1、BRITISH STANDARD BS4429:1987 Incorporating Amendment No.1 Specification for Rigging screws and turnbuckles for general engineering, lifting purposes and pipe hanger applications UDC621.889.2BS4429:1987 This British Standard, having been prepared under the directionof the Mechanical Handling Standard
2、s Committee,was published underthe direction of the BoardofBSI and comesintoeffecton 30 April1987 BSI07-1999 First published March1969 First revision April1987 The following BSI references relate to the work on this standard: Committee reference MHE/1 Draft for comment85/72302DC ISBN 0 580 15356 8 C
3、ommittees responsible for this British Standard The preparation of this British Standard was entrusted by the Mechanical Handling Standards Committee (MHE/-) to Technical Committee MHE/1, upon which the following bodies were represented: Associated Offices Technical Committee British Chain Manufactu
4、rers Association British Coal British Forging Industry Association British Ports Association and the National Association of Ports Employers British Railways Board Chain Testers Association of Great Britain Corporation of Trinity House Department of Trade and Industry (National Physical Laboratory)
5、Federation of Manufacturers of Construction Equipment and Cranes Federation of Wire Rope Manufacturers of Great Britain Health and Safety Executive Lloyds Register of Shipping Ministry of Defence The following bodies were also represented in the drafting of the standard, through subcommittees and pa
6、nels: Association of Supervisory and Executive Engineers British Steel Industry Drop Forging Research Association Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Amendments issued since publication Amd. No. Date of issue Comments 5875 June1989 I
7、ndicated by a sideline in the marginBS4429:1987 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword iii Section 1. General requirements 1.1 Scope 1 1.2 Definitions 1 1.3 Lifting applications 1 1.4 Size 1 1.5 Tolerance on dimensions 1 1.6 Heat treatment 1 1.7 Hot dip galvan
8、izing 1 1.8 Screw threads 1 1.9 Freedom from defects 1 1.10 Proof loading 1 1.11 Marking 2 1.12 Test certificate 2 Section 2. Specific requirements for rigging screws 2.1 General 3 2.2 Tubular body 3 2.3 Workmanship 3 2.4 Attachments 3 2.5 Types of rigging screw 4 2.6 Open and closed dimensions 4 2.
9、7 Safe working loads 4 Section 3. Specific requirements for turnbuckles 3.1 General 7 3.2 Designation 7 3.3 Open body 7 3.4 Workmanship 7 3.5 Attachments 7 3.6 Types of turnbuckle 8 3.7 Open and closed dimensions 8 3.8 Safe working loads 8 Section 4. Specific requirements for attachments 4.1 General
10、 11 4.2 Screwed elongated eyes 11 4.3 Screwed forks 12 4.4 Screwed trapezoidal hooks 13 4.5 Lock-nuts 13 Appendix A Information to be supplied by the purchaser with the enquiryandorder 15 Appendix B Notes on design 15 Appendix C Selection, application and use of rigging screws and turnbucklesforlift
11、ing applications 15 Figure 1 Tubular body for rigging screws 3 Figure 2 Types of rigging screw 5 Figure 3 Hexagon-ended open body for turnbuckles 7 Figure 4 Types of turnbuckle 9 Figure 5 Screwed elongated eye 11BS4429:1987 ii BSI 07-1999 Page Figure 6 Screwed fork 12 Figure 7 Screwed trapezoidal ho
12、ok for turnbuckles 14 Table 1 Recommended maximum sizes of marking stamps 2 Table 2 Tubular bodies for rigging screws 4 Table 3 Open and closed dimensions (H) and safe working loadsforriggingscrews 6 Table 4 Hexagon-ended open bodies for turnbuckles 8 Table 5 Open and closed dimensions (H) and safe
13、working loadsforturnbuckles 10 Table 6 Screwed elongated eyes 11 Table 7 Screwed forks (supplied complete with bolt and nut) 13 Table 8 Screwed trapezoidal hooks for turnbuckles 14 Table 9 Types of defect found in in-service inspections and actionstobetakenin the event of a defect 16 Publications re
14、ferred to Inside back coverBS4429:1987 BSI 07-1999 iii Foreword This revised British Standard has been prepared under the direction of the Mechanical Handling Standards Committee. BS4429 was first issued in1969 as a revision of BS716 “Rigging screws and stretching screws for general engineering purp
15、oses” and BS4013 “Rigging screws for shipping purposes and for guyed masts”. This revision of BS4429 supersedes BS4429:1969 which is withdrawn. It takes account of commercially accepted items and introduces a new range of hexagon-ended turnbuckles specifically for general engineering, lifting purpos
16、es and for pipe hanger applications. The safe working load (SWL) ratings for rigging screws and turnbuckles have been uprated by25%. SWL values for pipe hanger turnbuckles take cognizance of work currently being undertaken in ISO/TC5/SC1. Rigging screws are specified with combinations of screwed elo
17、ngated eyes and screwed forks. Turnbuckles are specified with combinations of screwed elongated eyes, screwed forks or screwed hooks (hitherto the term “stretching screw” was used). Reference should be made to BS3974-1 for fittings for pipe hanger turnbuckles. Rigging screws are normally supplied in
18、 the ungalvanized condition (i.e.self-coloured) but the purchaser has the option of ordering rigging screws in the hot dip galvanized condition, provided this is stated on his enquiry and order. The reverse applies to turnbuckles, which are normally supplied in the hot dip galvanized condition, with
19、 the purchaser having the option to order self-coloured turnbuckles (see Appendix A). It is sometimes desirable to fit the threaded shanks of rigging screws and turnbuckles with lock-nuts to prevent possible slacking back, particularly where vibration occurs. It is pointed out that, if lock-nuts are
20、 fitted, dimension H (closed) will be increased by twice the thickness of one nut. Details of the information that should be supplied with any enquiry and order are given in Appendix A. This standard is based on a design study carried out at the National Physical Laboratory and funded by the Health
21、and Safety Executive. Two reports covering this design study are available from the Natural Physical Laboratory, Teddington, Middlesex TW110LW entitled: “NPL Report DMA (A)108 The technical background to the revision of BS4429:1969 Rigging screws and turnbuckles”, by T.A.E. Gorley; and “NPL Report D
22、MA (A)125 The effects of tolerances on the technical background of rigging screws, turnbuckles and associated components in the revision of BS4429:1969”, by T.A.E. Gorley. This design study was supplemented by actual testing of components at the laboratories of the Health and Safety Executive. A rep
23、ort by the Health and Safety Executive, reference IR/L/ME/86/23, entitled “Tests to failure of rigging screw and turnbuckle components revision of BS4429” gives the results of proving tests carried out on components made to this British Standard. The Secretary of State for Industry accepts no respon
24、sibility for loss or damage arising from the use of the recommendations made in the report except to the extent that such loss or damage arises from the negligence of the Secretary or his servants or agents. In this standard, attachments having screwed ends are geometrically similar throughout their
25、 respective ranges, taking account of commercial considerations. The screwed elongated eyes of these rigging screws have been proportioned to accept higher tensile steel shackles. The terms “British Standard rigging screw” or “British Standard turnbuckle” should be taken as applying only to those ri
26、gging screws, turnbuckles and attachments which comply with this British Standard.BS4429:1987 iv BSI 07-1999 A new Appendix B entitled “Notes on design” has been added giving recommendations on the geometric formulae to be applied when sizes not covered by this standard are required. A new Appendix
27、C has also been added in this revision covering the selection, application and use of rigging screws and turnbuckles. Whilst this standard is for general engineering, lifting and pipe hanger purposes it is recognized that the items covered may also be specified for other uses such as rigging of mast
28、s, etc.Whilst the information given in this standard applies, particular precautions should be taken in respect of exterior environmental conditions, oscillation/vibration caused by high winds, etc. A British Standard does not purport to include all the necessary provisions of a contract. Users of B
29、ritish 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 comprises a front cover, an inside front cover, pagesi toiv, pages1 to16, an inside back cover and a back cover
30、. 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.BS4429:1987 BSI 07-1999 1 Section 1. General requirements 1.1 Scope This British Standard specifies materials, components, dimension
31、s, finishes and tests for rigging screws and turnbuckles of the following types and nominal sizes for both lifting and non-lifting applications. Lock-nuts are also covered (see section 4). Attachments for turnbuckles for use in pipe hanger applications are excluded from this British Standard (seeBS3
32、974-1). NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 1.2 Definitions For the purposes of this British Standard, the following definitions apply. 1.2.1 rigging screw a tubular body internally threaded at each end, with one right-hand and one lef
33、t-hand thread, having attachments of required form, i.e.screwed eyes or screwed forks 1.2.2 turnbuckle an open body consisting of reins, with bosses at each end and internally threaded at each end, with one right-hand and one left-hand thread, having attachments of required form, e.g.screwed eyes, s
34、crewed forks, screwed hooks, or for use, without attachments, for pipe hanger applications 1.3 Lifting applications Only rigging screws and turnbuckles that are marked with the appropriate safe working load(see1.11) after proof loading (see 1.10) shall be used for lifting applications. 1.4 Size The
35、size of the rigging screw or turnbuckle shall be the diameter A, in millimetres, of the screwed shank in accordance with Table 2 to Table 8 inclusive. 1.5 Tolerance on dimensions When components are manufactured by the drop forging process, the tolerances on dimensions, etc. shall be quality F as sp
36、ecified in BS4114. When hand forged, the variation from any of the dimensions given in the tables of this standard shall not exceed . When swaging is involved in the forming of a rigging screw body, the dimensions shall comply with 2.3. Tolerances on screw threads are given in1.8. 1.6 Heat treatment
37、 After completion of all forging operations and before machining, all components shall be hardened and tempered with the exception of screwed elongated eyes and screwed forks of size M64 and over (see4.2.1 and4.3.1). 1.7 Hot dip galvanizing 1.7.1 Rigging screws All components of all rigging screws s
38、hall normally be supplied in the self-coloured condition. NOTEIf rigging screws are required in the hot dip galvanized condition, this should be stated on the enquiry and order (seeAppendix A) and should be in accordance with BS729. 1.7.2 Turnbuckles All components of all turnbuckles, with the excep
39、tion of the screw threads, shall normally be supplied in the hot dip galvanized condition in accordance with BS729. NOTEIf turnbuckles are required in the self-coloured condition this should be stated on the enquiry and order (see Appendix A). 1.8 Screw threads The screw threads of the bodies of rig
40、ging screws and turnbuckles and their attachments shall comply with BS3643-2, coarse pitch series, class7H/8g (free fit). For sizes M72 and over, a constant pitch series of6mm shall be used. 1.9 Freedom from defects Each component of the completed rigging screw/turnbuckle shall be carefully examined
41、 before assembly and shall be free from any visible flaw or defect. 1.10 Proof loading The testing machine used for proof loading shall have been verified in accordance with BS1610-2 and maintained within grade2.0 as specified in BS1610-1. Rigging screws:8mm to100mm, size of screw thread Turnbuckles
42、 :8mm to72mm, size of screw thread series no.1, seriesno.2 and pipe hanger applications +7.5 0 %BS4429:1987 2 BSI 07-1999 Each complete rigging screw or turnbuckle to be used for lifting purposes shall, after manufacture, heat treatment and assembly, be subjected to a proof load equal to twice the s
43、afe working load (seeTable 3 and Table 5) which it shall withstand without showing signs of permanent deformation. Each item to be tested shall be in the fully extended (open) position, in the manner in which the working load is applied in service. After removal of the proof load, each rigging screw
44、 or turnbuckle shall be dismantled and thoroughly examined by a competent person and shall be accepted only if found to be free from visible flaws or defects. NOTEIn the cases of rigging screws or turnbuckles that are not to be used for lifting purposes the proof loading is optional and is to be car
45、ried out only if specified by the purchaser on his enquiry and order (see Appendix A). 1.11 Marking 1.11.1 All rigging screws and turnbuckles shall be marked with such symbols and marks as will permit identification with the manufacturers test certificate (see 1.12) in the following locations: a) fo
46、r tubular bodies of rigging screws, in the area indicated in Figure 1; b) for open bodies of turnbuckles, on the centre of the length of one of the reins. 1.11.2 Additionally, after a rigging screw or turnbuckle to be used for lifting purposes has been proof loaded in accordance with 1.10, the relev
47、ant area of the body shall be permanently and legibly stamped with the appropriate safe working load, SWL, as given in Table 3 or Table 5. 1.11.3 Care shall be taken that the marking stamps used have a concave surface, when applicable. In all cases marking shall be carried out on the bodies of riggi
48、ng screws and turnbuckles in the closed position with the body adequately supported, so that the resultant identification is neither too sharp nor excessive in depth. NOTEThe recommended maximum sizes of marking stamps to be used on the bodies of rigging screws and turnbuckles are indicated in Table
49、 1. Table 1 Recommended maximum sizes of marking stamps 1.12 Test certificate When proof loading, in accordance with 1.10, has been satisfactorily carried out on each rigging screw and/or turnbuckle the manufacturer shall provide a test certificate with each consignment giving at least the following information for each: a) the number and date of this British Standard, i.e.BS4429:1987 1) ; b) a distinguishing mark to enable the particular rigging screw or turnbuckle to be identified with the test certificate; c) the proof load applied (see
