1、BRITISH STANDARD BS4168-7: 1982 Incorporating Amendment No.1 Hexagon socket screws and wrench keys: metric series Part7: Specification for hexagon socket shoulder screws UDC 621.882.215.6.091.1BS4168-7:1982 This British Standard, having been prepared under the directionof the Mechanical Engineering
2、Standards Committee, was published underthe authority of the BoardofBSI and comes intoeffecton 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 comment 80/78226 DC ISBN 0 580 12795 8 Cooperating organizat
3、ions 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 Trade (Marine Division) Association of Consulting Engineers Department of Transport Asso
4、ciation of Hydraulic Equipment Electricity Supply Industry in England and Manufacturers Wales Association of Mining Electrical and Energy Industries Council Mechanical Engineers Engineering Equipment Users Association British Compressed Air Society Federation of Manufacturers of Construction British
5、 Electrical and Allied Manufacturers Equipment and Cranes Association (BEAMA)* Health and Safety Executive British Gas Corporation Institution of Gas Engineers British Gear Manufacturers Association Institution of Mechanical Engineers British Internal Combustion Engine Institution of Plant Engineers
6、 Manufacturers Association* Institution of Production Engineers* British Pump Manufacturers Association Lloyds Register of Shipping British Steel Corporation London Transport Executive British Steel Industry* Machine Tool Industry Research Association Chartered Institution of Building Services Minis
7、try of Defence* Crown Agents for Oversea Governments and National Coal Board* Administrations Oil Companies Materials Association Department of Industry (Mechanical Process Plant Association Engineering) Society of Motor Manufacturers and Traders Department of Industry (National Limited* Engineering
8、 Laboratory)* Telecommunication Engineering and Department of the Environment (PSA) Manufacturing Association (TEMA)* Water-tube Boilermakers Association The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee ent
9、rusted with the preparation of this British Standard: British Constructional Steelwork Association Federation of British Hand Tool British Industrial Fasteners Federation Manufacturers British Railways Board Gauge and Tool Makers Association British Steel Industry (Wire Section) Washer Manufacturers
10、 Association of Electronic Engineering Association Great Britain Amendments issued since publication Amd. No. Date of issue Comments 5658 August 1987 Indicated by a sideline in the marginBS4168-7:1982 BSI 07-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 Re
11、ferences 1 3 Dimensions and surface detail 1 4 Tolerances of form and position 4 5 Specifications and reference standards 5 6 Designation 5 Figure 1 Shoulder screws 2 Figure 2 Tolerances of form and position 4 Table 1 Dimensions 3 Table 2 Specifications and reference standards 5 Publications referre
12、d to Inside back coverBS4168-7:1982 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of the Mechanical Engineering Standards Committee and forms part of the revision of BS4168:1967. It is one of a series of specifications, of which the full list is as follows. Part
13、 1: Specification for hexagon socket head cap screws; Part 2: Specification for hexagon socket 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
14、 set screws with cup point; Part 6: Specification for hexagon socket button head screws; Part 7: Specification for hexagon socket shoulder screws; Part 8: Specification for hexagon socket countersunk head screws; Part 9: Specification for wrench keys 1) . This Part of this standard is based on a dra
15、ft standard prepared by ISO/TC2 “Fasteners”. It differs from the ISO/TC2 draft in that note has been taken of European and United Kingdom market requirements and that shoulder sizes6mm,12mm and24mm are specified in place of shoulder sizes6.5mm,13mm and25mm. If, in special cases, requirements other t
16、han those listed in this standard are necessary, it is recommended that they should be selected from the standards referred to in clause 5. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicat
17、ion. 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 to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and m
18、ay have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In course of preparation.BS 4168-7:1982 BSI 07-1999 1 1 Scope This Part of BS4168 specifies requirements for hexagon socket shoulder screws with ISO metric threads and shoulder diameters
19、from6mm up to and including24mm. NOTEParticular attention is drawn to the note in clause 5 concerning the limitation on tensile testing. 2 References The titles of the standards publications referred to in this standard are listed on the inside back cover. 3 Dimensions and surface detail The dimensi
20、ons and surface detail of the shoulder screws shall be in accordance with Figure 1 and Table 1. BS4168-7:1982 2 BSI 07-1999 NOTEFor broached sockets which are at the maximum limit of size, the overcut resulting from drilling shall not exceed 20% of the length of any flat of the socket. Figure 1 Shou
21、lder screwsBS 4168-7:1982 BSI 07-1999 3 Table 1 Dimensions Dimensions in millimetres nominal 6 8 10 12 16 20 24 d s max. 5.990 7.987 9.987 11.984 15.984 19.980 23.980 min. 5.960 7.951 9.951 11.941 15.941 19.928 23.928 d M5 M6 M8 M10 M12 M16 M20 P a 0.8 1 1.25 1.5 1.75 2 2.5 b max. 9.75 11.25 13.25 1
22、6.40 18.40 22.40 27.40 min. 9.25 10.75 12.75 15.60 17.60 21.60 26.60 max. b 10 13 16 18 24 30 36 d k max. c 10.22 13.27 16.27 18.27 24.33 30.33 36.39 min. 9.78 12.73 15.73 17.73 23.67 29.67 35.61 d g,1 min. 5.42 7.42 9.42 11.42 15.42 19.42 23.42 d g,2 max. 3.86 4.58 6.25 7.91 9.57 13.23 16.57 min. 3
23、.68 4.40 6.03 7.69 9.35 12.96 16.30 d a,1 max. 6.8 9.2 11.2 14.2 18.2 22.4 26.4 d a,2 max. 5 6 8 10 12 16 20 e min. d 3.44 4.58 5.72 6.86 9.15 11.43 13.72 k max. 4.5 5.5 7 9 11 14 16 min. 4.32 5.32 6.78 8.78 10.73 13.73 15.73 g 1 max. 2.5 2.5 2.5 2.5 2.5 2.5 3 g 2 max. 2 2.5 3.1 3.7 4.4 5 6.3 r 1 mi
24、n. 0.25 0.4 0.4 0.6 0.6 0.8 0.8 r 2 min. 0.5 0.53 0.64 0.77 0.87 1.14 1.38 nominal 3 4 5 6 8 10 12 s min. 3.02 4.02 5.02 6.02 8.025 10.025 12.032 max. 3.08 4.095 5.095 6.095 8.115 10.115 12.142 t min. 2.4 3.3 4.2 4.9 6.6 8.8 10 w min. 1 1.15 1.6 1.8 2 3.2 2.25 d w min. 9.38 12.33 15.33 17.23 23.17 2
25、8.87 34.61 l nominal min. max. 10 10 10.25 12 12 12.25 16 16 16.25 20 20 20.25 range 25 25 25.25 30 30 30.25 40 40 40.25 of 50 50 50.25 60 60 60.25 70 70 70.25 80 80 80.25 popular 90 90 90.25 100 100 100.25 lengths 120 120 120.25 a P is the pitch of the thread. b For plain heads. c For knurled heads
26、. d e min. = 1.14s min.BS4168-7:1982 4 BSI 07-1999 4 Tolerances of form and position The concentricity, perpendicularity and straightness tolerances shall be in accordance with Figure 2. d s Tolerances (in mm) Straightness tolerance (tolerance Z) Concentricity Perpendicularity For d su 8 For d s 8 A
27、 B C X Y 0.002L +0.05mm 0.0025L +0.05mm 6 0.44 0.36 0.12 0.15 0.15 8 0.54 0.44 0.12 0.18 0.15 10 0.54 0.44 0.12 0.24 0.15 12 0.54 0.54 0.12 0.27 0.15 16 0.66 0.54 0.14 0.34 0.20 20 0.66 0.66 0.14 0.42 0.20 24 0.78 0.66 0.17 0.50 0.30 Figure 2 Tolerances of form and positionBS 4168-7:1982 BSI 07-1999
28、 5 5 Specifications and reference standards The shoulder screws shall be manufactured in accordance with the specifications in Table 2 and the relevant reference standards as noted. Table 2 Specifications and reference standards 6 Designation When designating shoulder screws, for the purpose of an e
29、nquiry or order, the information as the following example shall be given. Hexagon socket shoulder screw with a shoulder diameter d s= 10mm (thread diameter d = M8) and nominal length l=40mm: Hexagon socket shoulder screw BS416810 40. Material Steel Thread Tolerances 5g6g British Standard BS3643 Mech
30、anical properties Class 12.9 a British Standard BS6104-1 Tolerances Product grade A British Standard BS6322-1 Discontinuities (threads only) BS . . . . b Finish Shoulder To surface roughness of R avalue0.84m in accordance with BS1134 and BS308-2. Tolerances only apply before electroplating. Other fe
31、atures Black oxide (thermal or chemical). Requirements for electroplating are covered in BS3382. If different electroplating requirements are desired or if requirements are needed for other finishes, they should be negotiated between customer and supplier. Acceptability For acceptance procedure seeB
32、S6587 b a Because of their configuration these screws cannot be subjected to tensile testing. They are nevertheless required to meet all the other material and property requirements for property class12.9 in BS6104-1. b Waiting the publication of ISO6157/3.6 blankBS 4168-7:1982 BSI 07-1999 Publicati
33、ons referred to BS308, Engineering drawing practice. BS308-2, Dimensioning and tolerancing of size. BS1134, Method for the assessment of surface texture. BS3382, Electroplated coatings on threaded components. BS3643, ISO metric screw threads. BS6104, Mechanical properties of fasteners. BS6104-1, Spe
34、cification for bolts, screws and studs. BS6322, Tolerances for fasteners. BS6322-1, Specification for tolerances of bolts, screws and nuts with thread diameters W 1.6mm andu 150mm and product grades A, B and C. BS6587, Method of acceptance inspection for fasteners. BS4168-7: 1982 BSI 389 Chiswick Hi
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