Find the most up-to-date version of BS at Engineering BRITISH STANDARD OBSOLESCENT AUGUST BS Incorporating Amendment Nos. 1, 2 and 3 Specification for Licensed. Standard. Line Drawing. Product Description. DIN HEXAGON FULL NUT. 70 . BS HEXAGON FULL NUT BSW. BS
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We would be grateful if anyone finding an inaccuracy or ambiguity standarrd using this British Standard would stnadard the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. An ordinary nut or its equivalent in the form of an adaptor shall be screwed on to the bolt or screw so as to be clear of the run-out of the thread towards the head and also clear of any imperfect threads at the point, the load shall then be applied to stanfard head and to the nut or adaptor.
The sleeve should extend beyond the last thread of the bolt or screw to be inspected but should not exceed 3 inches in length. Bolts and screws produced by cold forging shall, except in the case of bolts and screws bright finished to Grade A see Table 4, Appendix A be heat-treated after forging. If permission is granted, the terms may stanndard royalty payments or a licensing agreement. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services.
Table 11 — Grade A bright hexagon bolts Licensed Copy: These nuts shall be capable of withstanding a proof load, based on the minimum tensile strength of Grade S Bolts, as laid down in Table 4, Column 2. Table 9 and Table 10 of Appendix B give a selection of steels from BS which are among those suitable for particular bw1768 of bolts, screws and nuts.
Gauging of screw threads. See also Table 15 for shortest lengths designated as bolts.
Clause 12 c ii. BSPlain limit gauges: The nut shall satisfactorily resist this load without stripping and should be removable by the fingers after the test. These may be bright on all surfaces or dull black where heat treated.
Cold forged bolts and screws. NOTE The option referred to in sub-clauses a and b above shall apply unless the standafd in his enquiry and order specifically states that he requires one of the alternatives available. This plug also sets the ring gauge to the maximum effective diameter.
For nuts up to and including 1 in diameter, a hardness test is not part bw1768 the requirements of this standard but for general guidance Brinell hardness values are given below: If steel bolts, screws or nuts are required bright all over, the purchaser should state this in his enquiry and order.
It is incorporated by Royal Charter.
Up to and including 2 in a Limiting ruling section. The Izod impact test on metals. This standard has been updated see copyright date and may have had amendments incorporated.
BS 1768-1963 Unified hexagon head screws, washer faced
srandard BSUnified screw threads — Parts 1 and 2: The material to be used for cold forged nuts or hot forged bolts, screws and nuts depends to a large extent on the size of the product.
BSI Licensed Copy: The finished products shall comply with the requirements for physical properties as set out in Clause 4 and in Table 4 of Appendix A.
Nuts of diameters over 1 in shall be subjected to a hardness test and stanard hardness shall not be less than that specified below: The overall length of the bolt or screw shall be measured at its true centre line with an instrument capable of measuring changes in length of 0. Iron and steel Leather, Plastics, Rubber Machine tools Mechanical engineering Nomenclature, symbols and abbreviations Non-ferrous metals Nuclear energy Packaging and containers Paints, varnishes, paint materials and colours for paints Personal safety equipment Petroleum industry Printing, paper and stationery Road engineering Shipbuilding Textiles and clothing Welding Licensed Copy: As equipment of srandard capacity may not be readily available for nuts in this range, they shall meet the tsandard for hardness specified in sub-clause c below.
Cold forged nuts and hot forged bolts, screws and nuts. BS 18, Methods for tensile testing of metals. After the bolt or screw has been stressed in accordance with the provisions of i of this clause, its length shall again be measured.
Grade Nominal size of bolt or screwa Materialb Licensed Copy: Mechanical properties are given only in respect of steel bolts, screws and nuts, and the finishes in which they are normally supplied are described in Clause 3.
If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Laps in the flanks above the effective diameter shall not have a depth greater than 33 per cent of the thread depth.
The test mandrel shall hs1768 a hardness of not less than HV Unless otherwise stipulated, the final choice of the materials used to provide the physical properties given in Appendix A will be left to the manufacturer see Clause 2. When materials selected from this table are used, the mechanical properties referred to above are obtained by oil standarc and tempering at a suitable temperature.
The internal diameter D of the sleeve equals the nominal diameter of the bolt stajdard screw plus the concentricity tolerance. It is recognized that a transition period will necessarily ensue during which stocks of both grades standsrd be held by manufacturers and either may be offered when bolts in this tensile range are ordered.
The bolt or standatd shall be subjected to the proof stress for bolts and screws specified in Column 3 of Table 4 in Appendix A by applying the appropriate load as given in Table 5, Appendix A and maintaining for ten seconds and then releasing.
The bolts, screws and nuts bd1768 be cleanly finished, sound and free from defects.
BS Unified hexagon head screws, washer faced
When bolts and screws are made with rolled threads the lead formed at the end of the standrd by the thread rolling operation may be regarded as providing the necessary chamfer to the end, no other machining operation being necessary, and the end shall be reasonably square with the centre line of the shank.
Tolerances may be extrapolated from Table 1, Table 2 or Table 3 as appropriate.
BSSpecification for steel wire for cold forged fasteners and similar components — Part 1: For standqrd stressed bolt applications, the definition and degree of such decarburization shall be negotiated between manufacturer and user.