1、BRITISH STANDARD BS 328-5: 1983 Incorporating Amendment No. 1 Drills and reamers Part 5: Specification for the dimensions of counterbores with Morse taper shanks and countersinks with parallel shanks without solid pilots and Morse taper shanks UDC 621.951.4 181BS328-5:1983 This British Standard, hav
2、ing been prepared under the directionof the Mechanical Engineering Standards Committee, was published underthe authority of the BoardofBSI and comes intoeffecton 29July1983 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference MEE/73 Draft for comment 78/7
3、5479 DC ISBN 0 580 13264 1 Committees responsible for this British Standard This British Standard was published under the direction of the Mechanical Engineering Standards Committee MEE/-. Its preparation was entrusted to Technical Committee MEE/73 upon which the following bodies were represented: G
4、auge and Tool Makers Association Institution of Production Engineers Machine Tool Industry Research Association Ministry of Defence Society of British Aerospace Companies Limited Twist Drill and Reamer Association Amendments issued since publication Amd. No. Date of issue Comments 7211 July 1992 Ind
5、icated by a sideline in the marginBS328-5:1983 BSI 01-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Text deleted 1 4 Counterbores with Morse taper shanks and detachable pilots 1 5 Countersinks with parallel shanks 1 6 Countersinks with Morse t
6、aper shanks 1 Appendix A Related tolerances extracted from BS 4500-1 6 Appendix B Counterbores with cutting diameters dimensioned in inches 7 Figure 2 Counterbore with Morse taper shank and detachable pilot 1 Figure 3 Detachable pilot 3 Figure 4 Countersink with parallel shank 3 Figure 5 Countersink
7、 with Morse taper shank 3 Figure 6 Counterbore with parallel shank and integral pilot 7 Figure 7 Counterbore with Morse taper shank and detachable pilot 8 Table 3 Counterbores with Morse taper shanks and detachable pilots. General dimensions 2 Table 4 Counterbores with Morse taper shanks and detacha
8、ble pilots. Diameters 2 Table 5 Detachable pilots. Dimensions 4 Table 6 Countersinks with parallel shanks. Dimensions 5 Table 7 Countersinks with Morse taper shanks. Dimensions 5 Table 8 Limits of tolerance e8 6 Table 9 Limits of tolerance f7 6 Table 10 Limits of tolerance h9 6 Table 11 Limits of to
9、lerance z9 7 Table 12 Limits of tolerance H8 7 Table 13 Counterbores with parallel shanks and integral pilots (inch series). Diameters 8 Table 14 Counterbores with Morse taper shanks and detachable pilots (inch series). Diameters 9 Publications referred to Inside back coverBS328-5:1983 ii BSI 01-200
10、0 Foreword This Part of BS 328 is published under the direction of the Mechanical Engineering Standards Committee. It has been prepared to take account of the international work on countersinks and counterbores which specifies the general dimensions of these tools in millimetres only. It is recogniz
11、ed, however, that counterbores with cutting diameters dimensioned in inches will be required for some time to come and hence preferred inch diameters are given inAppendix B. All other dimensions are in metric units, thus allowing the same blanks to be used for both inch and metric cutting tools. BS
12、328 whose Parts1 and2 have hitherto been issued under the generic title “Twist drills and combined drills and countersinks” is now being issued as a series under the generic title “Drills and reamers”, of which this standard is Part5: Some Parts of this series have already been published with the re
13、maining Parts in course of preparation. The other Parts of BS328 are: Part 1: Twist drills 1) ; Part 2: Centre drills 2) ; Part 3 Core drills 3) ; Part 4: Reamers; Part 6: 90 countersinks with parallel shanks and solid pilots; Part 7: Counterbores with parallel shanks and solid pilots; Part 8: Spot
14、drills. This Part of BS328 supersedes clauses21, 22 and23 of BS122-2:1964, the remaining clauses being superseded by BS328-4. BS 122-2:1964 is therefore withdrawn. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible fo
15、r their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 10, an inside back cover and a back cover. This standard has been update
16、d (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In course of revision, and will be published under the new generic title of “Drills and reamers”. 2) BS 328-2:1972 is being proposed for confirmation and will
17、be re-titled by amendment. 3) In course of preparation.BS328-5:1983 BSI 01-2000 1 1 Scope This Part of this British Standard specifies the dimensions of the following: a) counterbores with Morse taper shanks and detachable pilots; b) countersinks with parallel shanks; c) countersinks with Morse tape
18、r shanks. Appendix A shows extracts from BS4500-1, giving details of the tolerances specified. Appendix B specifies details of counterbores with cutting diameters designated in inches. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions
19、For the purposes of this Part of BS328 the following definitions apply. 2.1 counterbore a cutter with teeth on the periphery and the end, integral with either a parallel or a taper shank and having a pilot, the cutter being intended for the production of a flat seating to accommodate the head of a b
20、olt or set screw, etc. (see Figure 2) 2.2 pilot a cylindrical feature, either integral with a counterbore or detachable, that projects forward of the cutting end of the counterbore and is coaxial with it, and in use engages with a pre-drilled hole in the workpiece so that the flat seating produced b
21、y the counterbore is concentric with that hole (seeFigure 2 andFigure 3) 2.3 countersink a cutter with teeth on conical cutting faces, integral with a parallel or a taper shank, designed to produce a conical seating to accommodate the conical head of a component such as a screw or a rivet. The flute
22、s may be straight or helical (seeFigure 4 and Figure 5) 3 Text deleted 4 Counterbores with Morse taper shanks and detachable pilots 4.1 Flutes. Both right-hand and left-hand cutting counterbores are in conformity with this standard, but unless otherwise ordered, a counterbore shall be supplied with
23、right-hand helical teeth for right-hand cutting. 4.2 Dimensions. The general dimensions of counterbores with Morse taper shanks shall be as shown inTable 3 and their diameters as shown inTable 4 (seeFigure 2). The dimensions of detachable pilots shall be as shown inTable 5 (seeFigure 3). 5 Countersi
24、nks with parallel shanks 5.1 Dimensions. The dimensions of countersinks with parallel shanks shall be as shown inTable 6 (seeFigure 4). 6 Countersinks with Morse taper shanks 6.1 Dimensions. The dimensions of countersinks with Morse taper shanks shall be as shown in Table 7 (seeFigure 5). Figure 2 C
25、ounterbore with Morse taper shank and detachable pilotBS328-5:1983 2 BSI 01-2000 Table 3 Counterbores with Morse taper shanks and detachable pilots. General dimensions Table 4 Counterbores with Morse taper shanks and detachable pilots. Diameters Cutting diameter d (z9) Pilot diameter d 2(e8) Diamete
26、r of hole for pilot d 3(H8) Set screw size d 4 Overall length L Cutting length l Pilot shank l 3 Set screw position l 4 Morse taper shank no. over to over to mm mm mm mm mm mm mm mm mm 12.5 16.0 20.0 25.0 31.5 40.0 50.0 16.0 20.0 25.0 31.5 40.0 50.0 63.0 5.0 6.3 8.0 10.0 12.5 16.0 20.0 14.0 18.0 22.
27、4 28.0 35.5 45.0 56.0 4 5 6 8 10 12 16 M3 M4 M5 M6 M8 M8 M10 132 140 150 180 190 236 250 22 25 30 35 40 50 63 30 38 46 54 64 76 88 16 19 23 27 32 42 53 2 2 2 3 3 4 4 NOTE 1For values of the tolerances z9, e8 and H8 seeTable 11,Table 8 andTable 12 inAppendix A. NOTE 2Table 3 is in accordance with ISO
28、4207 except that that International Standard uses l 1for L, l 2for l and d 1for d. Preferred cutting diameter d (z9) Pilot diameter d 2(e8) Pilot shank diameter d 3(f7) Cap screw size Cap screw head diameter mm mm mm mm 15.0 6.8 8.4 9.0 a 4.0 M8 13.0 18.0 8.5 10.2 10.5 11.0 a 13.0 14.0 a 5.0 M10 16.
29、0 20.0 M12 18.0 24.0 12.0 15.0 16.0 a 6.0 M14 21.0 26.0 14.0 15.5 17.0 18.0 19.0 20.0 a 8.0 M16 24.0 30.0 M18 27.0 33.0 17.5 19.5 21.0 22.0 a 23.0 24.0 a 25.0 26.0 a 10.0 M20 30.0 36.0 M22 33.0 40.0 M24 36.0 a These are the preferred pilot diameters, being the diameters of clearance holes for the si
30、zes of cap screw indicated.BS328-5:1983 BSI 01-2000 3 Figure 3 Detachable pilot Figure 4 Countersink with parallel shank Figure 5 Countersink with Morse taper shankBS328-5:1983 4 BSI 01-2000 Table 5 Detachable pilots. Dimensions Pilot shank diameter d 2(f7) Pilot d 1(e8) diameter Pilot length l 1 Pi
31、lot shank length l 2 l 3 over up to mm mm mm mm mm mm mm 4 4 4 4 4 5.0 6.3 8.0 10.0 12.5 6.3 8.0 10.0 12.5 14.0 3.6 3.6 3.6 3.6 3.6 5 6 7 8 10 20 20 20 20 20 3 3 3 4 4 5 5 5 5 5 6.3 8.0 10.0 12.5 16.0 8.0 10.0 12.5 16.0 18.0 4.6 4.6 4.6 4.6 4.6 6 7 8 10 12 23 23 23 23 23 3 3 4 4 4 6 6 6 6 6 8.0 10.0
32、 12.5 16.0 20.0 10.0 12.5 16.0 20.0 22.4 5.5 5.5 5.5 5.5 5.5 7 8 10 12 15 28 28 28 28 28 4 4 4 5 5 8 8 8 8 8 10.0 12.5 16.0 20.0 25.0 12.5 16.0 20.0 25.0 28.0 7.5 7.5 7.5 7.5 7.5 8 10 12 15 18 32 32 32 32 32 4 4 5 5 5 10 10 10 10 10 12.5 16.0 20.0 25.0 31.5 16.0 20.0 25.0 31.5 35.5 9.1 9.1 9.1 9.1 9
33、.1 10 12 15 18 22 40 40 40 40 40 5 5 5 6 6 12 12 12 12 12 16.0 20.0 25.0 31.5 40.0 20.0 25.0 31.5 40.0 45.0 11.3 11.3 11.3 11.3 11.3 12 15 18 22 27 50 50 50 50 50 5 5 6 6 6 16 16 16 16 16 20.0 25.0 31.5 40.0 50.0 25.0 31.5 40.0 50.0 56.0 15.2 15.2 15.2 15.2 15.2 15 18 22 27 30 60 60 60 60 60 6 6 6 6
34、 6 NOTE 1For values of the tolerances f7 and e8 seeTable 8 andTable 9 inAppendix A. NOTE 2Table 5 is in accordance with ISO4208. a 0 0.1BS328-5:1983 BSI 01-2000 5 Table 6 Countersinks with parallel shanks. Dimensions Table 7 Countersinks with Morse taper shanks. Dimensions Nominal size d Small diame
35、ter d 2 b Overall length L Body length l 2 Shank diameter d 3(h9) ! = 60 ! = 90 and 120 ! = 60 ! = 90 and 120 mm mm mm mm mm mm mm 8.0 10.0 12.5 16.0 20.0 25.0 1.6 2.0 2.5 3.2 4.0 7.0 48 50 52 60 64 69 44 46 48 56 60 65 16 18 20 24 28 33 12 14 16 20 24 29 8 8 8 10 10 10 NOTE 1For values of the toler
36、ance h9 seeTable 10 inAppendix A. NOTE 2Table 6 is in accordance with ISO3294 except that that International Standard uses l 1for L and d 1for d. b Front end design optional. Nominal size d Small diameter d 2 b Overall length L Body length l 2 Morse taper shank no. ! = 60 ! = 90 and 120 ! = 60 ! = 9
37、0 and 120 mm mm mm mm mm mm 16.0 20.0 25.0 31.5 40.0 50.0 63.0 80.0 3.2 4.0 7.0 9.0 12.5 16.0 20.0 25.0 97 120 125 132 160 165 200 215 93 116 121 124 150 153 185 196 24 28 33 40 45 50 58 73 20 24 29 32 35 38 43 54 1 2 2 2 3 3 4 4 NOTETable 7 is in accordance with ISO3293 except that that Internation
38、al Standard uses l 1for L and d 1for d. c Front end design optional.BS328-5:1983 6 BSI 01-2000 Appendix A Related tolerances extracted from BS4500-1 A.1 Tolerances for shafts. Table 8toTable 11 give tolerance limits for shafts. Table 8 Limits of tolerance e8 Table 9 Limits of tolerance f7 Table 10 L
39、imits of tolerance h9 Pilot diameter Limits of tolerance Over Up to and including Upper Lower mm mm mm mm 3 6 3 6 10 0.014 0.020 0.025 0.028 0.038 0.047 10 18 30 18 30 50 0.032 0.040 0.050 0.059 0.073 0.089 NOTEThe tolerance e8 applies to the pilot diameters of counterbores with parallel shanks, and
40、 to the diameters of detachable pilots (seeTable1,Table2,Table 3,Table 4 andTable 5). Shank diameter Limits of tolerance Over Up to and including Upper Lower mm mm mm mm 3 6 3 6 10 0.006 0.010 0.013 0.016 0.022 0.028 10 18 30 18 30 50 0.016 0.020 0.025 0.034 0.041 0.050 NOTEThe tolerance f7 applies
41、to the shank diameters of detachable pilots (seeTable 4 andTable 5). Shank diameter Limits of tolerance Over Up to and including Upper Lower mm mm mm mm 3 6 3 6 10 0 0 0 0.025 0.030 0.036 10 18 30 18 30 50 0 0 0 0.043 0.052 0.062 NOTEThe tolerance h9 applies to the diameters of parallel shanks of co
42、unterbores (seeTable1) and of countersinks (seeTable 6).BS328-5:1983 BSI 01-2000 7 Table 11 Limits of tolerance z9 A.2 Tolerances on holes. Table 12 gives tolerance limits for holes. Table 12 Limits of tolerance H8 Appendix B Counterbores with cutting diameters dimensioned in inches B.1 Counterbores
43、 with parallel shanks and integral pilots. The diameters of inch series counterbores with parallel shanks, and the diameters of their pilots (seeFigure 6), shall be as shown inTable 13. The general dimensions of these counterbores shall be as shown inTable1. B.2 Counterbores with Morse taper shanks
44、and detachable pilots. The diameters of inch series counterbores with Morse taper shanks, and the diameters of their pilots (seeFigure 7), shall be as shown inTable 14. The general dimensions of these counterbores shall be as shown inTable 3, and of their pilots as shown inTable 5. Cutting diameter
45、Limits of tolerance Over Up to and including Upper Lower mm mm mm mm 3 6 10 3 6 10 14 + 0.051 + 0.065 + 0.078 + 0.093 + 0.026 + 0.035 + 0.042 + 0.050 14 18 24 30 40 18 24 30 40 50 + 0.103 + 0.125 + 0.140 + 0.174 + 0.198 + 0.060 + 0.073 + 0.088 + 0.112 + 0.136 NOTEThe tolerance z9 applies to the cutt
46、ing diameters of counterbores (seeTable1,Table 2,Table 3 andTable 4). Pilot hole diameter Limits of tolerance Over Up to and including Upper Lower mm mm mm mm 3 6 10 3 6 10 18 + 0.014 + 0.018 + 0.022 + 0.027 0 0 0 0 NOTEThe tolerance H8 applies to the diameter of the hole for the shank of the pilot
47、in Morse taper shank counterbores (seeTable 3 andTable 14). Figure 6 Counterbore with parallel shank and integral pilotBS328-5:1983 8 BSI 01-2000 Table 13 Counterbores with parallel shanks and integral pilots (inch series). Diameters Figure 7 Counterbore with Morse taper shank and detachable pilot P
48、referred cutting diameter d (z9) Pilot diameter d 2(e8) Cap screw size Cap screw head diameter in in in in 0.250 0.125 0.156 d 1 / 8 4BA 0.218 0.344 0.188 0.200 d 3 / 16 2BA 0.312 0.406 0.250 0.281 d 1 / 4 0BA 0.375 0.468 0.312 0.343 d 5 / 16 0.437 0.593 0.375 0.406 d 3 / 8 0.562 0.656 0.437 0.468 d
49、 7 / 16 0.625 0.781 0.500 0.531 d 1 / 2 0.750 NOTEFor values of the tolerances z9 and e8 in inches, seeBS1916-1. d These are the preferred pilot diameters, being the diameters of clearance holes for the sizes of cap screw indicated.BS328-5:1983 BSI 01-2000 9 Table 14 Counterbores with Morse taper shanks and detachable pilots (inch series). Diameters Preferred cutting diamete
