《BS 1804-1-1966.pdf》由会员分享,可在线阅读,更多相关《BS 1804-1-1966.pdf(12页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 1804-1: 1966 Incorporating Amendment No. 2 Specification for Parallel steel dowel pins Part 1: Inch Series UDC 621.886:389.152 BS 1804-1:1966 This British Standard, having been approved by the Mechanical Engineering Industry Standards Committee and endorsed by the Chairman of the
2、 Engineering Divisional Council, was published under the authority of the General Council on 26th August, 1966 BSI 07-1999 First published, November, 1951 First revision, published as Part 1, August, 1966 The following BSI references relate to the work on this standard: Committee reference MEE/117 D
3、raft for comment D64/1572 ISBN 0 580 35084 3 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizatio
4、ns: Associated Offices Technical CommitteeInstitution of Heating and Ventilating Association of Consulting EngineersEngineers Association of Mining Electrical and Institution of Mechanical Engineers* Mechanical EngineersInstitution of Mechanical Engineers Board of Trade(Automobile Division) British
5、Chemical Plant Manufacturers Institution of Production Engineers AssociationLocomotive and Allied Manufacturers British Compressed Air SocietyAssociation of Great Britain British Electrical and Allied Manufacturers London Transport Board AssociationMachine Tool Trades Association British Gear Manufa
6、cturers AssociationMinistry of Defence, Army Department British Internal Combustion Engine Ministry of Defence, Navy Department Manufacturers AssociationMinistry of Labour (H.M. Factory Inspectorate) British Iron and Steel FederationMinistry of Power British Mechanical Engineering FederationMinistry
7、 of Public Building and Works Crown Agents for Oversea Governments and Ministry of Technology National AdministrationsEngineering Laboratory Electricity Council, the Generating Board and Ministry of Transport the Area Boards in England and WalesNational Coal Board Engineering Equipment Users Associa
8、tionNational Physical Laboratory (Ministry of Gas CouncilTechnology) Institute of Marine EngineersRadio Industry Council Institution of Civil EngineersRoyal Institute of British Architects Institution of Gas Engineers The industrial organization marked with an asterisk in the above list, together wi
9、th the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Plastics FederationTaper Pin Manufacturers Association Gauge and Toolmakers AssociationIndividual manufacturers Society of British Aerospace Companies Ltd. Amendments issued
10、since publication Amd. No.DateComments 96September 1968 4124November 1982 Indicated by a sideline in the margin BS 1804-1:1966 BSI 07-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2Definitions1 3Material1 4Hardness1 5Dowel pins in blind holes2 6Dimensions2 7Limi
11、ts of tolerance on dimensions2 8Surface texture2 9Chamfer2 10Anti-corrosion treatment3 11Marking3 Appendix A Fitting dowel pins into blind holes6 Appendix B Tables for conversion of inches to approximate millimetre equivalents6 Figure 1 Method for releasing trapped air6 Table 1 Limits of tolerance o
12、n diameter2 Table 2 Limits of tolerance on length2 Table 3 Dimensions of parallel steel dowel pins4 BS 1804-1:1966 ii BSI 07-1999 Foreword This standard makes reference to the following British Standards: BS 427, Method for Vickers hardness test Part 1: Testing of metals. BS 860, Table of approximat
13、e comparison of hardness scales. BS 970, Wrought steels in the form of bars, billets and forgings, up to 6 in ruling section for automobile and general engineering purposes. En series. BS 1133, Packaging code Section 6: Temporary prevention of corrosion (during transportation and storage). BS 1134,
14、Centre-line-average-height method for the assessment of surface texture. BS 1407, High carbon bright steel (silver steel). BS 1423, High carbon oil-hardening steel (precision finish). This British Standard, which was first published in 1951, has been revised under the authority of the Mechanical Eng
15、ineering Industry Standards Committee. Changes have been made to the range of stock sizes in order to correspond with present-day demands. Also, recognizing that the precision ground parallel dowel pins are sometimes used in applications where the cylindrical surface of the pin has a functional duty
16、, surface texture is subjected to numerical control, thus bringing considerably closer definition to the term “precision ground”. The term “dowel pin”, though widely used throughout industry has, so far, had no common meaning. Not only has the use of the term varied with industries but sometimes in
17、the same industry its use has varied with the locality. On the one hand different terms have been used for pins of the same type, while on the other the same term has been applied to pins of differing types. For these reasons distinctions have been drawn by defining “precision ground parallel dowel
18、pin” and “ground parallel dowel pin”. Dowel pins are normally used to locate two or more components to a required degree of accuracy. In order to provide for varying degrees of accuracy four grades have been standardized. Attention is specially called to the danger which may arise when fitting dowel
19、 pins into blind holes. A suggestion for preventing this danger is made in an appendix. Part 2 of this standard deals with metric series parallel steel dowel pins. Obsolescent (by Amendment No. 2). The need for the product covered by this British Standard has been reviewed and it has been decided th
20、at, in the interests of rationalization, it should be regarded as obsolescent and not therefore used for new designs. The standard will be withdrawn in due course. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible fo
21、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, pages 1 to 7 and a back cover. This standard has been updated (see copyright date)
22、 and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. BS 1804-1:1966 BSI 07-19991 1 Scope This British Standard relates to cylindrical parallel steel dowel pins used normally for the accurate location of components relative to each other.
23、 Four grades are included: 2 Definitions For the purposes of this British Standard, the following definitions apply: 2.1 dowel pin the generic term which refers to all types of parallel locating pins, as defined in 2.2, 2.3 and 2.4 2.2 precision ground parallel dowel pin a Grade I steel dowel pin ha
24、ving a ground finish and a total diametral tolerance of 0.000 2 inch 2.3 ground parallel dowel pin a Grade II steel dowel pin having a ground finish and a total diametral tolerance of 0.000 5 inch 2.4 parallel dowel pin a Grade III or Grade IV steel dowel pin having a machined, bright rolled or draw
25、n finish, and a total diametral tolerance wider than that specified for Grades I and II 3 Material Dowel pins shall be manufactured from steels as follows: 3.1 Grades I and II steel dowel pins. From low carbon steel having an analysis conforming to BS 9701) En 32 A or En 32 B, or from high carbon st
26、eel conforming to either BS 14072) or BS 14233). 3.2 Grades III and IV steel dowel pins. From free-cutting steel conforming to BS 9701) En 1 A. By arrangement between purchaser and manufacturer, other steels conforming to BS 9701) may be used as alternatives to those given above. 4 Hardness The dowe
27、l pins shall be supplied in accordance with the following requirements: 4.1 Grade I steel dowel pins: Dowel pins manufactured from steel to BS 9701) En 32 A and B shall conform to the following requirements for hardness: below 1/8 in diameter: unhardened; 1/8 in diameter and above: hardened to a min
28、imum of 750 HV 30 (BS 4274). Dowel pins manufactured from steels conforming to BS 14072) and BS 14233) shall have a hardness within the range 600 to 700 HV 30 (BS 4274). The values on other hardness scales may be used in accordance with BS 8605). 4.2 Grades II, III and IV steel dowel pins. The dowel
29、 pins shall be supplied in the unhardened condition except when otherwise agreed between purchaser and manufacturer. Grade IPrecision ground parallel dowel pins; Grade IIGround parallel dowel pins; Grades III and IV Parallel dowel pins with progressively wider limits of tolerance. 1) BS 970, “Wrough
30、t steels. En series”. 2) BS 1407, “High carbon bright steel (silver steel)”. 3) BS 1423, “High carbon oil-hardening steel (precision finish)”. 4) BS 427, “Method for Vickers hardness test”, Part 1, “Testing of metals”. 5) BS 860, “Table of approximate comparison of hardness scales”. BS 1804-1:1966 2
31、 BSI 07-1999 4.3 Alternative steels. When steels other than the standard range are used (see Clause 3) the hardness shall be as agreed between purchaser and manufacturer. 5 Dowel pins in blind holes In the case of dowel pins having an interference fit and intended for application to “blind” holes, i
32、t is important that provision should be made for the release of air (see Appendix A). The purchaser should state if this feature is required. 6 Dimensions The range of diameters and lengths in which the various grades of dowel pins shall be available as standard are given in Table 3. 7 Limits of tol
33、erance on dimensions Limits of tolerance shall be in accordance with the following requirements: 7.1 Diameter. The total tolerance on the diameter shall vary with the pin and shall be as given in Table 1. Table 1 Limits of tolerance on diameter 7.2 Length. The limits of tolerance on the overall leng
34、th of all grades of dowel pins shall be as given in Table 2. Table 2 Limits of tolerance on length 8 Surface texture When assessed in accordance with BS 11346), the roughness of the cylindrical surface of Grades I and II steel dowel pins shall be not greater than 16 CLA. 9 Chamfer Each pin shall hav
35、e a circumferential chamfer of 20 to 40 on one end, for the purpose of providing a lead; the chamfer shall be visible all round the circumference. The other end may be similarly chamfered or alternatively domed at the discretion of the manufacturer. The depth of the chamfer shall comply with the pro
36、visions of Table 3, Column 67). GradeTotal toleranceDisposition of tolerance inin I0.000 2+ 0.000 1 to + 0.000 3 II0.000 5+ 0.000 25 to 0.000 25 III0.001+ 0.000 5 to 0.000 5 IV (for pins up to and including 5/8 in diameter)0.002Nominal diameter 0.002 IV (for pins above 5/8 in diameter)0.003Nominal d
37、iameter 0.003 Nominal overall length of pin, L Limits of tolerance inin Up to and including 2 Nominal length L 0.020 Over 2Nominal length L 0.030 6) BS 1134, “Centre-line average height method for the assessment of surface texture”. 7) BS 1133, “Packaging code”, Section 6, “Temporary prevention of c
38、orrosion of metal surfaces (during transportation and storage).” BS 1804-1:1966 BSI 07-19993 10 Anti-corrosion treatment The dowel pins shall be given suitable anti-corrosion treatment in accordance with BS 1133, Section 67). 11 Marking Each package or lot of dowel pins shall bear the manufacturers
39、name or trade mark, the number of this British Standard and the grade of dowel pin, e.g. BS 1804-1, Grade I. NOTEThe mark BS 1804-1 on or in relation to the product is a claim by the manufacturer that it complies with the requirements of the standard. The British Standards Institution is the owner o
40、f a registered certification trade mark. This is shown below, enclosed in the words, “Approved to British Standard”. This mark can be used only by manufacturers licensed under the certification mark scheme operated by the BSI. The presence of this mark on or in relation to a product is an assurance
41、that the goods have been produced to comply with the requirements of the British Standard under a system of supervision, control and testing operated during manufacture and including periodical inspection at the manufacturers works in accordance with the certification mark scheme of the BSI. BS 1804
42、-1:1966 4 BSI 07-1999 Table 3 Dimensions of parallel steel dowel pins 1234567 Nom. dia. D Grade Actual diameterNominal length L Depth of chamfer. C Max. Grade Minimum Maximum 1/43/81/25/83/47/8 111/811/413/811/213/4221/421/223/4331/24 1/16 I0.062 60.062 8000I II0.020II IIIIII IVIV 1/8 I0.125 10.125
43、30000000000I II0.124 75 0.125 2500000000000.020II IIIIII IVIV 3/16 I0.187 60.187 8000000000000I III0.187 25 0.187 750000000000000.030II IIIIII IVIV 1/4 I0.250 10.250 3000000000000I II0.249 75 0.250 250000000000000.030II III0.249 50.250 5000000000III IV0.248 00.250 0000000000IV BS 1804-1:1966 BSI 07-
44、19995 Table 3 Dimensions of parallel steel dowel pins 1234567 Nom. dia. D Grade Actual diameter Nominal length L Depth of chamfer. C Max. Grade MinimumMaximum 1/43/81/25/83/47/8 111/811/413/811/213/4221/421/223/4331/2 4 5/16 I0.312 60.312 8000000000000000I II0.312 250.312 750000000000000000.040II II
45、I0.312 00.313 000000000000III IV0.310 50.312 500000000000IV 3/8 I0.375 10.375 30000000000000000I II0.374 750.375 2500000000000000000.040II III0.374 50.375 5000000000000III IV0.373 00.375 0000000000000IV 7/16 I0.437 60.437 80000000000000I II0.437 250.437 7500000000000000.040II III0.437 00.438 0000000
46、000000III IV0.435 50.437 5000000000000IV 1/2 I0.500 10.500 30000000000000I II0.499 750.500 2500000000000000.040II III0.499 50.500 5000000000000III IV0.498 00.500 0000000000000IV 5/8 I0.625 10.625 30000000I II0.624 750.625 2500000000.060II III0.624 50.625 500000000000III IV0.623 00.625 000000000000IV
47、 3/4 I0.750 10.750 30000000I II0.749 750.750 2500000000.060II III0.749 50.750 500000000000III IV0.747 00.750 000000000000IV 7/8 I0.875 10.875 30000000I II0.874 750.875 2500000000.060II III0.874 50.875 50000000000III IV0.872 00.875 00000000000IV 1 I1.000 11.000 300000I II0.999 751.000 25000000.060II
48、III0.999 51.000 500000000III IV0.997 01.000 000000000IV Nominal length L 1/43/81/25/83/47/8 111/811/413/811/213/4221/421/223/4321/24 BS 1804-1:1966 6 BSI 07-1999 Appendix A Fitting dowel pins into blind holes Damage to costly material, apart from danger to personnel, frequently results from attempts
49、 to drive dowel pins into blind holes without first making provision for the release of trapped air. Unless precautions are taken, severe stresses tending to burst the component may be set up. A typical method used for ensuring the release of the air is indicated in Figure 1. Appendix B Tables for conversion of inches to approximate millimetre equivalents Example: Find 35/8 inches in millimetres: 3 inches = 76.2 millimetres; 5/8 inch = 15.9 millimetres. Hence 76.2 + 15.9 = 92.1 millimetres = 35/8 inches. Figure 1 Method for
链接地址:https://www.31doc.com/p-3730484.html