1、BRITISH STANDARD CONFIRMED OCTOBER 1985 BS4235-2: 1977 ISO3912:1977 Specification for Metric keys and keyways Part2: Woodruff keys and keyways ISO title: Woodruff keys and keyways UDC 621.886.6BS4235-2:1977 This British Standard, having been prepared under the directionof the Mechanical Engineering
2、Standards Committee, was published underthe authority of the Executive Board on 31 October1977 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference MEE/4 Draft for comment 75/76178 DC ISBN 0 580 09537 1 Cooperating organizations The Mechanical Engineering
3、 Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and professional and industrial organizations: The organizations marked with an asterisk in the above list, together with the following, were directly
4、 represented on the committee entrusted with the preparation of this British Standard: Associated Offices Technical Committees Health and Safety Executive HM Association of Consulting Engineers Factory Inspectorate Association of Hydraulic Equipment Institution of Civil Engineers Manufacturers Ltd.
5、Institution of Gas Engineers Association of Mining Electrical and Institution of Heating and Ventilating Mechanical Engineers Engineers British Compressed Air Society Institution of Mechanical Engineers British Electrical and Allied Institution of Plant Engineers Manufacturers Association Institutio
6、n of Production Engineers British Gas Corporation London Transport Executive British Gear Manufacturers Association Machine Tool Trades Association British Internal Combustion Engine Ministry of Defence* Manufacturers Association Ministry of Defence, Army Department British Mechanical Engineering Na
7、tional Coal Board Confederation National Engineering British Pump Manufacturers Association Laboratory Department of Trade British Steel Corporation Process Plan Association British Steel Industry Railway Industry Association of Crown Agents for Oversea Governments Great Britain* and Administration
8、Royal Institute of British Architects Department of the Environment Society of Motor Manufacturers Department of Trade and Traders Electricity Supply Industry in England Telecommunication Engineering and and Wales Manufacturing Association Engineering Equipment Users Association The Water-tube Boile
9、rmakers Association Federation of Manufacturers of Construction Equipment and Cranes Department of Industry, National Milling Cutter and Reamer Association Engineering Laboratory Steel Works Plant Association Institution of Engineers and Shipbuilders in Scotland Amendments issued since publication A
10、md. No. Date of issue CommentsBS4235-2:1977 BSI 07-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 Field of application 1 3 Dimensions and tolerances of keys 1 4 Material 1 5 Shape, dimensions and tolerances of keyways 1 6 Relationship of shaft diameter to k
11、ey size 1 7 Designation 1 Table 1 Dimensions and tolerances of keys 2 Table 2 Dimensions and tolerances of keyways 3 Table 3 Relationship: shaft diameter key size 4BS4235-2:1977 ii BSI 07-1999 Foreword This Part of this British Standard has been prepared under the direction of the Mechanical Enginee
12、ring Standards Committee. It is identical with ISO3912 “Woodruff keys and keyways”. Terminology and conventions. The text of the international standard has been accepted as suitable for publication, without deviation, as a British Standard. Certain terminology and conventions are used, however, that
13、 are not identical with those used in British Standards. Attention is therefore drawn to the following. Wherever the words “International Standard”, relating to this publication, appear, they should be interpreted as “British Standard”. The comma has been used throughout as a decimal marker. In Brit
14、ish Standards it is current practice to use a full point (a full stop on the baseline) as the decimal marker. 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
15、 Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to4 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be in
16、dicated in the amendment table on the inside front cover.BS4235-2:1977 BSI 07-1999 1 1 Scope This International Standard specifies the dimensional characteristics of Woodruff keys and of the alternative Whitney key and of the corresponding keyways in shaft and hub. It also gives the relationship to
17、be observed between the diameter of the shaft and the section of the key for both torque transmission and positional applications. 2 Field of application This International Standard is intended for general application to cylindrical shafts and cylindrical shaft ends. 1) 3 Dimensions and tolerances o
18、f keys See the figures and Table 1 on page2. 4 Material Steel having a tensile strength of not less than590N/mm 2in the finished condition, unless otherwise agreed between the interested parties. NOTEThe mechanical properties of the steel will be specified completely at a later date. 5 Shape, dimens
19、ions and tolerances of keyways See the figure and Table 2 on page3. 6 Relationship of shaft diameter to key size Two series of relationships between shaft diameter and key size are given in Table 3, page4: series1 for torque applications and series2 for positional applications (for example where, as
20、 in the case of an interference fit, the torque is not transmitted through the key but through the shaft/hub interface). 7 Designation A woodruff key shall be designated by its width and its height and by reference to this International Standard. Examples For a key of normal form and with a section
21、b h 1 =5 6,5mm: Key ISO39125 6,5 For a key of Whitney form and with a section b h 2 =5 5,2mm: Key ISO39125 5,2 1) The relationship between the diameter of a conical shaft end and the key section is given in ISO. (in preparation).BS4235-2:1977 2 BSI 07-1999 Table 1 Dimensions and tolerances of keys V
22、alues in millimetres Width b Height h 1 Diameter D Chamfer s nominal tolerance h9 a nominal tolerance h11 nominal tolerance h12 min. max. 1,0 1,4 4 0,16 0,25 1,5 2,6 7 0,16 0,25 2,0 2,6 7 0,16 0,25 2,0 3,7 10 0,16 0,25 2,5 3,7 10 0,16 0,25 3,0 5,0 13 0,16 0,25 3,0 6,5 16 0,16 0,25 4,0 6,5 16 0,25 0,
23、40 4,0 7,5 19 0,25 0,40 5,0 6,5 16 0,25 0,40 5,0 7,5 19 0,25 0,40 5,0 9,0 22 0,25 0,40 6,0 9,0 22 0,25 0,40 6,0 10,0 25 0,25 0,40 8,0 11,0 28 0,40 0,60 10,0 13,0 32 0,40 0,60 a A closer tolerance may be adopted subject to agreement between the interested parties. 1)This form should only be adopted b
24、y agreement between the interested parties. 2) In this case the height h 2of the key shall be equal to0,8 times the height of the Woodruff key of normal form, i.e.h 2 =0,8 h 1 . The calculated value shall be rounded off to the nearest0,1mm. 0 0,025 0 0,060 0 0,120 0 0,150 0 0,075 0 0,180 0 0,090 0 0
25、,210 0 0,030 0 0,180 0 0,210 0 0,036 0 0,110 0 0,250BS4235-2:1977 BSI 07-1999 3 Table 2 Dimensions and tolerances of keyways Values in millimetres Key size of normal form b h 1 D or equivalent Whitney form Width b Depth Radius R nominal Tolerance Shaft t 1 Hub t 2 Normal fit Close fit Shaft N9 Hub J
26、 s 9 Shaft and hub P9 nominal tolerance nominal tolerance max. min. 1,0 1,4 4 1,0 0,004 0,029 +0,012 0,012 0,006 0,031 1,0 0,6 0,16 0,08 1,5 2,6 7 1,5 2,0 0,8 0,16 0,08 2,0 2,6 7 2,0 1,8 1,0 0,16 0,08 2,0 3,7 10 2,0 2,9 1,0 0,16 0,08 2,5 3,7 10 2,5 2,7 1,2 0,16 0,08 3,0 5,0 13 3,0 3,8 1,4 0,16 0,08
27、3,0 6,5 16 3,0 5,3 1,4 0,16 0,08 4,0 6,5 16 4,0 +0,015 0,015 0,012 0,042 5,0 1,8 0,25 0,16 4,0 7,5 19 4,0 6,0 1,8 0,25 0,16 5,0 6,5 16 5,0 4,5 2,3 0,25 0,16 5,0 7,5 19 5,0 5,5 2,3 0,25 0,16 5,0 9,0 22 5,0 7,0 2,3 0,25 0,16 6,0 9,0 22 6,0 6,5 2,8 0,25 0,16 6,0 10,0 25 6,0 7,5 2,8 0,25 0,16 8,0 11,0 2
28、8 8,0 +0,018 0,018 0,015 0,051 8,0 3,3 0,40 0,25 10,0 13,0 32,0 10,0 10,0 3,3 0,40 0,250 01 , +0 01 , +0 02 , + 0 0030 , 0 03 , +0 02 , + 0 0036 , BS4235-2:1977 4 BSI 07-1999 Table 3 Relationship: shaft diameter key size Dimensions in millimetres Shaft diameter d Key size of normal form b h 1 D or e
29、quivalent Whitney form Series1 Series2 Over Including Over Including 3 4 3 4 1,0 1,4 4 4 5 4 6 1,5 2,6 7 5 6 6 8 2,0 2,6 7 6 7 8 10 2,0 3,7 10 7 8 10 12 2,5 3,7 10 8 10 12 15 3,0 5,0 13 10 12 15 18 3,0 6,5 16 12 14 18 20 4,0 6,5 16 14 16 20 22 4,0 7,5 19 16 18 22 25 5,0 6,5 16 18 20 25 28 5,0 7,5 19
30、 20 22 28 32 5,0 9,0 22 22 25 32 36 6,0 9,0 22 25 28 36 40 6,0 10,0 25 28 32 40 8,0 11,0 28 32 38 10,0 13,0 32blankBS4235-2: 1977 ISO3912:1977 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It p
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