EN ISO 10666:1999

SLOVENSKI STANDARD
01-julij-2001
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Drilling screws with tapping screw thread - Mechanical and functional properties (ISO
10666:1999)
Bohrschrauben mit Blechschraubengewinde - Mechanische und funktionnelle
Eigenschaften (ISO 10666:1999)
Vis autoperceuses avec filetage de vis a tôle - Caractéristiques mécaniques et
fonctionnelles (ISO 10666:1999)
Ta slovenski standard je istoveten z: EN ISO 10666:1999
ICS:
21.060.10 Sorniki, vijaki, stebelni vijaki Bolts, screws, studs
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 10666
First edition
1999-09-01
Drilling screws with tapping screw thread —
Mechanical and functional properties
Vis autoperceuses avec filetage de vis à tôle — Caractéristiques mécaniques
et fonctionnelles
A
Reference number
ISO 10666:1999(E)
ISO 10666:1999(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 10666 was prepared by Technical Committee ISO/TC 2, Fasteners.
©  ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
INTERNATIONAL STANDARD  © ISO ISO 10666:1999(E)
Drilling screws with tapping screw thread — Mechanical
and functional properties
1 Scope
This International Standard specifies the properties of heat treated screws with a tapping screw thread in
accordance with ISO 1478, and which are designed with a drilling point which automatically drills the core hole for
the screw during assembly. Such screws then automatically form the mating screw thread, either in a non-cutting or
in a cutting operation, with the aid of the threaded portion of the screw adjoining the drilling point.
The purpose of this International Standard is to ensure that the screws are able to drill their core hole and form their
mating screw thread without becoming distorted or fracturing in the process, provided that no overstressing has
occurred. Consequently the following characteristics are regarded as representing the most important aspects for
the assessment of the mechanical and operational characteristics of a drilling screw:
 surface hardness;
 capability of core hole drilling and forming of the mating female screw thread;
 torsional strength.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 1478:1999, Tapping screw thread.
ISO 4042:1999, Fasteners — Electroplated coatings.
ISO 6507-1:1997, Metallic materials — Vickers hardness test — Part 1: Test method.
ISO 15330:1999, Fasteners — Preloading test for the detection of hydrogen embrittlement — Parallel bearing
surface method.
© ISO
ISO 10666:1999(E)
3 Requirements
3.1 Material
Case hardening steel or heat treatable steel shall be used as the material for drilling screws.
3.2 Metallurgical properties
3.2.1 Surface hardness
The minimum surface hardness of drilling screws after heat treatment shall be 530 HV 0,3.
3.2.2 Core hardness
The core hardness after heat treatment shall be
 320 HV 5 to 400 HV 5 for threads < ST 4,2 and
 320 HV 10 to 400 HV 10 for threads . ST 4,2
including a recommended minimum tempering temperature of 330 °C.
The tempering temperature range 275 °C to 315 °C shall be avoided in order to minimize the risk of tempered
martensite embrittlement.
3.2.3 Case depth
The case depth shall conform to the values given in Table 1.
Table 1 — Case depth
Thread Case depth
mm
min. max.
ST 2,9 and ST 3,5 0,05 0,18
ST 4,2 to ST 5,5 0,10 0,23
ST 6,3 0,15 0,28
3.2.4 Microstructure
The microstructure of drilling screws shall not exhibit any ferrite streaks between the surface zone and the core after
heat treatment.
3.2.5 Hydrogen embrittlement
For electroplated drilling screws there is a risk of failure due to hydrogen embrittlement. Therefore steps shall be
taken by the manufacturer and/or the electroplater to manage the risk including test detection in accordance with
ISO 15330.
In this connection ISO
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