BS1768 STANDARD PDF

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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The nut shall satisfactorily resist this load without stripping and should be removable by the fingers after the test. Mechanical properties relating to steels specified in BS bs17688 for steels subjected to bulk heat treatment; significantly higher properties will be obtained by heat treatment in the finished component form. The Izod impact test on metals.

BS 1768-1963 Unified hexagon head screws, washer faced

Revisions British Standards are updated by amendment or revision. 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. In order to provide for the different methods of manufacture by which bolts, screws and nuts to this standard may be produced, a choice of materials is given.

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 Bs7168 industry Printing, paper and stationery Road engineering Shipbuilding Textiles and clothing Welding Licensed Copy: The tensile test on a bolt or screw shall be carried out as follows: The tensile strength and the proof stress shall be determined by the methods of test described in Clause 5.

Area, but elongation values appropriate to this length are not yet available for the higher grades of steel. A hardness test on bolts and screws is not part of the requirements of this standard, but Brinell hardness values are given for guidance in Table 4 of Appendix A.

If permission is granted, the terms may standaed royalty payments or a licensing agreement. For widths across flats, widths across corners, and diameter of washer face, see Table 2.

BS Unified hexagon head screws, washer faced

Bolts, screws and nuts machined from bars. Carbon and low alloy steel. This is in accordance with the American Standards from which these sizes are derived.

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These nuts shall be capable of withstanding a proof load, vs1768 on the minimum tensile strength of Grade T Bolts, as laid down in Table 4, Column 2. Attention is drawn to the fact that these alternative methods of finishing the underside of bolt and screw heads and the lower face of nuts are associated both with the nominal size and the particular method of manufacture.

The nominal length of a bolt standare screw shall be the distance from the underside of the head to the extreme end of the shank including any chamfer or radius.

BS 统一精密六角螺栓、螺钉和螺母(UNC与UNF螺纹)规范_图文_百度文库

A circular recess in the upper surface of the head or, A line of contiguous circles indented on one or more of the flats of the hexagon and parallel to the axis of the bolt or screw. Gauges for screw threads of Unified form. These tolerances should cover both the width of slot and the off-centre distance. The screw threads may be either cut or rolled at the option of the manufacturer and shall conform to the limits and tolerances for Class 2A specified in BS BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards.

The internal diameter D of the sleeve equals the nominal diameter of the bolt or screw plus the concentricity tolerance. This shall be checked by means of a screwed plug gauge with appropriate slot and a plain plug gauge which shall be a Go gauge in the minimum slot see Figure 22 in Appendix C.

It presents the UK view on standards in Europe and at the international level. As a first step, two standards for hexagon bolts, screws and nuts were published: The bolts, screws and nuts shall be cleanly finished, sound and free from defects. Area; BS 18 now specifies a gauge length of 5. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies.

BSTable of approximate comparison of hardness scales.

The test shall be made on the end faces of the nuts. This will be indicated in the amendment table on the inside front cover. Various BSI electronic information services are also available which give details on all its products and services. If steel bolts, screws or nuts are required bright all over, the purchaser should state this in his enquiry and order. Table 7 — Examples of suitable material for cold forged bolts and screws The following table is for guidance only; grades of steel shown and ruling sections are not mandatory.

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The screw threads on bolts, screws and nuts in nominal sizes above 1 in shall be Unified coarse UNC in accordance with BS The last named method of identification is for use on washer-faced nuts only. A load axial with the mandrel and equal to the proof load for nuts specified in Table 6 shall be applied against the nut. Nuts suitable for use with Bolts Grade S.

Copyright Copyright subsists in all BSI publications. For bolts of strength Grade T and greater, the depth of decarburization, measured from the crest, shall not exceed 33 per cent of the height of the threads.

BS 1768:1963

When bolts and screws are made with rolled threads the lead formed at the end of the bolt by the thread rolling operation may be regarded as providing the necessary chamfer to bs168 end, no other machining operation being necessary, and the end shall be reasonably square with the centre line of the shank. This shall be checked by means of a screwed ring gauge with appropriate slot and a sttandard plug gauge which shall be a Go gauge in the minimum split-pin hole see Figure 21 in Appendix C.

Mechanical EN 25 EN 26 properties relating to steels specified in BS are for steels subjected to bulk heat treatment; significantly higher properties will be obtained by heat treatment in the finished component b1768.

Failure of the bolt or screw to enter the ring gauge or interference between the sleeve and bolt while engaging the ring gauge indicates excessive eccentricity between the thread and the body. In revising the standard, the bw1768 has been taken to deal more fully with material and manufacture.