1、BRITISH STANDARD BS 4183:1967 Incorporating Amendment Nos. 1, 2 and 3 Specification for Machine screws and machine screw nuts metric series UDC 621.882:389.151BS4183:1967 This British Standard, having been approved by the MechanicalEngineering IndustryStandards Committee and endorsed by the Chairman
2、 ofthe Engineering Divisional Council, was publishedunder theauthority ofthe General Council on 19July1967 BSI 02-2000 The following BSI references relate to the work on this standard: Committee references MEE/60, MEE/60/2 Draft for comment 67/1778 ISBN 0 580 34578 5 Co-operating organizations The M
3、echanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Associated Offices Technical Committee Institution of Civil Engineers Ass
4、ociation of Consulting Engineers Institution of Gas Engineers Association of Mining Electrical and Institution of Heating and Ventilating Mechanical Engineers Engineers Board of Trade Institution of Mechanical Engineers British Chemical Plant Manufacturers Institution of Mechanical Engineers Associa
5、tion (Automobile Division) British Compressed Air Society Institution of Production Engineers* British Electrical and Allied Manufacturers Locomotive and Allied Manufacturers Association* Association of Great Britain* British Gear Manufacturers Association London Transport Board British Internal Com
6、bustion Engine Machine Tool Trades Association* Manufacturers Association Ministry of Defence British Iron and Steel Federation* Ministry of Labour (H.M. Factory Inspectorate) British Mechanical Engineering Federation Ministry of Power British Pump Manufacturers Association Ministry of Public Buildi
7、ng and Works Crown Agents for Oversea Governments and Ministry of Technology National Administrations Engineering Laboratory* Electricity Council, the Central Electricity Ministry of Transport Generating Board and the Area Boards in National Coal Board* in England and Wales* National Physical Labora
8、tory (Ministry Engineering Equipment Users Association of Technology) Gas Council* Radio Industry Council Institute of Marine Engineers Royal Institute of British Architects The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together wit
9、h the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Hydraulic Equipment Ministry of Defence, Navy Department Manufacturers Post Office British Railway Board Precision Bolt and Nut Institute British Constructional Steelwo
10、rk Association Rolled Thread Screw Association British Cycle and Motor Cycle Industries Scientific Instrument Manufacturers Association Ltd. Association Council of British Manufacturers of Petroleum Society of Motor Manufacturers and Equipment Traders Ltd. Electronic Engineering Association Telecomm
11、unication Engineering as illustrated below: 1/10 minimum tensile strength of40kgf/mm 2gives the symbol “4”. = “8”. Strength grade designation = “4.8”. Multiplication of these two figures gives the minimum yield stress inkgf/mm 2 . Screws and nuts to this standard are not normally subjected to test,
12、but where this is required the purchaser shall state so in his enquiry and order. 3.4 If the purchaser requires steel screws and nuts to be manufactured from material of a higher tensile strength, or from another material, this shall be subject to agreement between the purchaser and the supplier. 4
13、Coating of screws and nuts If the purchaser requires the screws or nuts to be coated, he shall state the coating required in his enquiry and order. It is recommended that the coating should comply with the appropriate part of BS3382 3) . 5 General dimensions 5.1 Screws. The general dimensions and to
14、lerances for screws shall be as given inTable 2 toTable 5 inclusive and Clause6 to Clause12 inclusive. 5.2 Nuts. The general dimensions and tolerances for nuts shall be as given inTable 8 and Clause7. 6 Heads of screws 6.1 The screw heads shall be concentric with the shank within tolerance grade IT1
15、3 using the head diameter as datum. SeeTable 6. 6.2 The slots and recesses shall be clean and free from burrs and shall be concentric with the head within tolerance grade IT13 using the head diameter as datum. SeeTable 6. 6.3 The depth of slot (dimension t) shall be measured from the top of the head
16、 to the point at which the slot breaks through. 6.4 The depth of the recess shall be such that when measured using the method and gauge described inAppendix A the penetration of the gauge into the recess conforms to the penetration values given inTable 2A,Table 3A andTable 4A. 7 Screw threads 7.1 Ge
17、neral. The screw threads shall be ISO metric coarse pitch series threads in accordance with BS3643-1 4) . 7.2 Screws. The external threads shall conform to tolerance Class6g limits (medium fit) as given in BS3643-2 4) . 7.3 Nuts. The internal threads shall conform to tolerance class6H limits (medium
18、 fit) as given in BS3643-2 4) . 8 Nominal length of screws 8.1 Countersunk head. The nominal length shall be the distance from the upper surface of the head to the extreme end of the shank, including any chamfer, radius, or cone point. 2) ISO 898/1 “Mechanical properties of fasteners”, Part1, “Bolts
19、, screws and studs”. 3) BS 3382, “Electroplated coatings on threaded components”. 4) BS 3643, “ISO metric screw threads”, Part 1, “Thread data and standard thread series”, Part 2, “Limits and tolerances for coarse pitch series threads”. 1/10 ratio yield stress minimum tensile strength -% 1 10 - 32 40 - 100 1 - =
