1、BRITISH STANDARD BS 4894:1993 Specification for Bifurcated rivets for general purpose use (metric series)BS4894:1993 This British Standard, having been prepared under the directionof the General Mechanical Engineering Standards Policy Committee, waspublished under the authorityof the Standards Board
2、and comes into effect on 15May1993 BSI 07-1999 First published April 1973 Second edition May 1993 The following BSI references relate to the work on this standard: Committee reference GME/6 Draft for comment 89/75630 DC ISBN 0 580 21745 0 Committees responsible for this British Standard The preparat
3、ion of this British Standard was entrusted by the General Mechanical Engineering Standards Policy Committee (GME/-) to Technical Committee GME/6, upon which the following bodies were represented: British Friction Materials Council British Industrial Fasteners Federation British Railways Board Britis
4、h Steel Industry British Steel Industry (Wire Section) Institution of Structural Engineers Ministry of Defence National Association of Fastener Stockholders Society of Motor Manufacturers and Traders Limited Amendments issued since publication Amd. No. Date CommentsBS4894:1993 BSI 07-1999 i Contents
5、 Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions and symbols 1 4 Dimensions 1 5 Characteristics 1 6 Designation for the purpose of an enquiry or order 1 Annex A (informative) Use and application 4 Annex B (informative) Aspects of manufacture 4 Annex
6、C (informative) Dimensional relationships 4 Figure 1 Dimensions of bifurcated rivets with head types: countersunk and oval 3 Table 1 Dimensions and nominal lengths 2 Table 2 Characteristics 3 List of references Inside back coverBS4894:1993 ii BSI 07-1999 Foreword This British Standard has been prepa
7、red under the direction of the General Mechanical Engineering Standards Policy Committee. It supersedes BS4894:1973, which is withdrawn. The principal changes that have been made in this edition are as follows. a) A hardening up of all the metric dimensions to replace the soft metric equivalents of
8、the inch dimensions in BS4894:1973. b) The alteration of certain tolerances to allow the product to be produced either by cold forging or machining from solid. c) The addition of aluminium as a material from which rivets may be manufactured. The use and application of rivets with different head styl
9、es is given inAnnex A. 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 T
10、his document comprises a front cover, an inside front cover, pages i and ii, pages1 to 4, 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.BS489
11、4:1993 BSI 07-1999 1 1 Scope This British Standard specifies the materials and dimensions for bifurcated rivets with shank diameters of2mm to5mm inclusive and with oval and155 countersunk heads. A choice of slot depths is given; a general purpose slot depth for use when joining soft materials such a
12、s leather, cloth, paper and soft wood, and a shorter slot depth for use with harder materials such as hardwood and thin metal. 2 References 2.1 Normative references This British Standard incorporates, by reference, provisions from specific editions of other publications. These normative references a
13、re 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 apply to this British Standard only when incorporated in it by updating or revision. 2.2 Informative references This British S
14、tandard refers to other publications that provide information of guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest edition. 3 Definitions and symbols For the purposes of this British
15、Standard, the following definitions apply. 3.1 head the upset portion of the rivet. The symbol for the head diameter is d k . The height of the oval head is denoted by the symbolk 3.2 radius the part of the rivet that joins the shank to the head smoothly and is denoted by the symbol r 3.3 shank the
16、part of the rivet that extends from the underside of the head to the end of the rivet; its cross section is essentially round. The diameter of the cross section is denoted by the symbol d s 3.4 waisting the reduction in the shank diameter between the head and the slot which can occur with longer riv
17、ets (seeB.1). This reduced shank diameter is denoted by the symbol d d 3.5 length dimension measured for a countersunk head rivet from the top of the head to the end of the rivet, and that for an oval head rivet from the underside of the head to the end of the rivet. This is denoted by the symbol l
18、3.6 slot the part of the shank that forms two legs. The slot depth is denoted by the symbol l dand the width of the innermost part is denoted by n. The included angle between the two legs is denoted by the symbol!. (SeeB.2 for the aspects of manufacture.) 4 Dimensions The dimensions and tolerances o
19、f bifurcated rivets shall be in accordance withTable 1 andFigure 1. (SeeAnnex C for the dimensional relationships.) 5 Characteristics Material requirements for bifurcated rivets shall be as given inTable 2. 6 Designation for the purpose of an enquiry or order When designating for the purpose of an e
20、nquiry or order, the following information shall be given: a) the material; b) the type of head, i.e. oval or countersunk; c) general product description, i.e. bifurcated rivets; d) the nominal size (shank diameter) of the product in millimetres; e) the nominal length in millimetres; f) the type of
21、slot, i.e. general purpose or short slot; g) the number of this British Standard, i.e. BS4894:1993 1) ; h) details of the finish (if required). 1) Marking BS4894:1993 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer
22、s that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the claimants responsibility. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable.BS4894:1993 2 BSI 07-1999 Example The designation
23、of a bifurcated rivet with shank diameter4mm, nominal length10mm, made of steel, with a countersunk head and general purpose slot is as follows. Steel countersunk head bifurcated rivet4 10 general purpose slot to BS4894. Table 1 Dimensions and nominal lengths Dimensions in millimetres Nominal diamet
24、er 2 2.5 3 4 5 d s max. 2.05 2.55 3.05 4.06 5.06 min. 1.95 2.45 2.95 3.94 4.94 d d min. 1.90 2.40 2.90 3.88 4.88 d k max. 4.20 5.00 6.00 8.00 9.70 min. 3.72 4.52 5.52 7.42 9.12 k max. 0.70 0.88 1.05 1.28 1.60 min. 0.56 0.74 0.91 1.03 1.35 r max. 0.36 0.42 0.46 0.64 0.76 min. 0.23 0.26 0.30 0.38 0.45
25、 n max. 0.75 0.85 1.00 1.25 1.45 min. 0.50 0.60 0.75 1.00 1.20 ! max. 12 12 12 12 12 min. 8 8 8 8 8 l tolerance 0 +1 0 +1 0 +1 0 +1 0 +1.25 l dtolerance 0 +1.5 0 +1.5 0 +1.5 0 +1.5 0 +1.5 l nominal l dgeneral purpose l dshort 3 1.2 4 2 5 3 6 4 3 7 5 3 Range of commercial lengths 8 6 4 10 7 4 12 8 5
26、14 8 5 16 8 5BS4894:1993 BSI 07-1999 3 Table 2 Characteristics Figure 1 Dimensions of bifurcated rivets with head types: countersunk and oval Material Steel Copper Brass Aluminium Specification Conforming to BS 3111-1:1987 type 0/1 and 0/2 or equivalent Conforming to BS 2873:1969 type C101 or equiva
27、lent Conforming to BS 2873:1969 type C108 or equivalent Conforming to BS 1473:1972 type 1050A or equivalent Finish Rivets shall be supplied conditioned after processing to remove surplus lubricants a Acceptability Acceptance criteria shall be as given in BS 6587:1985 and ISO 3269:1984 a If electropl
28、ating is requested in the enquiry or order the appropriate British Standard should be followed. Other alternative or additional finishes should be agreed between the supplier and purchaser.BS4894:1993 4 BSI 07-1999 Annex A (informative) Use and application A.1 Performance Bifurcated rivets are used
29、for the fastening together of unpierced leather, cloth, paper, card, wood and thin metal strips, and can fasten three strips of different materials under appropriate conditions. The clench is made by forming the legs outwards and back towards the head to secure the fastened components between the he
30、ad and the deformed legs. So long as the bifurcated legs are well spread, fastening is tolerant of clench quality, and the joint strength is related more to the strength of the materials being fastened. A.2 Choice of head style A.2.1 The countersunk head top is essentially flush with the surface of
31、the fastened component after setting. To ensure good seating and holding power, the component countersink included angle should bedegrees and its diameter should exceed the maximum head diameter of the rivet. A.2.2 The oval head projects above the surface of the fastened components after setting. An
32、nex B (informative) Aspects of manufacture B.1 Waisting In cold forging, the wire diameter has to be sufficiently smaller than that of the heading die to allow for insertion into the die before forging. In longer rivets there will be a portion between the head and the deepest part of the slot where
33、the wire may not expand to touch the walls of the die. In the finished rivet this will appear as waisting of the shank. Waisting is permitted wherel 2d s , at least2mm from the head. B.2 Slots Slots will be slightly tapered to suit manufacturing methods. Where the user has a special requirement, thi
34、s should be agreed between manufacturer and purchaser. Annex C (informative) Dimensional relationships The relationships of the dimensions given in this standard are as follows. NOTEThe tolerance band,h12, is part of a set of commonly used tolerances as given in BS4500-1.1 and BS 4500-1.2. 155 05 d
35、d = d s h12 (see note) d kmax. = 2d s+ 0.2 where d sk 2 = 2d s where d s 2 and k 4 = 2d s 0.3 where d s 4 k max. = 0.35d s where d s k 3 = 0.32d s where d s 3 n min. = 0.25d s r min. = 0.075d s+ 0.075BS4894:1993 BSI 07-1999 List of references (see clause 2) Normative references BSI standards publica
36、tions BRITISH STANDARDS INSTITUTION, London BS 1473:1972, Specification for wrought aluminium and aluminium alloys for general engineering purposes rivet, bolt and screen stock. BS 2873:1969, Specification for copper and copper alloys. Wire. BS 3111, Steel for cold forged fasteners and similar compo
37、nents. BS 3111-1:1987, Specification for carbon and low alloy steel wire. BS 6587:1985, Method of acceptance inspection for fasteners. ISO standards publications INTERNATIONAL ORGANIZATION FOR STANDARDIZATION, Geneva. (Publication available from BSI Sales.) ISO 3269:1984, Fasteners Acceptance inspec
38、tion. Informative references BSI standards publications BRITISH STANDARDS INSTITUTION, London BS 4500, ISO limits and fits. BS 4500-1, General tolerances and deviations. BS 4500-1.1:1990, Specifications for bases of tolerances, deviations and fits. BS 4500-1.2:1990, Tables of commonly used tolerance
39、 and grades and limits deviations for holes and shafts. BS 4894:1993 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level.
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