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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NOTE The groove is approximately midway between the major diameter of the thread and the flats of the hexagon. An ordinary nut or its equivalent in the form of an adaptor shall be bs176 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 the head and to the nut or adaptor.

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BS 1768:1963

The screw threads on bolts, screws and nuts in nominal sizes above 1 in shall be Unified coarse UNC in accordance with BS Table 10 — Materials for nuts The following table is given for guidance only and the grades of steel listed here are not mandatory.

After the bolt or screw has been stressed in accordance with the provisions of i of this clause, its length shall again be measured. Screws shall gs1768 threaded to permit of a screw ring gauge being screwed by hand to within a distance from the stanard of the head not exceeding two and a half times the pitch for diameters standaard to and including 1 in and three and a half times the pitch for diameters over 1 in.

Cold forged bolts and screws. Revisions British Standards are updated by amendment or revision.

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. It should be mentioned that this extension of the Unified range is also in accordance with agreement reached with the U. If the threads of the mandrel are damaged sgandard the test the test shall be discarded.

b1768 The optional type shown in Figure 19 permits the use of different length sleeves to accommodate different bolt lengths.

Birnell Hardness Licensed Copy: The values in Column 4 have therefore been retained pending further information on this subject.

In revising the standard, the opportunity has been taken to deal more fully with material and manufacture. Nuts of diameters over 1 in shall be subjected to a hardness test and their hardness shall not be less than that specified below: When materials selected from this table are used, the mechanical properties referred to above are obtained by oil quenching and tempering at a suitable temperature. This plug also sets the ring gauge to the maximum effective diameter.


Except as permitted under the Copyright, Designs and Patents Act no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means — electronic, photocopying, recording or otherwise — without prior written permission from BSI.

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.

BS 1768-1963 Unified hexagon head screws, washer faced

Table 9 and Table 10 of Appendix B give a selection of steels from BS which are among those suitable for particular grades of bolts, screws and nuts. This shall be checked by means of a screwed ring gauge with appropriate slot and a plain plug gauge which shall be a Go gauge in the minimum split-pin hole see Figure 21 in Appendix C.

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. BSUnified screw threads — Parts 1 and 2: The former gauge length and its associated values have therefore been retained in this standard for the time being and a suitable amendment will be issued when the necessary information can be supplied.

Nuts suitable for use with Bolts Grade S. Cinematography and photography Coal, coke and colliery requisites Codes of Practice Consumer goods Documentation, including Universal Decimal Classification Drawing practice Electrical engineering Farming, dairying and allied interests Furniture, bedding and furnishings Gardening, horticulture and landscape work Gas and solid fuel and refractories Glassware including scientific apparatus Hospital equipment Illumination and lighting fittings Industrial instruments, etc.

Table 11 — Grade A bright hexagon bolts Licensed Copy: 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: This will be indicated in the amendment table on the inside front cover.

Steel precision bolts, screws and nuts are normally supplied with the following finishes: The Izod impact test on metals. The proportions of hexagons for bolts, screws and nuts in intermediate sizes and sizes larger than 2 in should be derived from the formulae extracted from the American Standard and given below.

NOTE The preferred method of carrying out this test is to measure the length between conical centres on the centre line of the bolt or screw which has been set up on the mating centres of the anvils of the measuring fixture; the head or shank of the bolt or screw should be marked so that it can be placed in the same position for all measurements. If the purchaser requires bolts, screws or nuts of steel or other material to be coated, he should state the type of coating required in his enquiry and order.


Carbon and low alloy steel. It presents the UK view on standards in Europe and at the international level.

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

The test shall be made on the end faces of the nuts. DATE, Uncontrolled Copy, c BSI The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following were directly represented on the Committee entrusted with the preparation of this standard: DATE, Uncontrolled Copy Table 1 — Unified hexagon head bolts and screws — Normal series 1 Nominal size D 2 3 4 5 6 7 8 Width across corners C 9 10 11 12 13 14 15 16 17 Drill sizes 18 Maximum off-centre distance between centre line of hole and thread in 0.

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 the end, no other machining operation being necessary, and the end shall be reasonably square with the centre line of the shank. 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.

If steel bolts, screws or nuts are required bright all over, the purchaser should state this in his enquiry and order.

For bolts of strength Grade T and greater, the depth of decarburization, measured sandard the crest, shall not exceed 33 per cent of the height of the threads. Measurement of the specimens subjected to the proof stresses for bolts or screws shall be performed in the following manner: Complete freedom from any decarburization is achieved by shank grinding after heat treatment and before thread rolling; if this is required, it shall be the subject of negotiation between manufacturer and user.

BSI Licensed Copy: The permissible tolerance on the nominal length shall be as given below: These tolerances should cover both the width of slot and the off-centre distance.

The internal diameter D of the sleeve equals the nominal diameter of the bolt or screw plus the concentricity tolerance. NOTE It is considered that the range of nominal sizes included in this standard is adequate for most of the applications for which this series is likely to be employed, but for the convenience of users requiring larger sizes, the formulae from which the proportions for bolt heads and nuts are derived are given in Appendix F.