1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 21.040.10 ISBN 0-626-15613-0 SANS 1700-2-9:1996 Edition 1 and nat. amdt 1 ISO 1502:1996 Edition 2 Any reference to SABS 1700-2-9 is deemed to be a re
4、ference to this standard (Government Notice No. 1373 of 8 November 2002) SOUTH AFRICAN NATIONAL STANDARD Fasteners Part 2: Screw threads Section 9: ISO general-purpose metric screw threads Gauges and gauging This national standard is the identical implementation of ISO 1502:1996 and is adopted with
5、the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof ! private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 1700-2-9:1996 Edition 1
6、and nat. amdt 1 ISO 1502:1996 Edition 2 Table of changes Change No. Date Scope Nat. amdt 1 2004 Amended to change the designation of SABS standards to SANS standards with no technical changes. Abstract Gives the necessary instructions for the manufacture and use of gauges for checking ISO general pu
7、rpose metric screw threads with a basic profile in accordance with ISO 68. Keywords bolts, external threads, fasteners, formulae (mathematics), gauges, inspection, profile measurement, screw threads, specifications, symbols, tables (data), thread gauges, threads, tolerances (measurement). National f
8、oreword This South African standard was approved by National Committee StanSA TC 5120.01, Screw threads and fasteners, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This edition is technically identical to SABS 1700-2-9:1996. INTERNATIO
9、NAL ” STANDARD Second edition 1996-02-O I IS0 general-purpose metric screw threads - Gauges and gauging Filetages m b) the purchaser should not reject any workpiece thread whose actual thread size (e.g. pitch diam- eter and virtual pitch diameter) lies inside the specified limits. In order to satisf
10、y these two principles, this Inter- national Standard establishes requisite types and sizes of gauges for checking screw threads, the con- ditions under which these gauges are to be used, and rules for the inspection of the workpiece threads. 2 Normative references The following standards contain pr
11、ovisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate t
12、he possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 1: 1975, Standard reference temperature for in- dustrial length measurements. I so 68:-J, IS0 general-purpose screw thre
13、ads - Basic profile. IS0 1938-l :-*I, Inspection of plain workpieces - Part 1: Plain limit gauges. 3 Symbols and abbreviations The symbols and abbreviations used in the text and figures in this International Standard are listed in table 1. 1) To be published. (Revision of IS0 68:1973) 2) To be publi
14、shed. IS0 1502:1996(E) Table 1 - Symbols and abbreviations Symbol or abbrevi- ation Definition 4 Width of the clearance groove at the major diameter of a gauge thread profile with com- plete flanks h2 Width of the clearance groove at the minor diameter of a gauge thread profile with com- plete flank
15、s 4 Width of the clearance groove at the major and minor diameter, respectively, of a gauge thread profile with truncated flanks d, D Basic major diameter of a workpiece thread 4 Basic minor diameter of the internal thread of a workpiece 4 D2 Basic pitch diameter of a workpiece thread es Fundamental
16、 deviation of the external thread of a workpiece (it is zero for tolerance position h) EI Fundamental deviation of the internal thread of a workpiece (it is zero for tolerance position HI Fl For thread profiles with truncated flanks, the radial distance between the pitch diameter line and the end of
17、 the straight part of the flank in the direction of the crest For thread profiles with truncated flanks, the radial distance between the pitch diameter line and the end of the straight part of the flank in the direction of the root H Height of the triangle of a thread profile 4 Tolerance on the diam
18、eter of plain plug gauges H2 Tolerance on plain ring gauges and the separ- ation of the plain faces of calliper gauges HP Tolerance on the size of check plug gauges for plain calliper gauges LML Least material limit m Distance between the middle of the tolerance zones TR of a screw ring gauge and Tc
19、p of a GO check plug MML Maximum material limit P Pitch Yl Radius of the clearance groove of the root profile of GO and NOT GO screw ring gauges or of GO and NOT GO screw calliper gauges Symbol or abbrevi- ation Definition r2 S Radius of the clearance groove of the root profile of GO and NOT GO scre
20、w plug gauges Displacement of the clearance groove from the centre of a thread profile with truncated flanks T,l2 Tolerance for each flank angle of a profile with complete flanks T,2/2 Tolerance for each flank angle of a profile with truncated flanks CP Tolerance on the pitch diameter of GO and NOT
21、GO screw check plugs, wear check plugs and setting plugs Td Tolerance for the major diameter of the external thread of a workpiece T d2 Tolerance for the pitch diameter of the external thread of a workpiece T Dl Tolerance for the minor diameter of the internal thread of a workpiece T 02 Tolerance fo
22、r the pitch diameter of the internal thread of a workpiece TP TPL Tolerance for the pitch of a gauge thread Tolerance for the pitch diameter of GO and NOT GO screw plug gauges TR Tolerance for the pitch diameter of GO and NOT GO screw ring gauges wGO Amount available for permissible wear of GO screw
23、 plug gauges and GO screw ring gauges WNG Amount available for permissible wear of NOT GO screw plug gauges and NOT GO screw ring gauges Distance between the middle of the tolerance zone H, of a GO plug gauge and the lower limit of the minor diameter of a workpiece Distance between the middle of the
24、 tolerance zone H2 of a GO calliper gauge or a GO ring gauge and the upper limit of the major diam- eter of a workpiece ZPL Distance between the middle of the tolerance zone TpL of a GO screw plug gauge and the lower limit of a workpiece thread Distance between the middle of the tolerance zone TR of
25、 a GO screw ring gauge and the upper limit of a workpiece thread IS0 1502:1996(E) 0 IS0 4 Types of gauges 4.1 Gauges for external threads of workpieces and their check plugs and setting PUF The following types are recommended: solid GO screw ring gauges; adjustable GO screw ring gauges; check plugs
26、(GO and NOT GO) for new solid GO screw ring gauges; setting plugs for adjustable GO screw ring gauges; wear check plugs for solid or adjustable GO screw ring gauges; GO screw calliper gauges; setting plugs for GO screw calliper gauges; NOT GO screw calliper gauges; setting plugs for NOT GO screw cal
27、liper gauges; solid NOT GO screw ring gauges; adjustable NOT GO screw ring gauges; check plugs (GO and NOT GO) for new solid NOT GO screw ring gauges; setting plugs for adjustable NOT GO screw ring gauges; wear check plugs for solid or adjustable NOT GO screw ring gauges; plain GO ring gauges; plain
28、 GO calliper gauges; plain NOT GO calliper gauges; plain NOT GO ring gauges; check plugs for new plain GO calliper gauges; check plugs for new plain NOT GO calliper gauges; wear check blugs for plain GO calliper gauges. 4.2 Gauges for internal threads of workpieces The following types are recommende
29、d: - GO screw plug gauges; - NOT GO screw plug gauges; - plain GO plug gauges; - plain NOT GO plug gauges. 5 Gauging of workpieces It is not necessary to use all the gauges mentioned in clause 4. However, in gauging the limits (checking that the tolerances have been respected), it is essen- tial tha
30、t a GO and NOT GO gauging always be carried out with one of the GO screw gauges and one of the NOT GO screw gauges referred to in 4.1 and 4.2. 5.1 Gauging of external threads Preferably a solid or adjustable GO screw ring gauge should be used for gauging an external thread. To save time, for conveni
31、ence in checking, or in cases where a GO screw ring gauge is not applicable, a GO screw calliper gauge may be used. It is, however, recommended that gauging with GO screw calliper gauges should be supplemented by random sampling with a GO screw ring gauge, so that when a large number of parts are ch
32、ecked with a GO screw calliper gauge, a certain percentage receives an additional check with a GO screw ring gauge, thus giving greater assurance of interchangeability be- tween the workpiece threads. A GO screw calliper gauge should not be used if the manufacturing process is likely to cause deviat
33、ions in the workpiece thread, which this gauge is not certain to detect, for example local pitch errors in milled threads or burrs at the start of the thread. Further- more, a GO screw calliper gauge is not suitable for checking non-rigid parts, for example thin-walled parts which would be deformed
34、by this gauge. In these cases, checking should be carried out with a GO screw ring gauge. Similarly, only solid or adjustable NOT GO screw ring gauges should be used for non-rigid workpieces, for example thin-walled parts which would be deformed by checking with a NOT GO screw calliper gauge. A NOT
35、GO screw calliper gauge is used for checking the simple pitch diameter of an external thread. 3 IS0 1502:1996(E) 0 IS0 GO and NOT GO gauges are used for gauging the major diameter of an external thread of a workpiece. Whether a calliper or ring gauge is used is determined by the form and rigidity of
36、 the workpiece. Plain ring gauges should be used on non-rigid parts (see IS0 1938-I). 5.2 Gauging of internal threads GO and NOT GO screw plug gauges are used for gauging internal threads of a workpiece; GO and NOT GO plain plug gauges are used for gauging the minor hter of a workpiece thread (see I
37、S0 1938-l). I diamc 53 . 5.3.1 Inspection gauging By the manufacturer In general, the inspection department that checks the threads made in a workshop may use the same kind of gauges as are used in the workshop. Disagreement between manufacturing and inspection can occur when products close to the l
38、imits of sizes are gauged. When disputes do arise, it is recommended that the product be accepted if it is shown to be satisfactory by any gauge of the type concerned known to be within the requirements of this International Standard (taking into consideration the admissible wear). In cases of dispu
39、te, checking of the ring gauges by check plugs is decisive if there is no other agreement between the manufacturer and purchaser. NOTE 1 The possibility of disputes can be reduced to a minimum by grading the gauges so that those used by manufacturers provide a more stringent check than those used on
40、 inspection. Generally, this can be achieved by issuing to the workshops new or only slightly worn GO gauges and slightly worn NOT GO gauges. Inspection should be made with GO gauges which are approaching the condition of maximum permissible wear and with new NOT GO gauges. 5.32 By the purchaser The
41、re are three possible procedures, as listed below, for inspection of workpiece threads on behalf of the purchaser by an inspector who does not belong to the manufacturing plant concerned. a) The inspector gauges the workpiece threads with the manufacturers gauges. b) plugs which belong either to the
42、 manufacturing plant (manufacturer) or to the inspector (pur- chaser) or, as far as screw plugs are concerned, by direct measurement. The inspector the workpiece uses his own gauges for gauging threads. In cases of dispute it is recommended that the product be accepted if it is shown to be satisfac-
43、 tory by any gauge of the type concerned known to be within the requirements of this International Standard (taking into consideration the admissible wea r). c) The inspector uses his own inspection gauges for gauging the workpiece threads. The position of the tolerance zone for these gauges shall b
44、e such as to ensure that the pur- chaser does not reject threads whose actual size lies within the limits specified for the workpiece. This International Standard does not specify which gauges are to be used by the inspector; it only rec- ommends that the purchaser inform the manufacturer when order
45、ing what procedure will be employed for the inspection of the workpiece threads. Worn gauges shall not be used for sample inspection. 6 Reference temperature In accordance with IS0 1, the dimensions of both the gauge and the workpiece are related to a temperature of 20 “C. If the workpieces and gaug
46、es have the same coef- ficient of linear expansion (e.g. steel workpieces and steel gauges), the checking temperature may deviate from 20 “C without detriment to the results, provided that the temperatures of both gauges and workpieces are the same. If the workpieces and gauges have different co- ef
47、ficients of linear expansion e.g. steel workpieces and carbide gauges or brass workpieces and gauges of steel (or carbide), the temperature of both shall be (20 + 2) “C at the time of gauging. Otherwise the difference between the thermal expansions of the workpiece and the gauge shall be taken into
48、consid- eration. 7 Function, checking and use of gauges Throughout this clause, the designations of para- graphs are as follows: In this case, the accuracy of the gauges used may be checked by means of check plugs and setting 4 a) function; Q IS0 IS0 1502:1996(E) b) control; 7.1.2 Screw check plugs
49、for new solid GO screw ring gauges c) use. NOTE 2 In the absence of b), there is no specification for control. 7.1 Gauges for external threads of workpieces and their check plugs and setting plugs 7.1.1 Solid or adjustable GO screw ring gauges a) A GO screw ring gauge checks the virtual size of the external thread (gauging the virtual pitch di- ameter); i.e. it checks the maximum material limit of the pitch diameter, taking into account devi- ations of form and pitch errors and errors in flank angles, which produce an apparent enlargement of the pitch diameter (virtual pitch diameter)
