1、BRITISH STANDARD BS1804-3: 1973 Incorporating Amendment Nos.1 and2 Specification for Steel dowel pins Part3: Parallel and taper types having screw threads for extraction purposes. Metric series UDC 621.882.219.4BS1804-3:1973 This British Standard, having been approved by the MechanicalEngineering In
2、dustryStandards Committee,was published underthe authority ofthe Executive Board on 15 May1973 BSI06-1999 The following BSI references relate to the work on this standard: Committee reference MEE/60/5 Draft for comment69/8772 ISBN 0 580 07933 3 Co-operating organizations The Mechanical Engineering I
3、ndustry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: The industrial organization marked with an asterisk in the above list, together with the followi
4、ng, were directly represented on the committee entrusted with the preparation of this British Standard. Associated Offices Technical Committee Engineering Equipment Users Association Association of Consulting Engineers Gas Council Association of Hydraulic Equipment Institution of Civil Engineers Man
5、ufacturers Ltd 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 Manufacturers Institution of Mechanical Engineers As
6、sociation (Automobile Division) British Gear Manufacturers Association Institution of Plant Engineers British Internal Combustion Engine Institution of Production Engineers Manufacturers Association* London Transport Executive British Mechanical Engineering Confederation Machine Tool Trades Associat
7、ion British Pump Manufacturers Association Ministry of Defence British Steel Corporation Ministry of Defence, Army Department British Steel Industry National Coal Board Crown Agents for Oversea Governments and National Physical Laboratory (Department of Administrations Trade and Industry) Department
8、 of Employment Process Plant Association Department of the Environment Railway Industry Association of Great Britain Department of Trade and Industry Royal Institute of British Architects Department of Trade and Industry National Telecommunications Engineering Engineering Laboratory Manufacturing As
9、sociation Electricity Council, the Central Electricity Generating Board and the Area Boards in England and Wales Cotter Pin Association Society of Motor Manufacturers and Traders Institute of Iron and Steel Wire Manufacturers Amendments issued since publication Amd. No. Date of issue Comments 4307 N
10、ovember1983 8360 November1994 Indicated by a sideline in the marginBS1804-3:1973 BSI 06-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Materials 1 4 Hardness 1 5 Dowel pins in blind holes 1 6 Dimensions 1 7 Surface texture 1 8 Anti-corrosio
11、n treatment 1 9 Designation 1 10 Marking 2 11 Inspection 2 12 Information to be supplied by the purchaser 2 Appendix A Fitting dowel pins into blind holes 3 Figure 1 Type A dowel pin with air release flat 3 Figure 2 Type B dowel pin with air release flat 3 Table 1 Dimensions of type A parallel dowel
12、 pins with external thread 4 Table 2 Dimensions of type B parallel dowel pins with internal thread 5 Table 3 Dimension of type C taper dowel pins with external thread 6 Table 4 Dimensions of type D taper dowel pins with internal thread 7 Publications referred to 8BS1804-3:1973 ii BSI 06-1999 Forewor
13、d Obsolescent (by Amendment No. 2) The need for the pins covered by this British Standard has been reviewed and it as been decided that, in the interests of rationalization, they should be regarded as obsolescent. Their use for new designs is not therefore recommended. The standard will be withdrawn
14、 in due course. This part of this British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee and is intended to form a companion volume to Parts1 and2 of BS1804, both of which have already been published. In order to avoid confusion about the me
15、aning of the word dowel pin, the term “precision ground dowel pin” has been defined. Dowel pins are normally used to locate two or more components to a required degree of accuracy, and only one grade has been standardized. Attention is called specially to the danger which may arise when fitting para
16、llel dowel pins into blind holes. A suggestion for preventing this danger is made in the appendix. 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 d
17、oes not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This
18、 will be indicated in the amendment table on the inside front cover.BS1804-3:1973 BSI 06-1999 1 1 Scope This British Standard specifies requirements for cylindrical parallel and taper steel dowel pins, having either external or internal threads for extraction purposes. The dowel pins are generally i
19、ntended for use where accurate location of components relative to each other is required. Only one grade of accuracy is provided as follows: Grade 1. Precision ground parallel and taper dowel pins. The following types of dowel pin are included. Type A. Parallel dowel pin with external thread Type B.
20、 Parallel dowel pin with internal thread Type C. Taper dowel pin with external thread Type D. Taper dowel pin with internal thread NOTEThe titles of the British Standards referred to in this Standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard, the fo
21、llowing definitions apply. 2.1 dowel pin the generic term which refers to the types of locating pins as defined in2.2 and2.3 below 2.2 precision ground parallel dowel pin a grade 1 steel dowel pin having a ground finish and conforming to the total diametrical tolerance given in Table 1 and Table 2 2
22、.3 precision ground taper dowel pin a grade1 steel dowel pin having a ground finish, and conforming to the tolerances given in Table 3 and Table 4 3 Materials Dowel pins shall be manufactured from steels as follows. Types A and B steel dowel pins shall be manufactured from080M15 steel in accordance
23、with BS970-1 or from steels having equivalent mechanical properties. Types C and D steel dowel pins shall be manufactured from220M07 steel in accordance with BS970 or from steels having equivalent mechanical properties. Alternatively dowel pins of all types may be manufactured from steel in accordan
24、ce with BS1407, at the option of the purchaser, the choice being indicated at the time of ordering. 4 Hardness The dowel pins shall be supplied in accordance with the following requirements. Types A and B steel dowel pins manufactured from080M15 steel in accordance with BS970-1 shall be case hardene
25、d and heat treated to a minimum surface hardness of750 HV30 when tested in accordance with BS427. Dowel pins of these types manufactured from steels in accordance with BS1407 shall have a hardness value within the range600HV to700HV30 BS427 or equivalent. The values on other hardness scales may be u
26、sed in accordance with BS860. The threaded portions shall not be case hardened, so that after heat treatment they remain soft. Types C and D steel dowel pins shall not be heat treated and shall therefore be left soft. 5 Dowel pins in blind holes Dowel pins of Types A and B may be supplied with provi
27、sion for the release of air in accordance with Appendix A. 6 Dimensions Dowel pins shall, according to the types required, bemanufactured to conform to the dimensions andtolerances given in Figure 1 and Figure 2, and Table 1 to Table 4. Screw threads of the dowel pins shall be in accordance with BS3
28、643-1 and BS3643-2, coarse pitch series, and shall be for Types A and C to Class6g, and for Types B and D to Class6H. 7 Surface texture When assessed in accordance with BS1134, the surface texture of the fitting cylindrical surfaces for Types A and B shall not be greater than0.4pm R aand for Types C
29、 and D not greater than0.84m R a . Other surfaces shall have a surface texture not greater than1.64m R a . 8 Anti-corrosion treatment Dowel pins shall be given suitable anti-corrosion treatment in accordance with BS1133, Section6. 9 Designation Dowel pins complying with the requirements of this stan
30、dard shall be designated by reference to the type, nominal diameter, length and number of this standard e.g.,dowel pins of Type A, nominal diameter10, length50 shall be designated: Dowel pin A10 50 BS1804.BS1804-3:1973 2 BSI 06-1999 If provision for air release is required (Types A and B only) this
31、must be stated on the order (seeclause12). 10 Marking Each package or lot of dowel pins complying with the requirements of this standard shall be marked by the manufacturer with the type, nominal diameter, length and number of this standard, e.g.dowel pins of Type C, nominal diameter20, length80 sha
32、ll be marked: C20 80 BS1804. 11 Inspection 11.1 The manufacturer shall have suitable purchase, storage and production arrangements to ensure correct identification of material used in the manufacture of each of the different types of dowel pins. 11.2 If so required by the purchaser, the manufacturer
33、s shall give a certificate that each batch, size and type of dowel pin complies with the specified requirements in all respects. 11.3 Where the purchaser requires to carry out his own inspection, the extent and place of inspection shall be stated. 12 Information to be supplied by the purchaser 1) Ty
34、pe of dowel pin required: Type A Type B Type C Type D (see Clause1) 2) Nominal diameter and length (seeTable 1Table 4). 3) Type of steel: BS970 or BS1407 (seeClause3). 4) If Types A or B are required, state whether a flat should be provided as in Appendix A. 5) Inspection, if any, to be carried out
35、by purchaser (see Clause11).BS1804-3:1973 BSI 06-1999 3 Appendix A Fitting dowel pins into blind holes Damage to costly material, apart from danger to personnel, frequently results from attempts to drive dowel pins into blind holes without first making provision for the release of trapped air. Unles
36、s 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 and Figure 2. Figure 1 illustrates Type A with the flat encroaching on the threaded portion to the dimensions shown and Figure 2 i
37、llustrates Type B with the flat along the whole length. However, it may be considered that the strength of the thread would not be impaired if the flat were to be machined along the whole length. Figure 1 Type A dowel pin with air release flat Figure 2 Type B dowel pin with air release flatBS1804-3:
38、1973 4 BSI 06-1999 Table 1 Dimensions of Type A parallel dowel pins with external thread Dimensions in millimetres Diameter D Thread Thread relief Radii Length L Nominal Tolerance Diameter Length Diameter Length Nominal Range Tolerance m5 E F G H J K 50 2 6 3 25, 30, 35 5 M5 9 3.5 +0.009 40, 50 +0.0
39、04 25,30,35 6 M6 10 4.5 40, 50, 60 8 10 35, 40, 50 M8 13 6 2.5 5 +0.012 60, 70, 80 +0.006 3 6 40, 50, 60 10 M10 16 7 70, 80, 90 100 0.25 0.40 16 8 50, 60, 70 12 M12 18 9 80, 90, 100 +0.015 120 +0.007 70, 80, 90 16 M16 24 12 12 100, 120, 140 160 80, 90, 100 20 M20 30 15 4 20 16 120, 140, 160 +0.017 1
40、80, 200 +0.008 90, 100, 120 25 M24 36 18 25 18 140, 160, 180 200BS1804-3:1973 BSI 06-1999 5 Table 2 Dimensions of Type B parallel dowel pins with internal thread Dimensions in millimetres 1 2 3 4 5 6 7 8 9 10 11 12 Diameter D Thread Thread relief Radius J Length L Chamfer depth Core drill hole depth
41、 Nominal Tolerance Diameter Length Diameter Depth Nominal Range Tolerance a F 1 m5 E F G H 50 +0.009 25, 30, 35, 40 6 M4 6 4.5 1 6 0.9 10 +0.004 50, 60 1.2 10 25, 30, 35, 40 8 M5 8 5.5 1.2 12 +0.012 50, 60, 70, 80 +0.006 25, 30, 35, 40, 10 M6 10 6.5 50, 60, 70, 80 1.5 16 90, 100 16 30, 35, 40, 50 12
42、 M8 12 8.5 60, 70, 80, 90 0.25 0.40 1.8 20 +0.015 100, 120 +0.007 1.5 40, 50, 60, 70 16 M10 16 10.5 80, 90, 100 2.5 25 120, 140, 160 +0.017 30, 60, 70, 80 20 M12 18 12.5 20 90, 100, 120 3.0 28 +0.008 140, 160, 180 200 +0.017 60, 70, 80 25 M16 24 16.5 1.5 25 90, 100, 120 4.0 35 +0.008 140, 160, 180 2
43、00, 230BS1804-3:1973 6 BSI 06-1999 Table 3 Dimensions of Type C taper dowel pins with external thread Dimensions in millimetres 1 2 3 4 5 6 7 8 9 10 11 Diameter D Thread relief Thread relief Radii Length L Nominal Tolerance Diameter Length Diameter Length Nominal Range Tolerance h10 E F G H J K 50 2
44、 6 3 25, 30, 35 5 M5 9 3.5 0.0 40, 50 0.048 25, 30, 35 6 M6 10 4.5 40, 50, 60 10 35, 40, 50 8 M8 13 6 2.5 5 0.0 60, 70, 80 0.058 3 40, 50, 60 10 M10 16 7 6 70, 80, 90 100 0.25 0.40 16 50, 60, 70 12 M12 18 9 8 80, 90, 100 0.0 120 0.070 70, 80, 90 16 M16 24 12 12 100, 120 140, 160 60, 90, 100 20 0.0 M
45、20 30 15 4 20 16 120, 140, 160 180, 200 0.084 100, 120, 140 25 M24 36 18 25 18 160, 180, 200BS1804-3:1973 BSI 06-1999 7 Table 4 Dimensions of Type D taper dowel pins with internal thread Dimensions in millimetres 1 2 3 4 5 6 7 8 9 10 11 12 Diameter D Thread Thread relief Radius J Length Chamfer dept
46、h Core drill hole depth Nominal Tolerance Diameter Length Diameter Length Nominal Range Tolerance a F 1 h10 E F G H 50 0 25, 30, 35 6 M4 6 4.5 1 6 0.9 10 0.048 40, 50, 60 10 25, 30, 35 8 M5 8 5.5 40, 50, 60 1.2 12 0 70, 80 0.058 25, 30, 35 10 M6 10 6.5 1.2 40, 50, 60 1.5 16 70, 80, 90 100 16 30, 35,
47、 40 12 M8 12 8.5 50, 60, 70 0.25 0.40 1.8 20 80, 90, 100 0 120 0.070 1.5 40, 50, 60 16 M10 16 10.5 70, 80, 90 2.5 25 100, 120, 140 160 0 50, 60, 70 20 M12 18 13 20 80, 90, 100 3.0 28 0.084 120, 140, 160 180, 200BS1804-3:1973 8 BSI 06-1999 Publications referred to This standard makes reference to the
48、 following British Standards: BS427, Method for Vickers hardness test. BS860, Tables for comparison of hardness scales. BS970, Wrought steels for mechanical and allied engineering purposes. BS970-1, General inspection and testing procedures and specific requirements for carbon, carbonmanganese, allo
49、y and stainless steels. BS1133, Packaging code. BS1133-6, Temporary protection of metal surfaces against corrosion (during transport and storage). BS1134, Method for the assessment of surface texture. BS1407, High carbon bright steel (silver steel). BS3643, ISO metric screw threads. BS1804-3:1973 BSI 06-1999 BSI Certification Trade Mark The Kitemark The British Standards Institution is the owner of a registered certification trade mark. It is usually associated with the words “approved to British Standard
