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SIST ISO 9177-2:1995
01-junij-1995
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Mechanical pencils -- Part 2: Black leads -- Classification and dimensions
Porte-mine -- Partie 2: Mines graphite -- Classification et dimensions
Ta slovenski standard je istoveten z: ISO 9177-2:1989
ICS:
01.100.40 Risalna oprema Drawing equipment
SIST ISO 9177-2:1995 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ISO 9177-2:1995
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SIST ISO 9177-2:1995
INTERNATIONAL
IS0
STANDARD
9177-2
First edition
1989-03-15
Mechanical pencils -
Part 2 :
Black leads - Classification and dimensions
Porte-mine -
Partie 2: Mines graphite - Classification et dimensions
Reference number
IS0 9177-2 : 1989 (E)
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SIST ISO 9177-2:1995
ISO 9177-2 : 1989 (El
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work. IS0
collaborates closely with the International Electrotechnical Commission (IEC) on all
matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISOCouncil. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
International Standard IS0 9177-2 was prepared by Technical Committee ISO/TC 10,
Technical drawings.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless otherwise stated.
0 IS0 1989
All rights reserved. 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 Orga nization for Standardization
Case postale CH-121 1 Geneve 20 l Switzerland
56 l
Printed in Switzerland
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SIST ISO 9177-2:1995
IS0 9177-2: 1989 (E)
INTERNATIONAL STANDARD
Mechanical pencils -
Part 2 I
Classification and dimensions
Black leads -
Table 1 - Classification according to hardness degree
1 Scope and field of application
Nominal diameter
This part of IS0 9177 specifies a classification and dimensions
Hardness degree (see 3.2)
mm
for black leads used for mechanical pencils. I
I
0,35
Two types of black leads are available :
0,5 6H, 5H, 4H, 3H, 2H, H, F, HB,
0,7 B, 2B
-
polymer leads (designated by the letter “P”)
1
-
ceramic leads (designated by the letter “C”)
9H, 8H, 7H, 6H, 5H, 4H, 3H, 2H,
2
H, F, HB, B, 2B, 3B, 4B, 5B, 6B
I
I
2 References
IS0 128, Technical
...