements
4.1.1 Surface hardness
The minimum surface hardness after heat treatment shall be 450 HV 0,3 (see ISO 6507-2).
– Mechanical properties
4.1.2 Case depth
The case depth shall conform to the values given in table 1.
4.1.3 Core hardness The core hardness after
270 HV 5 to 390 HV 5
heat treatment shall be for threads
270 HV 10 to 390 HV 10 for threads 4.1.4 Microstructure
The microstructure shall show no band of free ferrite between the case and core.
4.2 Mechanical requirements 4.2.1 Thread-forming capability
Tapping screws shall form a mating thread without deforming their own thread when driven into a test plate, in accordance with 6.2.1.
4.2.2 Torsional strength
Tapping screws shall have a torsional strength such that the torque necessary to cause failure, when tested in accordance with 6.2.2, shall equal or ex- ceed the minimum torque values given in table 3 for the applicable screw threads.
