1、BRITISH STANDARD BS 1804-2: 1968 Incorporating Amendment No. 1 Specification for Parallel steel Dowelpins Part 2: Metric SeriesBS1804-2:1968 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee and endorsed by the Chairman ofthe Engineering Divisional
2、Council, was published undertheauthority of the GeneralCouncilon 26 September 1968 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference MEE/117 Draft for comment 67/24646 ISBN 580 00311 6 Co-operating organizations The Mechanical Engineering Industry Stan
3、dards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: The Government departments and scientific and industrial organizations marked with an asterisk in the above
4、list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Associated Offices Technical Committee Institution of Gas Engineers Association of Consulting Engineers Institution of Heating and Ventilating Association of Mining
5、Electrical and Engineers Mechanical Engineers Institution of Mechanical Engineers* Board of Trade Institution of Mechanical Engineers British Chemical Plant Manufacturers (Automobile Division) Association Institution of Production Engineers British Compressed Air Society Locomotive and Allied Manufa
6、cturers British Electrical and Allied Manufacturers Association of Great Britain Association London Transport Board British Gear Manufacturers Association Machine Tool Trades Association* British Internal Combustion Engine Ministry of Defence Manufacturers Association Ministry of Defence, Army Depar
7、tment British Steel Industry Ministry of Labour (H.M. Factory Inspectorate) British Mechanical Engineering Federation Ministry of Power British Pump Manufacturers Association Ministry of Public Building and Works Crown Agents for Oversea Governments and Ministry of Technology Administrations Ministr
8、y of TechnologyNational Engineering Electricity Council, the Central Electricity Laboratory Generating Board and the Area Boards National Physical Laboratory (Ministry of in England and Wales Technology) Engineering Equipment Users Association Ministry of Transport Gas Council National Coal Board In
9、stitute of Marine Engineers Radio Industry Council Institution of Civil Engineers Royal Institute of British Architects British Plastics Federation Individual manufacturer Taper Pin Manufacturers Association Amendments issued since publication Amd. No. Date Comments 8359 March 1995 Indicated by a si
10、deline in the marginBS1804-2:1968 BSI 07-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Material 1 4 Hardness 1 5 Dowel pins in blind holes 1 6 Dimensions 1 7 Limits of tolerance on dimensions 1 8 Surface texture 2 9 Dowel pin ends 2 10 Ant
11、i-corrosion treatment 2 11 Marking 2 12 Ordering 3 Appendix A Fitting dowel pins into blind holes 4 Figure 1 Method for releasing trapped air 4 Table 1 Limits of tolerance on diameter 2 Table 2 Dimensions of parallel steel dowel pins 3BS1804-2:1968 ii BSI 07-1999 Foreword This standard makes referen
12、ce to the following British Standards: BS 427, Method for Vickers hardness test Part 1: Testing of metals. BS 860, Table for comparison of hardness scales. BS 970, Wrought steels in the form of bars, billets, and forgings, up to 6in ruling section, for automobile and general engineering purposes. En
13、 series. BS 1133, Packaging code. Section 6. Temporary protection of metal surfaces against corrosion (during transport and storage). BS 1134, 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
14、 steel (precision finish). BS 1916, Limits and fits for engineering. Obsolescent (by Amendment No. 1) The need for the pins covered by this British Standard has been reviewed and it has been decided that, in the interests of rationalization, they should be regarded as obsolescent. Their use for new
15、designs is not therefore recommended. The standard will be withdrawn in due course. NOTEEven though this standard has largely been superseded by BSEN28734:1992 and BSEN22338:1992, it has not been withdrawn but declared obsolescent as it is recognized that it should remain available for the servicing
16、 of existing designs which are expected to have a long working life. This Part 2 or BS1804 has been published under the authority of the Mechanical Engineering Industry Standards Committee, and forms a companion volume to Part 1, inch series. An attempt has been made to set out a range of metric sto
17、ck sizes that will satisfy European demands. These sizes are jointly based upon those given in the equivalent Austrian and ISO proposal documents. It is recognized that the cylindrical surface of precision ground parallel dowel pins sometimes has a functional duty necessitating numerical control of
18、surface texture. In order to avoid confusion about the meanings of the various terms used to describe “dowel pins”, the terms “precision ground parallel dowel pin”, “ground parallel dowel pin” and “parallel dowel pin” have been defined in this standard. Dowel pins are normally used to locate two or
19、more components to a required degree of accuracy. In order to provide for varying degrees of accuracy three grades have been standardized. Attention is specially called to the danger which may arise when fitting dowel pins into blind holes. A suggestion for preventing this danger is made in an appen
20、dix. 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 document compr
21、ises a front cover, an inside front cover, pagesi andii, pages1 to4, 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.BS1804-2:1968 BSI 07-1999
22、1 1 Scope This British Standard specifies requirements for cylindrical parallel steel dowel pins used normally for the accurate location of components relative to each other. Three grades are included: Grade 1. Precision ground parallel dowel pins. Grade 2. Ground parallel dowel pins. Grade 3. Paral
23、lel dowel pins. 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 in2.2, 2.3 and2.4 2.2 precision ground parallel dowel pin a Grade 1 steel dowel pin having a ground
24、 finish, and conforming to the total diametral tolerance given inTable 1 2.3 ground parallel dowel pin a Grade 2 steel dowel pin having a ground finish and conforming to the total diametral tolerance given inTable 1 2.4 parallel dowel pin a Grade 3 steel dowel pin having a machined, bright rolled or
25、 drawn finish, and conforming to the total diametral tolerance given inTable 1 3 Material Dowel pins shall be manufactured from steels as follows. 3.1 Grade 1 and 2 steel dowel pins shall be manufactured from En32A or En32B low carbon steel conforming to BS970 1) , or from high carbon steel conformi
26、ng to either BS1407 2)or BS1423 3) . 3.2 Grade 3 steel dowel pins shall be manufactured from En1A free cutting steel conforming to BS970 1) . By arrangement between the purchaser and the manufacturer, other steels conforming to BS970 1)may be used as alternatives to those given above. 4 Hardness The
27、 dowel pins shall be supplied in accordance with the following requirements. 4.1 Grade 1 steel dowel pins. Dowel pins manufactured from steel to BS970 1)En 32A and B shall conform to the following requirements for hardness: below4mm diameter: unhardened; 4mm diameter and above: hardened to a minimum
28、 of750HV30 BS427 4) . Dowel pins manufactured from steels conforming to BS1407 2)and BS1423 3)shall have a hardness within the range600HV to700HV30 BS427 4) . The values on other hardness scales may be used in accordance with BS860 5) . 4.2 Grades 2 and 3 steel dowel pins. The dowel pins shall be su
29、pplied in the unhardened condition except when otherwise agreed between the purchaser and the manufacturer. 4.3 Alternative steels. When steels other than the standard range are used (see Clause3) the hardness shall be as agreed between the purchaser and the manufacturer. 5 Dowel pins in blind holes
30、 In the case of dowel pins having an interference fit and intended for application to “blind” holes, it is important that provision should be made for the release of air (seeAppendix A). The purchaser should state if this feature is required. 6 Dimensions The range of diameters and lengths in which
31、the various grades of dowel pins shall be available as standard are given inTable 2. 7 Limits of tolerance on dimensions Limits of tolerance shall be in accordance with the following requirements. 7.1 Diameter. The limits of diametral tolerance for dowel pins shall conform to the values given inTabl
32、e 1 (abstract BS1916 6) ). 1) BS970, “Wrought steels. En series”. 2) BS1407, “High carbon bright steel (silver steel)”. 3) BS1423, “High carbon oil-hardening steel (precision finish)”. 4) BS427, “Method for Vickers hardness test”, Part 1 “Testing of metals”. 5) BS860, “Table for comparison of hardne
33、ss scales”. 6) BS1916, “Limits and fits for engineering”.BS1804-2:1968 2 BSI 07-1999 Table 1 Limits of tolerance on diameter 7.2 Length. The limits of tolerance on the overall length of all grades of dowel pins are given below: 8 Surface texture When assessed in accordance with BS1134 7) , the rough
34、ness of the cylindrical surface of Grades1 and2 steel dowel pins shall be not greater than0.4m C.L.A. (16 C.L.A.). 9 Dowel pin ends Each dowel pin shall have a circumferential chamfer of20 to40 on one end, for the purpose of providing a lead; the chamfer shall be visible all round the circumference.
35、 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 value a max,shown inTable 2. 10 Anti-corrosion treatment The dowel pins shall be given suitable anti-corrosion treatment in accordance with BS1133, S
36、ection6 8) . 11 Marking Each package or lot of dowel pins shall bear the manufacturers name or trade mark, the number of this British Standard and the grade of dowel pin, e.g. BS1804-2, Grade2. NOTEThe mark BS1804-2 on or in relation to the product is a claim by the manufacturer that it complies wit
37、h the requirements of the standard. The British Standards Institution is the owner of 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 b
38、y the BSI. The presence of this mark on or in relation to a product is an assurance 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 manu
39、facturers works in accordance with the certification mark scheme of the BSI. Further particulars of the terms of licence may be obtained from the Director, British Standards Institution, 2 Park Street, London W.1. Tolerance unit = 0.001 mm Grade 1 2 3 Tolerance zone m5 h7 h11 Nominal diameters mm Ov
40、er To High + Low + High + Low High + Low 3 7 2 0 12 a 0 60 3 6 9 4 0 12 0 75 6 10 12 6 0 15 0 90 10 14 15 7 0 18 0 110 14 18 18 24 17 8 0 21 0 130 24 30 NOTEThe tolerances of Grade 1 and 2 steel dowel pins have been chosen so that, when used in standard reamed holes (H7andH8tolerance zone), they sho
41、uld function satisfactorily. If not satisfactory, BS1916, Part 1, “Limits and tolerances”, should be consulted, and a different class of fit chosen. a This tolerance is larger than given in BS1916, and has been included because a tighter tolerance would involve precision grindingby the manufacturer
42、which is uneconomic for a Grade2 steel dowel pin. Length Tolerance Up to 50 mm + 0.5 mm 0.0mm Over50mm +0.8mm 0.0mm 7) BS 1134, “Centre-line average height method for the assessment of surface texture”. 8) BS 1133, “Packaging code, Section 6, “Temporary prevention of corrosion of metal surfaces (dur
43、ing transport and storage)”.BS1804-2:1968 BSI 07-1999 3 12 Ordering When ordering dowel pins the customer should specify: grade (see Clause1); nominal diameter (seeTable 2); nominal length (seeTable 2); whether provision for air release is required (seeClause5). Table 2 Dimensions of parallel steel
44、dowel pins Nominal diameters D 1 1.5 2 2.5 3 4 5 6 8 10 12 16 20 25 a max. 0.3 0.3 0.3 0.4 0.45 0.6 0.75 0.9 1.2 1.5 1.8 2.5 3 4 Nominal length L 4 0 0 6 0 0 0 0 8 0 0 0 0 0 10 0 0 0 0 0 12 0 0 0 0 0 0 16 0 0 0 0 0 0 0 20 0 0 0 0 0 0 0 25 0 0 0 0 0 0 0 30 0 0 0 0 0 0 0 35 0 0 0 0 0 0 40 0 0 0 0 0 0
45、0 45 0 0 0 0 0 0 50 0 0 0 0 0 0 60 0 0 0 0 0 0 70 0 0 0 0 0 80 0 0 0 0 0 90 0 0 0 0 100 0 0 0 110 0 0 0 120 0 0BS1804-2:1968 4 BSI 07-1999 Appendix A Fitting dowelpinsinto blind holes Damage to costly material, apart from danger to personnel, frequently results from attempts to drive dowel pins into
46、 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 inFigure 1. Figure 1 Method for releasing trapped airBS1804-2
47、:1968 BSI 07-1999 British Standards The following are available on application: YEARBOOK Including subject index and numerical list of British Standards SECTIONAL LISTS. Gratis Acoustics (SL10) Aerospace materials and components (SL25) Automobile (SL34) British Standard Handbooks (SL27) Building (SL
48、16) Chemical engineering (SL5) Chemicals, fats, glues, oils, soap, etc. (SL4) Cinematography and photography (SL1) Coal, coke and colliery requisites (SL13) Codes of Practice (SL8) Consumer goods (SL3) Documentation, including Universal Decimal Classification (SL35) Drawing practice (SL37) Electrica
49、l engineering (SL26) Farming, dairying and allied interests (SL31) Furniture, bedding and furnishings (SL11) Gardening, horticulture and landscape work (SL41) Gas and solid fuel and refractories (SL 2) Glassware, excluding laboratory apparatus (SL39) Heating, ventilating and air conditioning (SL42) Hospital equipment (SL18) Illumination and lighting fittings (SL14) Industrial instruments, etc. (SL17) Iron and steel (SL24) Laboratory apparatus (SL23) Leather, plastics, rubber (SL12) Local authority purchasing officers guide (SL28) Machin
