1、BSI Standards PublicationBS ISO 8038:2013Microscopes Screw threadsfor objectives and relatednosepiecesBS ISO 8038:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 8038:2013. Itsupersedes BS ISO 8038:2011 which is withdrawn.The UK participation in its prepar
2、ation was entrusted to TechnicalCommittee CPW/172, Optics and Photonics.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplic
3、ation. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 80926 2ICS 37.020Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee o
4、n 30 November 2013.Amendments issued since publicationDate Text affectedBS ISO 8038:2013 ISO 2013Microscopes Screw threads for objectives and related nosepiecesMicroscopes Filetages de fixation des objectifs et des porte-objectifs correspondantsINTERNATIONAL STANDARDISO8038Third edition2013-11-01Ref
5、erence numberISO 8038:2013(E)BS ISO 8038:2013ISO 8038:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical,
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7、41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 8038:2013ISO 8038:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Types of screw thread . 13 Basic dimensions 13.1 General . 13.2 Tolerances . 2BS ISO 8038:2013ISO 8038:2013(E)ForewordISO
8、 (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 com
9、mittee 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 electrot
10、echnical 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 documents should be noted. This document was draft
11、ed 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 responsible for identifying any or all such patent righ
12、ts. 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 given for the convenience of users and does not constitu
13、te 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 following URL: Foreword - Supplementary informationThe commit
14、tee 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 ISO 2013 All rights reservedBS ISO 8038:2013INTERNATIONAL
15、STANDARD ISO 8038:2013(E)Microscopes Screw threads for objectives and related nosepieces1 ScopeThis International Standard specifies the dimensions of screw thread types for connecting a microscope objective to the nosepiece.The use of these screw thread types is recommended for microscopes unless o
16、ther 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 combination of an objective from one manufacturer and the tub
17、e 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 threadTypes of screw thread are listed in Table 1.Table 1 Types of screw threadName of screw typeWhitworth screw RMSaW26
18、 Metric screw M25 M27 M32aWith 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 Standard), in 1936.3 Basic dimensions3.1 GeneralThe basic dimensions of
19、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 threadDimensions SymbolValueWhitworth screw Metric screwRMS W26 M25 M27 M32Angle of thread 55 55 60 60 60Pitch p 0,706 mm 0,706 mm 0,75 mm 0,75 mm 0,75 mmHeight
20、 of fundamental triangleH 0,678 mm 0,678 mm 0,65 mm 0,65 mm 0,65 mmNominal 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 TolerancesLimit of sizes and tolerances of each screw thread type shall be in accordance with those given in Table
21、s 3, 4, 5, 6, 7 and illustrated in Figures 1 and 2.Table 3 Limit of size and tolerances of RMSDimensions in millimetresDimensions forMajor diameterPitch diameterMinor diameterCalculated play between internal and external threadsAllow-ancesToleranceThread lugInternal threadmax.D20,396D219,944D119,492
22、Minimum play0,046Maximum play0,198+0,0760,076min. 20,320 19,868 19,416 0,000 External threadmax.d20,274d219,822d119,370 0,0460,0765,000min. 20,198 19,746 19,294 0,122 Table 4 Limit of size and tolerances of W26Dimensions in millimetresDimensions forMajor diameterPitch diameterMinor diameterCalculate
23、d play between internal and external threadsAllow-ancesToleranceThread lugInternal threadmax.DD225,660D125,300Minimum play0,060Maximum play0,220+0,2040,100min. 26,000 25,580 25,200 +0,104 External threadmax.d25,930d225,520d125,070 0,0700,1005,000min. 25,830 25,440 24,940 0,170 Table 5 Limit of size
24、and tolerances of M25Dimensions in millimetresDimensions forMajor diameterPitch diameterMinor diameterCalculated play between internal and external threadsAllow-ancesToleranceThread lugInternal threadmax.DD224,659D124,378Minimum play0,022Maximum play0,279+0,1900,190min. 24,513 24,188 0,000 External
25、threadmax.d24,978d224,491d1 0,0220,1405,000min. 24,838 24,380 0,162 Table 6 Limit of size and tolerances of M27Dimensions in millimetresDimensions forMajor diameterPitch diameterMinor diameterCalculated play between internal and external threadsAllow-ancesToleranceThread lugInternal threadmax.DD226,
26、660D126,378Minimum play0,022Maximum play0,281+0,1900,190min. 26,513 26,188 0,000 External threadmax.d26,978d226,491d1 0,0220,1404,500min. 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 M32Dimensions in millimetresDimensions f
27、orMajor diameterPitch diameterMinor diameterCalculated play between internal and external threadsAllow-ancesToleranceThread lugInternal threadmax.DD231,663D131,378Minimum play0,022Maximum play0,286+0,1900,190min. 31,513 31,188 0,000 External threadmax.d31,978d231,491d1 0,0220,1405,000min. 31,838 31,
28、377 0,162 ISO 2013 All rights reserved 3BS ISO 8038:2013ISO 8038:2013(E)Dimensions in millimetresa) b) Key1 tube, objective changer, etc2 thread lug3 objective4 internal thread5 external threadFigure 1 Definitions and basic dimensions of Whitworth screw threads, RMS and W264 ISO 2013 All rights rese
29、rvedBS ISO 8038:2013ISO 8038:2013(E)Dimensions in millimetresa) b) Key1 tube, objective changer, etc2 thread lug3 objective4 internal thread5 external threadFigure 2 Definitions and basic dimensions of Metric screw threads, M25, M27 and M32 ISO 2013 All rights reserved 5BS ISO 8038:2013ISO 8038:2013
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