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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These may be bright on all surfaces or dull black where heat treated. A circular groove of semi-circular section indented in the non-bearing face, or A line of standagd circles indented on one or more of the flats of the hexagon and parallel to the axis of the nut, or A recess in the non-bearing face of the nut.

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Cold forged bolts stadard screws. For nuts up to and including 1 in diameter, a hardness ztandard is not part of the requirements of this standard but for general guidance Brinell hardness values are given below: 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 lap formed at the crest of the thread perpendicular to the axis of the bolt shall not be considered a cause stanfard rejection if the depth of the lap does not exceed 33 per cent of the depth of the thread.

BSI Licensed Copy: For highly stressed bolt applications, the definition and degree of such decarburization shall be bs176 between manufacturer and user.

The purchaser should state, in his enquiry and order, Dimension J see Figure 1. Bolts, screws and nuts produced by hot forging standafd by turning from bars, and cold formed nuts shall be heat-treated when this is necessary to give the requisite mechanical properties specified in Clauses 4 and 6 and Appendix A.

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The Izod impact test on metals. The nut shall satisfactorily resist this load without stripping and should be removable by the fingers after the test. This standard has been updated see copyright date and may have had amendments incorporated. The grips of the testing machine shall be self-aligning to avoid side thrust see Figure 16 in Appendix C. It is recognized that a transition period will necessarily ensue during which stocks of both grades will be held by manufacturers and either may be offered when bolts in this tensile range are ordered.


The bolt or screw shall be placed in a suitable testing machine with the threaded end of the bolt or screw in a threaded grip or in a nut. The sleeve should extend beyond the last thread of the bolt or screw to be inspected but should not exceed 3 inches in length. The finished products shall satisfy the requirements for physical properties set out in Clause 4 and Table 4 of Appendix A.

Nominal length in Diameter in Tolerance of length in 3 b. If permission is granted, the terms may include royalty payments or a licensing agreement.

Sttandard 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.

BS 1768-1963 Unified hexagon head screws, washer faced

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 standad treatment in the finished component form. The proof stress for bolts shall be determined as follows: 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 1 in diameter and under. NOTE The groove is approximately midway between the major diameter of the thread and the flats of the hexagon.

Appendix C of BS Mechanical properties are given only in respect of steel bolts, screws and nuts, and the finishes in which they are bs1678 supplied are described in Clause 3. 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 stnadard, Column 2.

BS 1768:1963

Area, but elongation values appropriate to this length are not yet stabdard for the higher grades of steel. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies.

These nuts shall be capable of withstanding a proof load, based standarf the minimum tensile strength of Grade T Bolts, as laid down in Table 4, Column 2.

BSScrew gauge limits and tolerances — Part 1: Revisions British Standards are updated by amendment or revision.

BS Unified hexagon head screws, washer faced

Unless otherwise stipulated by the purchaser, the choice of material shall be left to the manufacturer provided that the finished products satisfy the requirements for mechanical properties set out in Clauses 4 and 6 and in Table 4 and Table 6 of Appendix A. Compliance with a British Standard does not of itself confer immunity from legal obligations. The tensile strength and the proof stress shall be determined by the methods of test described in Clause 5.


Up to and including 2 in a Limiting ruling section. The nominal length of a bolt or screw shall be the distance from the underside of the head to the extreme end of the shank including any chamfer or radius.

The test shall be made on the end faces of the nuts. 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. Area; BS 18 now specifies a gauge length of 5. 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.

Copyright Copyright subsists in all BSI publications. The tensile test on a bolt or screw shall be carried out as follows: Various BSI electronic information services are also available which give details on all its products and services. If, however, the purchaser wishes to specify the composition of the material to be used, this shall be the subject of agreement with the manufacturer.

Area, but values appropriate to this length are not yet available for the higher grades of steel. BSSplit cotter pins. 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. The bolt or screw 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.

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.

This will be indicated in the amendment table on the inside front cover.