1、BSI Standards Publication BS ISO 8038:2013 Microscopes Screw threads for objectives and related nosepiecesBS ISO 8038:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 8038:2013. It supersedes BS ISO 8038:2011 which is withdrawn. The UK participation in it
2、s preparation was entrusted to Technical Committee CPW/172, Optics and Photonics. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its
3、correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013 ISBN 978 0 580 80926 2 ICS 37.020 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and
4、 Strategy Committee on 30 November 2013. Amendments issued since publication Date Text affectedBS ISO 8038:2013 ISO 2013 Microscopes Screw threads for objectives and related nosepieces Microscopes Filetages de fixation des objectifs et des porte-objectifs correspondants INTERNATIONAL STANDARD ISO 80
5、38 Third edition 2013-11-01 Reference number ISO 8038:2013(E)BS ISO 8038:2013ISO 8038:2013(E)ii ISO 2013 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by an
6、y means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 G
7、eneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 8038:2013ISO 8038:2013(E) ISO 2013 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Types of screw thread . 1 3 Basic dimensions 1 3.1 General . 1 3.2 Tolerance
8、s . 2BS ISO 8038:2013ISO 8038:2013(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
9、 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 Electrotec
10、hnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO
11、 documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held res
12、ponsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is information giv
13、en for the convenience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the followi
14、ng URL: Foreword - Supplementary information The committee responsible for this document is ISO/TC 172, Optics and photonics, Subcommittee SC 5, Microscopes and endoscopes. This third edition cancels and replaces the second edition (ISO 8038:2011), in which Table 4 has been technically revised.iv IS
15、O 2013 All rights reservedBS ISO 8038:2013INTERNATIONAL ST ANDARD ISO 8038:2013(E) Microscopes Screw threads for objectives and related nosepieces 1 Scope This International Standard specifies the dimensions of screw thread types for connecting a microscope objective to the nosepiece. The use of the
16、se screw thread types is recommended for microscopes unless other fittings are required for optical or design reasons. NOTE A specific combination of eyepiece, objective and tube lens (if provided, e.g. in an infinity-corrected optical system) is frequently used to correct aberrations. Therefore the
17、 combination of an objective from one manufacturer and the tube lens or eyepiece from another manufacturer, although conforming to this International Standard, may cause an error in magnification and/or loss of image quality. 2 Types of screw thread Types of screw thread are listed in Table 1. Table
18、 1 Types of screw thread Name of screw type Whitworth screw RMS a W26 Metric screw M25 M27 M32 aWith the exception of the length of the thread lug (see Figure 1), the values of the RMS thread conform to the internationally used screw thread defined by the Royal Microscopical Society Standard (RMS St
19、andard), in 1936. 3 Basic dimensions 3.1 General The basic dimensions of each screw thread type shall be in accordance with those given in Table 2 and illustrated in Figure 1. Table 2 Basic dimensions of the screw thread Dimensions Symbol Value Whitworth screw Metric screw RMS W26 M25 M27 M32 Angle
20、of thread 55 55 60 60 60 Pitch p 0,706 mm 0,706 mm 0,75 mm 0,75 mm 0,75 mm Height of fundamental triangle H 0,678 mm 0,678 mm 0,65 mm 0,65 mm 0,65 mm Nominal diameter D 20,320 mm 26 mm 25 mm 27 mm 32 mm ISO 2013 All rights reserved 1BS ISO 8038:2013ISO 8038:2013(E) 3.2 Tolerances Limit of sizes and
21、tolerances of each screw thread type shall be in accordance with those given in Tables 3, 4, 5, 6, 7 and illustrated in Figures 1 and 2. Table 3 Limit of size and tolerances of RMS Dimensions in millimetres Dimensions for Major diameter Pitch diameter Minor diameter Calculated play between internal
22、and external threads Allow- ances Tolerance Thread lug Internal thread max. D 20,396 D 2 19,944 D 1 19,492 Minimum play 0,046 Maximum play 0,198 +0,076 0,076 min. 20,320 19,868 19,416 0,000 External thread max. d 20,274 d 2 19,822 d 1 19,370 0,046 0,076 5,000 min. 20,198 19,746 19,294 0,122 Table 4
23、Limit of size and tolerances of W26 Dimensions in millimetres Dimensions for Major diameter Pitch diameter Minor diameter Calculated play between internal and external threads Allow- ances Tolerance Thread lug Internal thread max. D D 2 25,660 D 1 25,300 Minimum play 0,060 Maximum play 0,220 +0,204
24、0,100 min. 26,000 25,580 25,200 +0,104 External thread max. d 25,930 d 2 25,520 d 1 25,070 0,070 0,100 5,000 min. 25,830 25,440 24,940 0,170 Table 5 Limit of size and tolerances of M25 Dimensions in millimetres Dimensions for Major diameter Pitch diameter Minor diameter Calculated play between inter
25、nal and external threads Allow- ances Tolerance Thread lug Internal thread max. D D 2 24,659 D 1 24,378 Minimum play 0,022 Maximum play 0,279 +0,190 0,190 min. 24,513 24,188 0,000 External thread max. d 24,978 d 2 24,491 d 1 0,022 0,140 5,000 min. 24,838 24,380 0,162 Table 6 Limit of size and tolera
26、nces of M27 Dimensions in millimetres Dimensions for Major diameter Pitch diameter Minor diameter Calculated play between internal and external threads Allow- ances Tolerance Thread lug Internal thread max. D D 2 26,660 D 1 26,378 Minimum play 0,022 Maximum play 0,281 +0,190 0,190 min. 26,513 26,188
27、 0,000 External thread max. d 26,978 d 2 26,491 d 1 0,022 0,140 4,500 min. 26,838 26,379 0,162 2 ISO 2013 All rights reservedBS ISO 8038:2013ISO 8038:2013(E) Table 7 Limit of size and tolerances of M32 Dimensions in millimetres Dimensions for Major diameter Pitch diameter Minor diameter Calculated p
28、lay between internal and external threads Allow- ances Tolerance Thread lug Internal thread max. D D 2 31,663 D 1 31,378 Minimum play 0,022 Maximum play 0,286 +0,190 0,190 min. 31,513 31,188 0,000 External thread max. d 31,978 d 2 31,491 d 1 0,022 0,140 5,000 min. 31,838 31,377 0,162 ISO 2013 All ri
29、ghts reserved 3BS ISO 8038:2013ISO 8038:2013(E) Dimensions in millimetres a) b) Key 1 tube, objective changer, etc 2 thread lug 3 objective 4 internal thread 5 external thread Figure 1 Definitions and basic dimensions of Whitworth screw threads, RMS and W264 ISO 2013 All rights reservedBS ISO 8038:2
30、013ISO 8038:2013(E) Dimensions in millimetres a) b) Key 1 tube, objective changer, etc 2 thread lug 3 objective 4 internal thread 5 external thread Figure 2 Definitions and basic dimensions of Metric screw threads, M25, M27 and M32 ISO 2013 All rights reserved 5BS ISO 8038:2013ISO 8038:2013(E) ISO 2
31、013 All rights reserved ICS 37.020 Price based on 5 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services. BSI is incorporated by Royal Charter. British Standards and other standar
32、dization products are published by BSI Standards Limited. British Standards Institution (BSI) BSI Group Headquarters 389 Chiswick High Road London W4 4AL UK About us We bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise in
33、to standards -based solutions. The knowledge embodied in our standards has been carefully assembled in a dependable format and refined through our open consultation process. Organizations of all sizes and across all sectors choose standards to help them achieve their goals. Information on standards
34、We can provide you with the knowledge that your organization needs to succeed. Find out more about British Standards by visiting our website at or contacting our Customer Services team or Knowledge Centre. Buying standards You can buy and download PDF versions of BSI publications, including British
35、 and adopted European and international standards, through our website at where hard copies can also be purchased. If you need international and foreign standards from other Standards Development Organizations, hard copies can be ordered from our Customer Services team. Subscriptions Our range of s
36、ubscription services are designed to make using standards easier for you. For further information on our subscription products go to With British Standards Online (BSOL) youll have instant access to over 55,000 British and adopted European and international standards from your desktop. Its availabl
37、e 24/7 and is refreshed daily so youll always be up to date. You can keep in touch with standards developments and receive substantial discounts on the purchase price of standards, both in single copy and subscription format, by becoming a BSI Subscribing Member. PLUS is an updating service exclusiv
38、e to BSI Subscribing Members. You will automatically receive the latest hard copy of your standards when theyre revised or replaced. To find out more about becoming a BSI Subscribing Member and the benefits of membership, please visit With a Multi-User Network Licence (MUNL) you are able to host st
39、andards publications on your intranet. Licences can cover as few or as many users as you wish. With updates supplied as soon as theyre available, you can be sure your documentation is current. For further information, email . Revisions Our British Standards and other publications are updated by amen
40、dment or revision. We continually improve the quality of our products and services to benefit your business. If you find an inaccuracy or ambiguity within a British Standard or other BSI publication please inform the Knowledge Centre. Copyright All the data, software and documentation set out in all
41、 British Standards and other BSI publications are the property of and copyrighted by BSI, or some person or entity that owns copyright in the information used (such as the international standardization bodies) and has formally licensed such information to BSI for commercial publication and use. Exce
42、pt as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. Details and advice can be obtained from
43、the Copyright & Licensing Department. Useful Contacts: Customer Services Tel: +44 845 086 9001 Email (orders): Email (enquiries): Subscriptions Tel: +44 845 086 9001 Email: Knowledge Centre Tel: +44 20 8996 7004 Email: Copyright & Licensing Tel: +44 20 8996 7070 Email: NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
