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1、BRITISH STANDARD BS 949-1:1992 Incorporating Corrigendum No. 1 Screwing taps Part 1: Specification of general dimensions ICS 25.100.50 ? Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 20:02:0
2、8 MDTNo reproduction or networking permitted without license from IHS -,-,- BS 949-1:1992 This British Standard, having been prepared under the direction of the Machine, Engineers and Hand Tools Standards Policy Committee, was published under the authority of the Standards Board and comes into effec
3、t on 31 January 1992 First edition October 1976 Second edition January 1992 The following BSI references relate to the work on this standard: Committee reference MTE/4 Draft for comment 90/79111 DC Committees responsible for this British Standard The preparation of this British Standard was entruste
4、d by the Machine, Engineers and Hand Tools Standards Policy Committee (MTE/-) to Technical Committee MTE/4, upon which the following bodies were represented: British Electrical Systems Association (BEAMA Ltd.) Federation of British Engineers Tool Manufacturers Screw Thread Tool Manufacturers Associa
5、tion ISBN 978 0 580 63379 9 BSI 2008 Amendments/corrigenda issued since publication Amd. No. DateComments C130 June 2008See Table 5 and Table 6 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008
6、20:02:08 MDTNo reproduction or networking permitted without license from IHS -,-,- BS 949-1:1992 i Contents Page Committees responsibleInside front cover Forewordii Section 1. General 0Introduction1 1Scope1 Section 2. General dimensions 2General dimensions of short machine or hand taps2 3General dim
7、ensions of long shank machine taps2 4General dimensions common to all types of tap2 Figure 1 Short machine or hand tap with full diameter shank and a tapered connecting portion between threaded portion and shank3 Figure 2 Short machine or hand tap with full diameter shank and an optional neck betwee
8、n threaded portion and shank4 Figure 3 Short machine or hand tap with reduced diameter shank6 Figure 4 Long shank machine tap8 Table 1 General dimensions of certain sizes of short machine or hand taps with nominal diameters over 0.9 mm and up to and including 2.8 mm3 Table 2 General dimensions of ce
9、rtain sizes of short machine or hand taps with nominal diameters over 2.8 mm and up to and including 10.0 mm4 Table 3 General dimensions of certain sizes of short machine or hand taps with nominal diameters over 10.0 mm6 Table 4 General dimensions of certain sizes of long shank machine taps8 Table 5
10、 Dimensional tolerances on overall lengths of all taps10 Table 6 Dimensional tolerances on shanks and squares of ground-threaded taps10 Publication(s) referred toInside back cover BSI 2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boe
11、ing Co/5910770001 Not for Resale, 08/14/2008 20:02:08 MDTNo reproduction or networking permitted without license from IHS -,-,- BS 949-1:1992 ii Foreword The revision of this Part of BS 949 has been prepared under the direction of the Machine, Engineers and Hand Tools Standards Policy Committee. It
12、supersedes BS 949-1:1976 which is withdrawn and those clauses and tables relating to the general dimensions of taps in BS 949-2:19791). In 1989 the European Committee for Standardization (CEN) endorsed ISO 2857 and ISO 5967, published by the International Organization for Standardization (ISO) as EN
13、 22857:1989 and EN 25967:1989 respectively. Both were given the status of national standards without modification with the publication of BS 949-4 (identical to EN 22857) and BS 949-5 (identical to EN 25967) which fulfils the United Kingdom obligations as a member of CEN in this respect. BS 949-1:19
14、76 has been revised to withdraw any conflicting requirements with EN 22857 and EN 25967 and is technically equivalent to Parts of ISO 5291) and ISO 2283 with amendment 01:1977, both of which were not adopted by CEN. When the revisions are complete, BS 949 will consist of the following Parts. Part 1:
15、 Specification of general dimensions; Part 2: Specification of unified thread taps manufacturing tolerances1); Part 3: Specification for pipe thread taps1); Part 4: Specification for metric thread taps manufacturing tolerances (identical to EN 22857); Part 5: Nomenclature and terminology (identical
16、to EN 25967). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This docum
17、ent comprises a front cover, an inside front cover, pages i and ii, pages 1 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) Revision
18、 in preparation. BSI 2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 20:02:08 MDTNo reproduction or networking permitted without license from IHS -,-,- BS 949-1:1992 1 Section 1. General
19、0 Introduction 0.1 Types of tap Two types of tap are specified in this Part of BS 949, namely short machine or hand taps (see 0.2) and long shank machine taps (see 0.3). 0.2 Short machine or hand taps The short machine or hand taps are specified in three patterns which differ in the shank of the tap
20、, not in the threaded portion. The three patterns are: a) taps in the size range over 0.9 mm and up to 2.8 mm which have a full diameter shank and a tapered connecting portion between the threaded portion and the shank (see Figure 1); b) taps in the size range over 2.8 mm and up to 10.0 mm which hav
21、e a full diameter shank and a neck between the threaded portion and the shank (see Figure 2); c) taps in the size range over 10.0 mm and up to 101.6 mm which have a reduced diameter shank (see Figure 3). 0.3 Long shank machine taps The long shank machine tap (size range over 2.8 mm and up to 26.5 mm
22、) is a tap with a reduced diameter shank (see Figure 4) but, for a given size of tap, the shank length is greater than that of the short tap. 1 Scope 1.1 This Part of this British Standard specifies the general dimensions and tolerances for screwing taps for the following threads: a) ISO metric coar
23、se pitch series threads complying with BS 3643; b) ISO metric fine pitch series threads complying with BS 3643; c) Unified (ISO inch) general-purpose screw threads, coarse thread series (UNC), from No. 1 to No. 12 and fromin to 4 in diameter complying with BS 1580-1, BS 1580-2 and BS 1580-3; d) Unif
24、ied (ISO inch) general-purpose screw threads, fine thread series (UNF), from No. 0 to No. 12 and fromin to 1in diameter complying with BS 1580-1, BS 1580-2 and BS 1580-3; e) British Standard Whitworth (BSW) threads from A in to 4 in diameter and British Standard Fine (BSF) threads fromin to 3 in dia
25、meter complying with BS 84; f) British Association (BA) threads from No. 14 to No. 0 complying with BS 93. 1.2 The sizes of taps specified include those suitable for the tapped holes for sparkings plugs and those suitable for the tapped holes for fittings for steel conduit specified in BS 4568. NOTE
26、The titles of the publications referred to in this standard are listed on the inside back cover. 1 4 - - 1 4 - - 1 2 - 3 16 - - BSI 2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 20:02:0
27、8 MDTNo reproduction or networking permitted without license from IHS -,-,- BS 949-1:1992 2 Section 2. General dimensions 2 General dimensions of short machine or hand taps The general dimensions of the sizes of short machine or hand taps are shown in Table 1, Table 2 and Table 3, and the tolerances
28、 on those dimensions shall be as shown in Table 5 and Table 6. 3 General dimensions of long shank machine taps The general dimensions of the sizes of long shank machine taps are as shown in Table 4 and the tolerances on those dimensions shall be as shown in Table 5 and Table 6. 4 General dimensions
29、common to all types of tap For all the taps specified in this Part of BS 949, the size and length of the driving square shall be related to the shank diameter. NOTE 1The relationship is in accordance with ISO 237. The point diameter of the tap shall be approximately equal to the basic minor diameter
30、 of the thread to be cut. The amount of the chamfer (or lead) of a tap shall be as follows: a) taper tap: approximately 4 per side; b) second tap: approximately 8 per side; c) bottoming tap: approximately 23 per side. NOTE 2The larger sizes of taps are customarily manufactured with internal centres.
31、 The smaller sizes of taps are manufactured with internal centres or external centres, at the manufacturers discretion. BSI 2008 Copyright British Standards Institution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 20:02:08 MDTNo
32、reproduction or networking permitted without license from IHS -,-,- BS 949-1:1992 3 Table 1 General dimensions of certain sizes of short machine or hand taps with nominal diameters over 0.9 mm and up to and including 2.8 mm Figure 1 Short machine or hand tap with full diameter shank and a tapered co
33、nnecting portion between threaded portion and shank 12345678910111213 Nominal diameter, dThread designationShank diameter Maximum thread length Overall length Length of tapered connecting portion and thread length Square AboveUp to and including ISO metric coarse ISO metric finea UNCUNFBAAFLength d1
34、l1Ll3al2 mmmmmmmmmmmmmmmm M1M1 0.2No. 14 0.901.25M1.1M1.1 0.2No. 135.538.510.0 M1.2M1.2 0.2 1.251.40M1.4M1.4 0.2No. 122.507.040.012.02.004 1.401.80M1.6M1.6 0.2No. 0 80No. 1113.0 M1.8M1.8 0.2No. 108.041.0 1.802.00M2M2 0.25No. 1 64 No. 1 72No. 913.5 M2.2M2.2 0.25No. 2 56 No. 2 64No. 8 2.002.80M2.5M2.5
35、 0.35No. 3 48 No. 3 56No. 72.809.544.515.52.245 No. 6 NOTEManufacturers, if they wish, may increase the thread length to a The pitches are preferred fine series pitches as shown in BS 3643. l1 l3l1 2 - -.+ BSI 2008 Copyright British Standards Institution Provided by IHS under license with BSI - Unco
36、ntrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 20:02:08 MDTNo reproduction or networking permitted without license from IHS -,-,- BS 949-1:1992 4 Table 2 General dimensions of certain sizes of short machine or hand taps with nominal diameters over 2.8 mm and up to and includi
37、ng 10.0 mm Figure 2 Short machine or hand tap with full diameter shank and an optional neck between threaded portion and shank 12345678910111213141516 Nominal diameter, d Thread designationShank diameter Maximum thread length Overall length Minimum diameter of neck Length of neck and thread length S
38、quare AboveUp to and including ISO metric coarse ISO metric fineb UNCUNFBSWBSFBAAFLength d1l1Ld2l3al2 mmmmmmmmmmmmmmmmmm M3M3 x 0.35No. 4 40No. 4 48No. 5 3.151148 2.803.202.12 2.50 No. 5 40No. 5 442.36185 3.203.60M3.5M3.5 0.35 No. 6 32No. 6 40No. 4 3.55502.50202.80 3.604.00M4M4 0.54.00132.803.15 532
39、16 4.004.50M4.5M4.5 0.5No. 8 32No. 8 36No. 3 4.503.153.55 4.505.00M5M5 0.5No. 10 24 No. 10 32No. 2 5.0016583.55254.00 267 5.005.60M5.5 0.55.6017624.50 No. 12 24 No. 12 28 No. 1 4.25 1 8 - -40 3 16 -24 3 16 - -32 7 32 -28 BSI 2008 Copyright British Standards Institution Provided by IHS under license
40、with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 20:02:08 MDTNo reproduction or networking permitted without license from IHS -,-,- BS 949-1:1992 5 Table 2 General dimensions of certain sizes of short machine or hand taps with nominal diameters over 2.8 mm and up
41、 to and including 10.0 mm 12345678910111213141516 Nominal diameter, d Thread designationShank diameter Maximum thread length Overall length Minimum diameter of neck Length of neck and thread length Square AboveUp to and including ISO metric coarse ISO metric fineb UNCUNFBSWBSFBAAFLength d1l1Ld2l3al2
42、 mmmmmmmmmmmmmmmmmm 5.606.35M6M6 0.75No. 06.304.505.00 M7M7 0.7519665.30 30 5.60 8 6.357.207.10 5.60 7.208.00M8M8 18.00 2272 6.00356.309 8.009.00M99.007.10367.1010 9.0010.00M10M10 1.2510.0024807.50398.0011 NOTEThe neck is optional at the manufacturers discretion. If the neck is not required, such ta
43、ps should have a thread length equal to. b The pitches are preferred fine series pitches as shown in BS 3643. 1 4 - -20 1 4 - -28 1 4 - -20 1 4 - -26 9 32 -26 5 16 - -18 5 16 - -24 5 16 - -18 5 16 - -22 3 8 - -16 3 8 - -24 3 8 - -16 3 8 - -20 l1 l3l1 2 - -+ BSI 2008 Copyright British Standards Insti
44、tution Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Boeing Co/5910770001 Not for Resale, 08/14/2008 20:02:08 MDTNo reproduction or networking permitted without license from IHS -,-,- BS 949-1:1992 6 Table 3 General dimensions of certain sizes of short machine or hand taps with
45、 nominal diameters over 10.0 mm Figure 3 Short machine or hand tap with reduced diameter shank 1234567891011121314151617 Nominal diameter, dThread designationShank diameter Standard blankFine pitch blankSquare AboveUp to and including ISO metric coarse ISO metric finea UNCUNFBSWBSFMaximum thread len
46、gth Overall length For threads finer than Maximum thread length Overall length AFLength d1l1LP Threads per inchl1Lal2 mmmmmmmmmmmmmmmmmmmm 10.0010.607.102484 Sizes up to and including 26.5 nominal diameter are made from the standard blank 5.608 10.6011.80M118.0025856.309 11.8013.20M12M12 1.259.00298
47、97.1010 13.2015.00M14M14 1.511.2030959.0012 15.0017.00M16M16 1.512.503210210.0013 17.0021.20 M18M18 1.5 14.003711211.2014 M20M20 1.5 21.2023.60M22M22 1.516.003811812.5016 23.6026.50M24M24 2.01 81 121 81 1018.00 45 13014.0018 26.5028.00M27M27 2.0 20.00 135 12716.0020 28.0030.00M30M30 2.0481382.501137 30.0033.50M33M33 2.022.405115113718.0022 7 16 -14 7 16 -20 7 16 -14 7 16 -18 1 2 - -13 1 2 - -20 1 2 - -12 1 2 - -16