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. ISBN 978-0-626-22663-3 SANS 662:2009Edition 1.4Any reference to SABS 662 is deemedto be a reference to this standard(Government Notice No. 1373 of 8 Nove
4、mber 2002)SOUTH AFRICAN NATIONAL STANDARD Screwing taps Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 662:2009 Edition 1.4 Table of changes Change No. Date Scope Amdt 1 1967 Amended t
5、o change the length of the thread, the overall length, andthe dimensions of the shank and driving square in the case of hand taps and machine taps, to add a table giving the dimensions for taps having non-standard diameters and thread pitches and to make provisions for the use of welded-on shanks of
6、 medium carbon steel and for shank forms that differ from the standard forms. Amdt 2 1973 Amended to delete all references to metric screw threads. Amdt 3 1974 Amended to delete all references to British standard pipe (parallel and taper), American national pipe (straight and taper), British standar
7、d conduit and British standard cycle screw threads and to include hand taps for parallel and taper pipe threads of ISO form. Amdt 4 2009 Amended to change the designation of SABS standards to SANS standards, to update the definition of “acceptable“, to delete reference to the standardization mark sc
8、heme and to update the referenced standards. Acknowledgement The SABS Standards Division wishes to acknowledge the valuable assistance derived from publications of the British Standards Institution and the American Standards Association. Foreword This South African standard was approved by National
9、Committee SABS TC 1080, Handheld non-electrical tools for general purpose use, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was published in August 2009. This document supersedes SABS 662:1957 (first edition). A vert
10、ical line in the margin shows where the text has been technically modified by amendment Nos 1, 2, 3 and 4. SANS 662:2009 Edition 1.4 1 Contents Page Acknowledgement Foreword 1 Scope . 5 2 Definitions 6 3 Material 7 4 Constructional requirements . 7 4.1 Basic dimensions 7 Table 1 British Standard Whi
11、tworth (B.S.W.) 10 Table 2 British Standard Fine (B.S.F.) . 11 Table 3 British Association (B.A) . 13 Table 4 ISO pipe thread (parallel) . 14 Amdt 3 Table 5 ISO pipe thread (taper) . 16 Amdt 3 Table 6 Deleted by amendment No. 3 Table 7 Deleted by amendment No. 3 Table 8 Unified coarse (UNC) . 18 Tab
12、le 9 Unified fine (UNF) . 19 Table 10 Deleted by amendment No. 3 Table 11 Deleted by amendment No. 3 Table 12 Deleted by amendment No. 3 Table 13 Deleted by amendment No. 2 4.2 Overall dimensions and tolerances . 19 Table 14 Hand and machine taps B.S.W., B.S.F., and UNC threads 21 Amdt 1 Table 14A H
13、and and machine taps UNF threads . 23 Amdt 1 Table 15 Hand and machine taps B.A. threads 24 Amdt 1 Table 16 Hand taps, ISO pipe (parallel) 26 Amdt 3 Table 17 Hand taps, ISO pipe (taper) 26 Amdt 3 Table 18 Deleted by amendment No. 2 Table 19 Deleted by amendment No. 3 Table 20 Deleted by amendment No
14、. 3 Table 21 Deleted by amendment No. 3 Table 21A Dimensional tolerances for hand and machine taps with BSW, BSF, BA, UNC, UNF, and metric coarse threads 27 Amdt 1 Table 22 Pulley taps, B.S.W., B.S.F., UNC and UNF . 28 Table 23 Dimensional tolerances for pulley taps . 28 Table 24 Regular nut taps,B.
15、S.W., B.S.F., UNC and UNF 29 Table 25 Regular nut taps,B.A. . 30 Table 26 Deleted by amendment No. 3 Table 27 Deleted by amendment No. 2 SANS 662:2009 Edition 1.4 2 Contents (continued) Page Table 28 Short pattern nut taps, B.S.W., B.S.F., UNC and UNF 31 Table 29 Dimensional tolerances for nut taps
16、. 32 Table 30 Straight shank tapper taps, B.S.W., B.S.F., UNC and UNF . 33 Table 31 Dimensional tolerances for straight shank tapper taps 33 Table 32 Bent shank tapper taps, B.S.W., B.S.F., UNC and UNF 35 Table 33 Dimensional tolerances for bent shank tapper taps . 36 Table 34 Pearn tapper taps, B.S
17、.W., B.S.F., UNC and UNF 37 Table 35 Deleted by amendment No. 3 Table 36 Pearn tapper tap shanks 38 Table 37 Dimensional tolerances for pearn tapper taps 38 Table 37A Generalized values of shank diameter, overall length, and thread length 39 Amdt 1 4.3 Thread dimensions and tolerances . 42 Table 38
18、B.S.W. Zone 1 43 Table 39 B.S.W. Zone 2 43 Table 40 B.S.W. Zone 3 44 Table 41 B.S.W. Zone 4 45 Table 42 B.S.F. Zone 1 46 Table 43 B.S.F. Zone 2 47 Table 44 B.S.F. Zone 3 48 Table 45 B.S.F. Zone 4 49 Table 46 UNC Zone 1 50 Table 47 UNC Zone 2 51 Table 48 UNC Zone 3 52 Table 49 UNC Zone 4 53 Table 50
19、UNF Zone 1 54 Table 51 UNF Zone 2 54 Table 52 UNF Zone 3 55 Table 53 UNF Zone 4 55 Table 54 B.A. Zone 3 . 56 Table 55 Deleted by amendment No. 3 Table 56 ISO pipe thread (parallel) Zone 2 . 56 Amdt 3 Table 57 ISO pipe thread (parallel) Zone 3 . 57 Amdt 3 Table 58 ISO pipe thread (parallel) Zone 4 .
20、57 Amdt 3 Table 59 Deleted by amendment No. 2 Table 60 Deleted by amendment No. 2 Table 61 Deleted by amendment No. 2 Table 62 Deleted by amendment No. 2 Table 63 Deleted by amendment No. 3 Table 64 Deleted by amendment No. 3 Table 65 Deleted by amendment No. 3 Table 66 Deleted by amendment No. 3 Ta
21、ble 67 Deleted by amendment No. 3 Table 68 Deleted by amendment No. 3 Table 69 Deleted by amendment No. 3 Table 70 Deleted by amendment No. 3 Table 71 Deleted by amendment No. 3 Table 72 Tolerance on cumulative pitch error . 59 SANS 662:2009 Edition 1.4 3 Contents (concluded) Page 4.4 General requir
22、ements (all thread systems) . 59 Table 73 Chamfer on hand taps 59 4.5 Hardness . 60 5 Marking . 60 6 Sampling and compliance with specification 61 Appendix 7 Recommended chemical compositions 62 Table 74 Chemical composition of carbon steel 62 Table 75 Chemical composition of high speed tool steel 6
23、2 8 Tolerances 63 Table 76 Formulae for limits and tolerances for taps (threads of Whitworth form and threads of Unified form) . 70 Amdt 3 Table 77 Formulae for limits and tolerances for taps (B.A. threads) . 71 Table 78 Deleted by amendment No. 2 Table 79 Tolerance on angle (threads of Whitworth fo
24、rm and threads of Unified form) . 72 Amdt 3 Table 80 Tolerance on angle (B.A. thread form) . 73 Table 81 Deleted by amendment No. 2 9 Rounding off of calculated tolerances . 73 Table 82 Basic formulae elements based on pitch (Whitworth thread form) . 75 Table 83 Deleted by amendment No. 3 Table 84 B
25、asic formulae elements based on pitch (Unified thread form) . 76 Table 85 Deleted by amendment No. 2 Table 86 Deleted by amendment No. 2 Table 87 Basic formulae elements based on nominal diameter (Whitworth and Unified threads) . 77 Table 88 Deleted by amendment No. 3 Table 89 Deleted by amendment N
26、o. 3 Table 90 Deleted by amendment No. 3 Table 91 Deleted by amendment No. 3 Table 92 Deleted by amendment No. 2 Table 93 Deleted by amendment No. 2 10 Measurement of minor diameter . 78 Table 94 Threads of Whitworth form . 79 Table 95 B.A. threads 80 Table 96 Deleted by amendment No. 3 Table 97 Thr
27、eads of Unified form 80 Table 98 Deleted by amendment No. 2 SANS 662:2009 Edition 1.4 4 This page is intentionally left blank SANS 662:2009 Edition 1.4 5 Screwing taps 1 Scope 1.1 This specification covers the dimensional and physical requirements for screwing taps of (a) the types and (b) the threa
28、d systems listed below: a) Types i) Hand and machine, Amdt 1 ii) pulley, iii) nut, regular, iv) nut, short pattern, v) tapper, straight shank, vi) tapper, bent shank, and vii) tapper, Pearn. NOTE The attention of users of this specification is drawn to the following: a) The following requirements sh
29、all be specified in the order or contract: 1) Whether hand taps or machine taps are required (see table 21A and 4.4.8) 2) In the case of machine taps, the chamfer required (see 4.4.2.3) b) The following requirements may be specified in the order or contract: That shank forms differing from the stand
30、ard forms are required and full details of such shanks (see 4.2 as amended). Amdt 1 b) Thread systems, in four tolerance zones i) British Standard Whitworth, ii) British Standard Fine, iii) British Association, iv) Unified, coarse, Amdt 3 SANS 662:2009 Edition 1.4 6 v) Unified, fine, Amdt 3 vi) ISO
31、pipe (parallel), and Amdt 3 vii) ISO pipe (taper). Amdt 3 2 Definitions 2.1 For the purposes of this specification the following definitions shall apply: angle of thread thread angle the angle between the flanks measured in an axial plane section back taper a slight relief axially, which makes the e
32、ffective diameter of the thread near the shank somewhat smaller than at the chamfer chamfer the tapering end of the thread, obtained by cutting away the crest of the first few threads (see figure 1) diameter and sizes basic size the ideal size from which all variations are made major diameter the la
33、rgest diameter of the thread on a straight tap (see figure 1) effective diameter (of a parallel thread) the diameter of an imaginary cylinder which would pass the threads at such points as to make the width of the thread and the width of the spaces between the threads at these points equal (see figu
34、re 1) minor diameter the smallest diameter of the thread on a straight tap (see figure 1) nominal size the size by which a dimension or part is referred to as a matter of convenience lead (of a screw thread) the distance a screw thread advances axially in one revolution pitch (of a screw thread) the
35、 distance, measured parallel to its axis, between corresponding points on adjacent thread forms in the same axial plane radial relief the condition whereby metal is removed from behind the cutting edge to produce clearance and reduce friction (see figure 1) rake the deviation of the cutting face of
36、the tooth from the radial (see figure 1) SANS 662:2009 Edition 1.4 7 Sampling and inspection acceptable acceptable to the authority administering this standard, or to the parties concluding the purchase contract, as relevant Amdt 4 defective that screwing tap which does not comply in one or more res
37、pects with the relevant requirements of the specification lot not more than 1 000 screwing taps of the same type, thread system, size and tolerance zone, from the same manufacturer, submitted at any one time for inspection and test 3 Material 3.1 General The material used for the manufacture of scre
38、wed part of the taps shall be an acceptable high-carbon tool steel, alloy tool steel, or high-speed toll steel1). The shanks may be integral with the screwed part, or may be made from a medium carbon steel of adequate strength and hardness and butt-welded to the screwed part in an acceptable manner.
39、 Amdt 1 4 Constructional requirements 4.1 Basic dimensions The basic thread form of taps shall be in accordance with figures 2 to 7 and the basic thread sizes shall conform to the dimensions given in tables 1 to 5 and 8 and 9, where relevant. Amdt 3 1) Recommended chemical compositions and heat trea
40、tments are given in the appendix. SANS 662:2009 Edition 1.4 8 A Overall length B Thread length C Length of square D Shank diameter E Size of square F Chamfer S Shank length Figure 1 Nomenclature for taps SANS 662:2009 Edition 1.4 9 d Major diameter d1 Minor diameter p Pitch H 0960491 p h 0640327 p r
41、 0137329 p Figure 2 British standard Whitworth thread SANS 662:2009 Edition 1.4 10 Table 1 British Standard Whitworth Basic sizes (see figure 2) 1 2 3 4 5 6 7 Nominal diameter Pitch Depth of thread Major diameter Effective diameter Minor diameter in. No. of threads per in. in. in. in. in. in. 1/83/1
42、61/440 24 20 002500 004167 005000 00160 00267 00320 01250 01875 02500 01090 01608 02180 00390 01341 01860 5/163/87/1618 16 14 05556 006250 007143 00356 00400 00457 03125 03750 04375 02769 03350 03918 02413 02950 03461 1/29/165/812 12 11 008333 008333 009091 00534 00534 05282 05000 05625 06250 04466
43、05091 05668 03932 04557 05086 11/163/47/811 10 9 009091 010000 011111 00582 00640 00711 06875 07500 08750 06293 06860 08039 05711 06220 07328 1 11/811/48 7 7 012500 014286 014286 00800 00915 00915 10000 11250 12500 09200 10335 11585 08400 09420 10670 11/213/42 6 5 4 5 016667 020000 022222 01067 0128
44、1 01423 15000 17500 20000 13933 16219 18577 12866 14938 17154 21/421/223/44 4 3 5 025000 025000 028571 01601 01601 01830 22500 25000 27500 20899 23399 25670 19298 21798 23840 3 31/431/23 5 3 25 3 25 028571 030769 030769 01830 01970 01970 30000 32500 35000 28170 30530 33030 26340 28560 31060 33/44 3
45、3 033333 033333 02134 02134 37500 40000 35366 37866 33232 35732 SANS 662:2009 Edition 1.4 11 Table 2 British Standard Fine Basic sizes (see figure 2) 1 2 3 4 5 6 7 Nominal diameter Pitch Depth of thread Major diameter Effective diameter Minor diameter in. No. of threads per in. in. in. in. in. in. 3
46、/167/321/432 28 26 003125 003571 003846 00200 00229 00246 01875 02188 02500 01675 01959 02254 01475 01730 02008 9/325/163/826 22 20 003846 004545 005000 00246 00291 00320 02812 03125 03750 02566 02834 03430 02320 02543 03110 7/161/29/1618 16 16 005556 006250 006250 00356 00400 00400 04375 05000 0562
47、5 04019 04600 05225 03663 04200 04825 5/811/163/414 14 12 007143 007143 008333 00457 00457 00534 06250 06875 07500 05793 06418 06966 05336 05961 06432 13/167/81 12 11 10 008333 009091 010000 00534 00582 00640 08125 08750 10000 07591 08168 09360 07057 07586 08720 11/811/413/89 9 8 011111 011111 01250
48、0 00711 00711 00800 11250 12500 13750 10539 11789 12950 09828 11078 12150 11/215/813/48 8 7 012500 012500 014286 00800 00800 00915 15000 16250 17500 14200 15450 16585 13400 14650 15670 2 21/421/27 6 6 014286 016667 016667 00915 01067 01067 20000 22500 25000 19085 21433 23933 18170 20366 22866 23/43 6 5 016667 020000 01067 01281 27500 30000 26433 28719 25366 27438 SANS 662:2009 Edition 1.4 12 d Major diameter d1 Minor diameter p Pitch H 113634 p r 018083 p S 026817 p h 060000 p Figure 3 British Association thread Table 3 British Association
