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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This term is used to describe bolts and screws which are machined on all surfaces or which have a finish on the hexagons produced by bright drawing and regarded as a machined finish. 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. 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 test shall be made on the end faces of the nuts. Mechanical properties are given only in respect of steel bolts, screws and nuts, and the finishes in which they are normally supplied are described in Clause 3. The tensile test on a bolt or screw shall be carried out as follows: Contact the Information Centre.

Bolts of Grades T, V and X shall be free from laps in the thread flank below the effective diameter. The permissible tolerance on the nominal length shall be as given below: BSUnified screw threads — Parts 1 and 2: A circular groove of semi-circular section indented in the non-bearing face, or A line of contiguous 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.

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

BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive bx1768 latest editions of standards. A lap formed at the crest of the staneard 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.

NOTE The groove is approximately midway between the major diameter of the thread and the flats of the hexagon.

Standaed nut shall satisfactorily resist this load without stripping and should be standwrd by the fingers after the test. The internal diameter D of the sleeve equals the nominal diameter of the bolt or screw plus the concentricity tolerance. DATE, Uncontrolled 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 manufacturer 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.


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.

The Izod impact test on metals. Gauging of screw threads.

BS 1768-1963 Unified hexagon head screws, washer faced

Screws shall be threaded to permit of a screw ring gauge being screwed by hand to within a distance from the underside of the head not exceeding two and a half times the pitch for diameters up to and including 1 in and three and a stqndard times the pitch for diameters over 1 in.

General inspection and testing standdard and specific requirement for carbon, carbon manganese, alloy and stainless steels. Minimum Izod impact value. Bolts and screws produced by cold forging shall, except in the case of bolts and screws bright finished to Grade A stzndard Table 4, Appendix A be heat-treated after forging.

Reference is also made to the control of decarburization and rolling laps. If permission is granted, the terms may include royalty payments or a licensing agreement. 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.

If the threads of the mandrel are damaged during the test the test shall be discarded. The screw threads may be either cut or rolled gs1768 the option of the manufacturer and shall conform to the limits and tolerances for Class 2A specified in BS For bolts of strength Grade T and greater, the depth of decarburization, measured from the crest, shall not exceed 33 per cent stanfard the height of the threads.

BS 1768:1963

BSScrew gauge limits and tolerances — Part 1: Method of test see Figure 17 in Appendix C. It presents the UK view on standards in Europe and at the international level.


Laps in the flanks above the effective diameter shall not have a depth greater than 33 per cent of the thread depth. They are offered for guidance and do not form part of the requirements of this standard. Mechanical properties relating to steels specified in BS are for steels subjected to bulk heat treatment; significantly higher properties will be bs7168 by heat treatment in the finished component form.

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 sfandard by heat treatment in the finished component form.

BS Unified hexagon head screws, washer faced

BSI BS The test mandrel shall have a hardness of not less than HV Bolts, screws and nuts can also be produced by machining from hexagon bars. These may be bright on all surfaces or dull black where heat treated. BSSpecification for steel wire for cold forged fasteners and similar components — Part 1: Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services.

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.

DATE, Uncontrolled Copy Table 3 — Unified hexagon slotted nuts and thick slotted nuts — Normal series 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Tolerance on squareness of thread to face of nut Max.

BSMethods of Brinell hardness test — Part 1: If a finer thread is required on bolts, screws and nuts in nominal sizes above 1 in, it is recommended that the 8-thread series be used. 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. 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: