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 proof stress for bolts shall be determined as follows: With the exception of slotted nuts, all hexagon nuts chamfered at both ends shall also have a countersink as above at both ends of the thread.
Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. A request by the purchaser for a specific type of finish limits the manufacturing processes available and it is therefore recommended that the purchaser avoids making such a request unless circumstances fully justify it.
The finished products shall satisfy the requirements for physical properties set out in Clause 4 and Table 4 of Appendix A. When BS was first issued inits publication marked an important stage in the development of the Unified screw thread system established in accordance with the agreement reached by the United Kingdom with the United States and Canada at the Ottawa Conference of and ratified by the Declaration of Accord signed by representatives of those three countries in November, BSSpecification for wrought stancard for mechanical and allied engineering purposes — Part 1: Nominal length in Diameter in Tolerance of length in 3 b.
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 standarrd not mandatory. See also Table 15 for shortest lengths designated as bolts.
BS 1768-1963 Unified hexagon head screws, washer faced
Figure 26 — Ordinary nut, thick nut, lock, slotted or thick slotted nut with indented circles? Bolts, screws and nuts produced by hot forging or by turning from stanxard, 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.
A load axial with the mandrel and equal to the proof load for nuts specified in Table 6 shall be applied against the nut. It presents the UK view on standards in Europe and at the international level.
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. The dimensional requirements of this standard apply both to ferrous and non-ferrous bolts, screws and nuts. The permissible tolerance on the nominal length shall be as given below: 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.
The purchaser should state, in his enquiry and order, Dimension J see Figure 1. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. 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.
They shall be tested in accordance with the standard procedure as given in BS Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services.
A lap formed at the crest of the thread perpendicular to the axis of the bolt shall not be considered a cause for rejection if the depth of the lap does not exceed 33 per cent of the depth of the thread.
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. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover.
The Izod impact test on metals. This is in accordance with the American Standards from which these sizes are derived.
Gauges for screw threads of Unified form. The surfaces of these bolts and screws are customarily dull black from heat treatment, although the manufacturer may machine some of the surfaces of the gs1768 size bolts and screws after heat treatment. Method of test see Figure 17 in Appendix C. BSI BS BSMethods for notched bar tests — Part 1: The tensile strength and the proof stress shall be determined by the methods of test described in Clause 5. Steel precision bolts, screws and nuts are normally supplied with the following finishes: It is incorporated by Royal Charter.
If permission is granted, the terms may include royalty payments or a licensing agreement. These nuts shall meet the requirements for proof load specified in Table 6. It was recognized at that time that effective adoption of the system depended very largely on the provision of commonly used types and sizes of fasteners, the general features of which would be unified as well as the threads. The screw threads gs1768 conform to the limits and tolerances for Class 2B specified in BS The ring Gauge A in this type is centred in position on sleeve B by means of positioning plug E and secured by means of attachment screws C.
For details of these and other benefits contact Membership Administration. NOTE The option referred to in sub-clauses a and b standdard shall apply unless the purchaser in his enquiry and order specifically states that he requires one of the alternatives available.
NOTE The preferred method of carrying out this test is to measure the length between conical centres on the vs1768 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.
BSTable of approximate comparison of hardness scales. These nuts shall be capable of withstanding a proof load, based on the minimum tensile strength of Grade T Bss1768, as laid down in Stadard 4, Column 2. The screw threads may bs7168 either cut or rolled at the option of the manufacturer and shall conform to the limits and tolerances for Class 2A specified in BS These may be bright on all surfaces or dull black where heat treated.
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. 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.
They are offered for guidance and do not form part of the requirements of this standard. If a finer thread is required on bolts, screws and nuts in nominal sizes above 1 shandard, it is recommended that the 8-thread series be used.
Nuts of diameters over 1 in shall be subjected to a hardness test and their hardness shall not be less than that specified below: This is in accordance with the American Standard from which these sizes are derived.
Sgandard 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. BSMethods of Brinell hardness test — Part 1: