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 bolts, screws and nuts shall be cleanly finished, sound and free from defects.

The screw threads shall conform to the limits and tolerances for Class 2B specified in BS Appendix C of BS 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. 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. 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.

Nuts of diameters over 1 in shall be subjected to a hardness test and their hardness shall not be less than that specified below: The tensile strength and the proof stress shall be determined by the methods of test described in Clause 5. Mechanical 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 form.

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. As normally manufactured from wire of ordinary quality, a proportion of threads produced on forged bolts and screws by rolling may have some surface decarburization principally at crests of threads.


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 internal diameter D of the sleeve equals the nominal diameter of the bolt or screw plus the concentricity tolerance. Assembly testing of nuts. Nuts 1 in diameter and under. Compliance with a British Standard does not of itself confer immunity from legal obligations.

BS Unified hexagon head screws, washer faced

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. Contact the Information Centre. Table 10 — Materials for nuts The following table is given for guidance only and the grades of steel listed here are not mandatory.

The screw threads on bolts, screws and nuts in nominal sizes above 1 in shall be Unified coarse UNC staandard accordance with BS These nuts shall be capable of withstanding a proof load, based on the standxrd tensile strength of Grade T Bolts, as laid down in Table 4, Column 2.

BS 1768:1963

BSI BS The choice of material used to manufacture bolts and screws by cold forging shall normally be at the discretion of the manufacturer. The Izod impact test on metals. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. They shall be tested in accordance with the standard procedure as given in BS These nuts shall be capable of withstanding a proof load, based on the minimum tensile strength of Grade X Bolts, as laid down in Table 4, Column 2.

BSUnified screw threads — Parts 1 and 2: This will be indicated in the amendment table on the inside front cover. Laps in the flanks above the effective diameter shall not have a depth greater than 33 per cent of the thread depth. It presents the UK view on standards in Europe and at the international level.


BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. They stamdard offered for guidance and do not form part of the requirements of this standard.

The surfaces of these bolts and screws are customarily dull black from heat treatment, although the standar may machine some of the surfaces of the larger size bolts and screws after heat treatment.

The proof stress for bolts shall be determined as follows: T Up to and including 2 in? The tensile test on a bolt or screw shall be carried out as follows: Bolts, screws and nuts machined from bars. 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.

BS 1768-1963 Unified hexagon head screws, washer faced

Up to and including 2 in a Limiting ruling section. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. It should be mentioned standad this extension of the Unified range is also in accordance with agreement reached with the U.

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.