1、BRITISH STANDARD BS4168-6: 1982 Incorporating Amendment No.1 Hexagon socket screws and wrench keys: metric series Part 6: Specification for hexagon socket button head screws UDC 621.882.215.6BS4168-6:1982 This British Standard, having been prepared under the directionof the Mechanical Engineering St
2、andards Committee, was published underthe authority of theBoardofBSI and comesintoeffecton 31 August1982 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference GME/9 (formerly MEE/60) Draft for comment80/78282 DC ISBN 0 580 12442 8 Cooperating organizations
3、 The Mechanical Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Associated Offices Technical Committee Department of Transport Association of Consulting Engineers Electricity Supply Industry in England and Ass
4、ociation of Hydraulic Equipment Wales Manufacturers Energy Industries Council Association of Mining Electrical and Engineering Equipment Users Association Mechanical Engineers Federation of Manufacturers of Construction British Compressed Air Society Equipment and Cranes British Electrical and Allie
5、d Manufacturers Health and Safety Executive Association (BEAMA)* Institution of Gas Engineers British Gas Corporation Institution of Mechanical Engineers British Gear Manufacturers Association Institution of Plant Engineers British Internal Combustion Engine Institution of Production Engineers* Manu
6、facturers Association* Lloyds Register of Shipping British Pump Manufacturers Association London Transport Executive British Steel Corporation Machine Tool Industry Research Association British Steel Industry* Ministry of Defence* Chartered Institution of Building Services National Coal Board* Crown
7、 Agents for Oversea Governments Oil Companies Materials Association and Administrations Process Plant Association Department of Industry (Mechanical Society of Motor Manufacturers and Traders Engineering) Limited* Department of Industry (National Engineering Telecommunication Engineering and Laborat
8、ory)* Manufacturing Association (TEMA)* Department of the Environment (PSA) Water-tube Boilermakers Association Department of Trade (Marine Division) The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrust
9、ed with the preparation of this British Standard: British Constructional Steelwork Federation of British Hand Tool Association Manufacturers British Industrial Fasteners Federation Gauge and Tool Makers Association British Railways Board Washer Manufacturers Association of British Steel Industry (Wi
10、re Section) Great Britain Electronic Engineering Association Amendments issued since publication Amd. No. Date of issue Comments 5657 August 1987 Indicated by a sideline in the marginBS4168-6:1982 BSI 07-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 Refere
11、nces 1 3 Dimensions 1 4 Specifications and reference standards 3 5 Designation 3 Figure 1 Button head screws 1 Table 1 Dimensions 2 Table 2 Specifications and reference standards 3 Publications referred to Inside back coverBS4168-6:1982 ii BSI 07-1999 Foreword This British Standard has been prepared
12、 under the direction of the Mechanical Engineering Standards Committee and forms part of the revision of the 1967 edition. It is one of a series of specifications, of which the full list is as follows. Part 1: Specification for hexagon socket head cap screws; Part 2: Specification for hexagon socket
13、 set screws with flat point; Part 3: Specification for hexagon socket set screws with cone point; Part 4: Specification for hexagon socket set screws with dog point; Part 5: Specification for hexagon socket set screws with cup point; Part 6: Specification for hexagon socket button head screws; Part
14、7: Specification for hexagon socket shoulder screws 1) ; Part 8: Specification for hexagon socket countersunk head screws 1) ; Part 9: Wrench keys 1) . This Part of this standard is based on a draft standard, prepared by ISO/TC2“Fasteners”. Although the tolerances on some features differ from those
15、specified in the 1967 edition, screws complying with this standard are generally interchangeable with screws manufactured to the 1967 edition. If, in special cases, requirements other than those listed in this standard are necessary, it is recommended that they should be selected from the standards
16、referred to in clause4. This standard has been drafted to be consistent with other Parts in the series which themselves have reproduced tables and figures from the equivalent ISO standards. Certain conventions are therefore not identical with those used in British Standards; attention is especially
17、drawn to the following. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards
18、 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 andii, pages1 to4, an inside back cover and a back cover. This standard
19、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. 1) In course of preparation.BS4168-6:1982 BSI 07-1999 1 1 Scope This Part of this British Standard specifies requirements for hexagon socket button
20、 head screws with ISO metric threads and diameters from3mm up to and including 16mm. NOTEParticular attention is drawn to the note in clause 4 concerning the limitation on tensile strength. 2 References The titles of the publications referred to in this standard are listed on the inside back cover.
21、3 Dimensions The dimensions of the button head screws shall be in accordance with Figure 1 and Table 1. NOTEFor broached sockets which are at the maximum limit of size, the overcut resulting from drilling shall not exceed20% of the length of any flat of the socket. Figure 1 Button head screwsBS4168-
22、6:1982 2 BSI 07-1999 Table 1 Dimensions Dimensions in millimetres. Thread size d M3 M4 M5 M6 M8 M10 M12 M16 P a 0,5 0,7 0,8 1 1,25 1,5 1,75 2,0 a max. b 1,0 1,4 1,6 2,0 2,5 3,0 3,5 4,0 d a max. 3,6 4,7 5,7 6,8 9,2 11,2 13,7 17,7 d k max. 5,7 7,6 9,5 10,5 14 17,5 21,0 28,0 min. 5,4 7,24 9,14 10,07 13
23、,57 17,07 20,48 27,48 e min. c 2,3 2,87 3,44 4,58 5,72 6,86 9,15 11,43 k max. 1,65 2,2 2,75 3,3 4,4 5,5 6,6 8,8 min. 1,4 1,95 2,5 3 4,1 5,2 6,24 8,44 r min. 0,1 0,2 0,2 0,25 0,4 0,4 0,6 0,6 s nominal 2,0 2,5 3,0 4,0 5,0 6,0 8,0 10,0 min. 2,02 2,52 3,02 4,02 5,02 6,02 8,025 10,025 max. 2,045 2,56 3,0
24、8 4,095 5,095 6,095 8,115 10,115 t min. 1,04 1,3 1,56 2,08 2,6 3,12 4,16 5,20 w min. 0,2 0,3 0,38 0,74 1,05 1,45 1,63 2,25 l nomina l min. max. 6 5,76 6,24 8 7,71 8,29 10 9,71 10,29 Range 12 11,65 12,35 16 15,65 16,35 of 20 19,58 20,42 25 24,58 25,42 popular 30 29,58 30,42 35 34,5 35,5 lengths 40 39
25、,5 40,5 45 44,5 45,5 50 49,5 50,5 For lengths below the bottom stepped line the thread lengths, at the option of the manufacturer, can be between a minimum of2d +12mm and a maximum which is within2P of the head. a P =pitch of the thread. b a min. not less than1P. c e min.=1,14 s min.BS4168-6:1982 BS
26、I 07-1999 3 4 Specifications and reference standards The button head screws shall be manufactured in accordance with the requirements specified in Table 2 and the relevant reference standards as noted. 5 Designation When designating button head screws, for the purpose of an enquiry or order, the inf
27、ormation as the following example shall be given. Hexagon socket button head screw thread size d =M12, nominal length l=40mm: Hexagon socket button head screw BS4168 M12 40. Table 2 Specifications and reference standards Material Steel Thread Tolerances 5g6g British Standard BS3643 Mechanical proper
28、ties Class 12.9 a British Standard BS6104-1 Tolerances Product grade A British Standard BS6322-1 Discontinuities BS b Finish black oxide (thermal or chemical) Requirements for electroplating are covered in BS3382. If different electroplating requirements are desired or if requirements are needed for
29、 other finishes, they should be negotiated between customer and supplier. Acceptability For acceptance procedure see BS6587 a Because of their head configurations, these screws may not meet the minimum ultimate tensile load for property class12.9, given in Table 6 of BS6104-1:1981, when tested in ac
30、cordance with test programme B. They are nevertheless required to meet the other material and property requirements for property class12.9 in BS6104-1:1981. In addition, when full size screws are loaded with the head supported on a parallel collar using the type of testing fixture illustrated in Fig
31、ure 2 of BS6104-1:1981, they shall withstand the following loads without fracture: Thread size d M3 M4 M5 M6 M8 M10 M12 M16 Test load N 5200 9100 14800 20900 38100 60300 87700 163000 If tested to failure, the fracture may occur in the threaded section, the head or at the head-shank junction. b Waiti
32、ng the publication of ISO6157-3.blank blank 4BS4168-6:1982 BSI 07-1999 Publications referred to BS3382, Electroplated coatings on threaded components. BS3643, ISO metric screw threads. BS6104, Mechanical properties of fasteners. BS6104-1, Specification for bolts, screws and studs. BS6322, Tolerances
33、 for fasteners. BS6322-1, Specification for tolerances of bolts, screws and nuts with thread diameters U 1.6mm andk 150mm and product grades A, B and C. BS6587, Method of acceptance inspection for fasteners. BS4168-6: 1982 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI i
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