BS 2559-1994 Specification for screwdrivers and screwdriver accessories《螺丝起子和螺丝起子附件规范》.pdf

1、BRITISH STANDARD BS 2559:1994 Specification for Screwdrivers and screwdriver accessoriesBS2559:1994 This British Standard, having been prepared under the directionof the Machine, Engineers and Hand Tools Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into

2、 effect on 15 January1994 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference MTE/15 Draft for comment 89/74346 DC ISBN 0 580 21823 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Machine,

3、Engineers and Hand Tools Standards Policy Committee (MTE/-) to Technical Committee MTE/15, upon which the following bodies were represented: British Coal Corporation British Telecommunications plc Consumer Policy Committee of BSI Federation of British Hand Tool Manufacturers Handle Manufacturers Ass

4、ociation Institute of Carpenters Institute of Trading Standards Administration Ministry of Defence The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Industrial Fasteners Federation Society of Motor Manufacturers and Traders Limited

5、Amendments issued since publication Amd. No. Date CommentsBS2559:1994 BSI 08-1999 i Contents Page Committees responsible Inside front cover Foreword iii 1 Scope 1 2 References 1 3 Nomenclature 1 4 Materials 1 5 Heat treatment and hardness 2 6 Assembly 3 7 Finish 4 8 Design and dimensions 4 9 Marking

6、 5 Annex A (informative) Cabinet screwdrivers 24 Annex B (informative) London pattern screwdrivers 26 Annex C (normative) Torque test 28 Annex D (informative) Safe usage 30 Figure 1 Slotted head screwdriver: nomenclature 6 Figure 2 Crossed-recess head screwdriver: nomenclature 6 Figure 3 Ratchet scr

7、ewdriver: nomenclature 6 Figure 4 Ratchet screwdriver: interchangeable bits: nomenclature 7 Figure 5 Spiral ratchet screwdriver: nomenclature 8 Figure 6 Jewellers screwdriver: nomenclature 9 Figure 7 Typical handle shapes 11 Figure 8 Spiral ratchet screwdrivers: bits for slotted head screws:overalld

8、imensions 14 Figure 9 Jewellers screwdriver: slotted head: design 15 Figure 10 Slotted head screwdrivers: tip forms 16 Figure 11 Crossed-recess head screwdrivers: details of point: type PH 17 Figure 12 Crossed-recess head screwdrivers: details of point: type PZ 18 Figure 13 Crossed-recess head screw

9、drivers: details of point: type SD 19 Figure 14 Spiral ratchet screwdrivers: bits for cross-recessed head screws:overall dimensions 22 Figure 15 Jewellers screwdriver: crossed-recess head: design 23 Figure A.1 Cabinet screwdriver: design 24 Figure B.1 Flat blade (London pattern) screwdriver: design

10、26 Figure C.1 Diagrammatic representation of the principle of a torquetestingdevice 28 Figure C.2 Torque testing die 30 Table 1 Proof torque requirements 10 Table 2 Slotted head screwdrivers: tip sizes 12 Table 3 Slotted head screwdrivers: blade lengths 12 Table 4 Ratchet screwdrivers for slotted he

11、ad screws: light duty 12 Table 5 Ratchet screwdrivers for slotted head screws: heavy duty 12 Table 6 Spiral ratchet screwdrivers: bits for slotted head screws: tipdimensions 13 Table 7 Jewellers screwdriver for slotted head screws: blade/tip dimensions,proof torque 13BS2559:1994 ii BSI 08-1999 Page

12、Table 8 Crossed-recess head screwdrivers: dimensions of points: type PH 20 Table 9 Crossed-recess head screwdrivers: dimensions of points: type PZ 20 Table 10 Crossed-recess head screwdrivers: dimensions of points: type SD 20 Table 11 Crossed-recess head screwdrivers: blade lengths: all typesPH,PZ,S

13、D 21 Table 12 Ratchet screwdrivers for cross-recessed head screws: heavy duty 21 Table 13 Spiral ratchet screwdrivers: bits for cross-recessed head screws:tipdimensions 21 Table 14 Jewellers screwdrivers for cross-recessed head screws: blade/tip dimensions, proof torque, type PH 21 Table A.1 Cabinet

14、 screwdriver: dimensions 25 Table B.1 Flat blade (London pattern) screwdriver: dimensions 27 Table C.1 Torque testing die for screwdriver blades and bits: slottedheadscrews: dimensions 29 Table C.2 Torque testing die for screwdriver blades and bits: cross-recessed head screws: dimensions 29 List of

15、references Inside back coverBS2559:1994 BSI 08-1999 iii Foreword This British Standard has been prepared under the direction of the Machine, Engineers and Hand Tools Standards Policy Committee. The main features of this revision are: a) metrication of all dimensions; b) consolidation of Parts 1, 2,

16、4 and 5 of the previous issue and the addition of jewellers screwdrivers; c) some rationalization of screwdriver sizes has been made. This standard supersedes BS2559-1:1971, BS2559-2:1973, BS2559-4:1973 and BS2559-5:1974, which are now withdrawn. NOTEBS 2559-3 will be replaced by a European Standard

17、 on insulated tools, in due course. The illustrations in this standard are examples only and are not intended to affect manufacturers designs. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct appli

18、cation. 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 to iv, pages1to 30, an inside back cover and a back cover. This standard has been updated (see copyright date)

19、and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankBS2559:1994 BSI 08-1999 1 1 Scope This British Standard specifies requirements for the manufacture, testing and prime dimensions relating to screwdrivers of the following types.

20、a) Screwdrivers and screwdriver blades and bits for use with slotted head screws. b) Screwdrivers and screwdriver blades and bits for use with cross-recessed head screws. NOTE 1PZ Screwdrivers are suitable for driving Pozidriv(R) and Supadrive (R) cross-recessed head screws. PH screwdrivers are suit

21、able for driving Phillips (R) cross-recessed head screws only. 1) c) Screwdrivers with sleeved blades for use on low d.c.voltage apparatus up to and including 24 V d.c. d) Screwdrivers that incorporate a ratchet mechanism capable of reverse drive. e) Screwdrivers worked by a ratchet mechanism and a

22、spindle having a double spiral track, the tool being operated by a reciprocating motion of the handle. f) Jewellers screwdrivers comprising a pencil-shaped body and rotating head, with either fixed or replaceable blades, for use on miniature screws. 2 References 2.1 Normative references This British

23、 Standard incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications app

24、ly to this British Standard only when incorporated in it by updating or revision. 2.2 Informative reference This British Standard refers to another publication that provides information. The edition of this publication current at the time of issue of this standard is given on the inside back cover,

25、but reference should be made to the latest edition. 3 Nomenclature For the purposes of this British Standard the nomenclature given inFigure 1, Figure 2, Figure 3, Figure 4, Figure 5 andFigure 6 applies. 4 Materials 4.1 Screwdriver blades and bits Screwdriver blades and bits shall be manufactured fr

26、om steel which, when suitably heat treated, satisfies the mechanical and performance criteria specified in this standard. 4.2 Handles 4.2.1 Wood Wooden handles shall be manufactured from beech or other suitable hardwood. The wood shall be free from defects which could compromise performance. The moi

27、sture content shall be within the range 10% to 15% by mass. NOTEUnsuitable atmospheres and environments can cause changes in the moisture content of tool handles which in turn can adversely affect performance. 4.2.2 Plastics Plastics handles shall be manufactured from a material which will fully wit

28、hstand the performance criteria specified in this standard. 4.3 Ferrules Ferrules shall be made of a material conforming to either one of the following specifications. a) Steel of minimum thickness 0.8 mm conforming to BS1449-1.1:1991 or to BS970-1:1991. b) Brass 70/30 of minimum thickness1.6mm conf

29、orming to BS2871-2:1972. 4.4 Blade sleeving Screwdrivers for use on low d.c.voltage electrical apparatus up to 24V d.c.shall be sleeved with a PVC or other material to provide insulation sufficient to meet the following conditions: a) mechanical properties equivalent or superior to those of PVC; b)

30、minimum specific resistance; 10 107/cm at23 C; c) minimum thickness of sleeve; 0.8mm. NOTEPlastics materials may be affected by contact with certain mineral and organic substances and can be changed mechanically over a period of time, resulting in the degradation of their insulation properties. 4.5

31、Ratchet screwdriver components 4.5.1 Ratchet wheel The ratchet wheel shall be manufactured from steel conforming to BS970-1:1991 and shall be capable of achieving the hardness requirements specified in5.3.1. 1) This information is given for the convenience of users of this British Standard and does

32、not constitute an endorsement by BSI of the product.BS2559:1994 2 BSI 08-1999 4.5.2 Ratchet pawls The pawl shall be manufactured from steel conforming to BS1449-1.1:1991 and shall be capable of achieving the hardness requirements specified in5.3.2. 4.5.3 Ratchet mechanism housing The housing shall b

33、e manufactured from either a zinc alloy conforming to BS1004:1972 (alloy A) or a steel conforming to BS970-1:1991. 4.5.4 Ratchet sleeve The sleeve shall be manufactured from brass as specified in BS2870:1980 or from steel conforming to BS6323-2:1982. 4.5.5 Switch spring The switch spring shall be ma

34、nufactured from a suitable spring steel conforming to BS1449-1.1:1991. 4.6 Spiral ratchet screwdriver components 4.6.1 Spindle The spindle shall be manufactured from steel conforming to BS970-1:1991. 4.6.2 Nuts The nuts shall be made from brass conforming to BS2874:1986. 4.6.3 Pawl The pawl shall be

35、 manufactured from steel conforming to BS1449-1.1:1991 and shall be capable of achieving the hardness requirements specified in5.3.2. 4.6.4 Ratchet mechanism housing The housing shall be manufactured from either a zinc alloy conforming to BS1004:1972 (alloy A) or a steel conforming to BS970-1:1991.

36、4.6.5 Ratchet sleeve The sleeve shall be manufactured from brass as specified in BS2870:1980 or from steel conforming to BS6323-2:1982. 4.6.6 Return spring The return spring shall be manufactured from a steel conforming to BS5216:1991. 4.6.7 Chuck The chuck body shall be manufactured from a steel co

37、nforming to BS970-1:1991. 4.6.8 Handle tube The handle tube shall be manufactured from steel tube conforming to BS6323-2:1982. 4.6.9 Switch spring The switch spring shall be manufactured from a suitable spring steel conforming to BS1449-1.1:1991. 4.7 Jewellers screwdrivers 4.7.1 Nose cap, collet and

38、 body The nose cap, collet and body shall be manufactured from steel conforming to BS970-1:1991 or brass conforming to BS2874:1986. 4.7.2 Revolving head The revolving head shall be manufactured from either metal or plastics. 5 Heat treatment and hardness 5.1 Blades and bits for slotted head screws T

39、he screwdriver blades and bits shall be hardened and tempered to a hardness on the Rockwell “C” scale of 48HRC to 56HRC (see BS891:1989) for a distance at least three times its tip width from the tip. The hardness shall be taken on a prepared flat surface of sufficient area to provide a reliable rea

40、ding. The tang may be left untreated but the components shall be capable of meeting the torque criteria specified within this standard. 5.2 Blades and bits for cross-recessed head screws The screwdriver blades and bits shall be hardened and tempered to a hardness on the Rockwell “C” scale of 58HRC t

41、o 64HRC (see BS891:1989). The specified hardness values shall be maintained for a minimum distance of 3 nominal blade diameter from the driving end. The hardness shall be taken on a prepared flat surface of sufficient area to provide a reliable reading. 5.3 Ratchet screwdriver and spiral ratchet scr

42、ewdriver components 5.3.1 Ratchet wheel Where a case hardening steel is used, the ratchet wheel shall be case hardened to a minimum depth of0.13mm and offer a hardness within the range of515HV to615HV (see BS427:1990). 5.3.2 Pawls When pawls are manufactured from spring steel conforming to BS1449-1.

43、1:1991 they shall be heat treated to a hardness of46HRC to 50HRC (seeBS891:1989) and when manufactured from steel suitable for case hardening, they shall be heat treated to a hardness in the range515HV to615HV (see BS427:1990). NOTEAlternative values of hardness may be used in accordance with BS860.

44、BS2559:1994 BSI 08-1999 3 6 Assembly 6.1 General Fully assembled screwdrivers shall be capable of achieving the proof test torque values as specified inTable 1. After testing, the handle of the screwdriver shall have remained securely attached to the blade. After the application of the proof torque

45、appropriate to the size of screwdriver blade under test there shall be no sign of permanent deformation or fracture, or any other damage which could influence the usability of the tool. 6.2 Screwdrivers for slotted and cross-recessed head screws The handle shall be securely fixed and shall be parall

46、el to and concentric with the blade. The assembly shall be capable of meeting the torque criteria specified in this standard. Ferrules on wood handles shall be securely locked in position. Insulation sleeves for screwdrivers intended for use on live electrical apparatus up to24V d.c.shall be shrunk

47、into position over the full length of the sleeve resulting in a secure interference fit. There shall be no visible gap between the sleeve and the handle. 6.3 Ratchet screwdrivers 6.3.1 The tool shall have three main components: the blade, the ratchet mechanism and the handle. Provision shall be made

48、 for withstanding the end thrust by means of a hardened steel ball or other suitable means. 6.3.2 The ratchet wheel shall be positively fixed to the blade. Where a switch of the type shown inFigure 3 is fitted, the ratchet mechanism shall have the following three positive working positions: a) with

49、the switch in the central position the blade shall be locked; b) with the switch in the forward position the blade shall drive in a clockwise direction; c) with the switch in the rear position the blade shall drive in an anti-clockwise direction. The complete ratchet mechanism shall be suitably encased for user and mechanism protection. The ratchet mechanism shall not slip in any working position under the torque requirements specified in this standard. The maximum free rotational movement in t