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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Nuts suitable for use with bolts, Grades A, B and P.

DATE, Staneard Copy, c BSI The manufacturer shall take the necessary steps to ensure that the requirements specified in this standard are fulfilled, but if, in addition, the purchaser desires the staneard to certify or demonstrate that the bolts, screws, and nuts comply with this standard, the details and cost of any further inspection entailed shall be the subject of agreement between the purchaser and the manufacturer.

BSMethods for notched bar tests — Part 1: The proof load for nuts shall be determined by assembling the sample nut on a hardened threaded mandrel as specified in sub-clause b below. This is in accordance with the American Standard from which these sizes are derived.

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.

Nuts suitable for use with Bolts Grade T.

BSI BS The nut shall be screwed by hand on to a gauge having a truncated taper thread until the thread stndard the nut is tight on the thread of the gauge. 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 former gauge length and its associated values have therefore been retained in this standard for be1768 time being and a suitable amendment will be issued when the necessary information can be supplied.

BS 1768-1963 Unified hexagon head screws, washer faced

The sleeve should extend beyond the last thread of the bolt or screw to be inspected but should not exceed 3 inches in length. 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: Details and advice can be obtained from the Copyright Manager.

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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. NOTE The groove is approximately midway between the major diameter of the thread and the flats of the hexagon. 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 BSPlain limit gauges: Bolts that are too short for minimum thread lengths shall be threaded as screws and shall be designated screws.

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.

A request by the purchaser for a specific type of finish limits the manufacturing processes available and bss1768 is therefore recommended that the purchaser avoids making such a request unless circumstances fully justify it.

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.

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. BSI Licensed Copy: General inspection and testing procedures and specific requirement for carbon, carbon manganese, alloy and stainless steels. The grips of the testing machine shall be self-aligning to avoid side thrust see Figure 16 in Appendix C. Bolts, screws and nuts can also be produced by machining from hexagon bars.

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

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. Unless otherwise stipulated, the final choice of the materials used to give the physical properties specified for the finished nuts stnadard Clause 6 and Table 6 will be left to the manufacturer. 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.


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.

Users of British Standards should make sure that they possess the latest amendments or editions.

See also Table 15 for shortest lengths designated as bolts. BSScrew gauge limits and tolerances — Part 1: 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 last named method of identification is for use on washer-faced nuts only. Table 10 — Materials for nuts The following table is given for guidance only and the grades of steel listed here are not mandatory. Area; BS 18 now specifies a gauge length of 5.

BS Unified hexagon head screws, washer faced

Reference is also made to the control of decarburization and rolling laps. This plug also sets the ring gauge to the maximum effective diameter. Nominal length in Diameter in Tolerance of length in 3 b. Bolts and screws produced by cold forging shall, except in the case of bolts and screws bright finished to Grade A see Table 4, Appendix A be heat-treated after forging.

BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Nuts of diameters over 1 in bw1768 be subjected to a hardness test and their hardness shall not be less than that specified below: For highly stressed bolt applications, the definition and degree of such decarburization shall be negotiated between manufacturer and user. Unless otherwise stipulated, the final choice of the materials used to provide dtandard physical properties given in Appendix A will be left to the manufacturer.

The permissible tolerance on the nominal length shall be as given below: Tensile strength and proof stress.