BS1768 STANDARD PDF

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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For nuts up to and stajdard 1 in diameter, a hardness test is not part of the requirements of this standard but for general guidance Brinell hardness values are given below: If steel bolts, screws or nuts are required bright all over, the purchaser standatd state this in his enquiry and order.

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. It is incorporated by Royal Charter. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards.

T Up to and including 2 in? Minimum Izod impact value. The material bs1678 be used for cold forged nuts or hot forged bolts, screws and nuts depends to a large extent on the size of the product.

As equipment of sufficient capacity may not be readily available for nuts in this range, they shall meet the requirements for gs1768 specified in sub-clause c below. NOTE The option referred to in sub-clauses a and b above shall apply unless the purchaser in his enquiry and order specifically states that he requires one of the alternatives available.

Bolts of Grades T, V and X shall be free from laps in the thread flank below the effective diameter. The internal diameter D of the sleeve equals the nominal diameter of the bss1768 or screw plus the concentricity tolerance.

Iron and steel Leather, Plastics, Rubber Machine tools Mechanical engineering Nomenclature, symbols and abbreviations Non-ferrous metals Nuclear energy Packaging and containers Paints, varnishes, paint materials and colours for paints Personal safety equipment Petroleum industry Printing, paper and stationery Road engineering Shipbuilding Textiles and clothing Welding Licensed Copy: This will be indicated in the amendment table on the inside front cover.

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 screw threads shall conform to the limits and tolerances for Class 2B specified in BS They shall be tested in accordance with the method described in Clause 7.

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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. 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 half times the pitch for diameters over 1 in.

Stabdard 12 c ii. As a first step, two standards for hexagon bolts, screws and nuts were published: The tensile strength and the proof stress shall be determined by the methods of test described in Clause 5.

BS 1768-1963 Unified hexagon head screws, washer faced

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 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 The test shall be made on the end faces of the nuts.

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.

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

BS Unified hexagon head screws, washer faced

The proof stress for bolts or screws shall be determined with a straight full size threaded bolt or screw. In addition to specifying materials for cold forged bolts, screws and nuts and offering guidance in the selection of materials for those produced by other methods, the standard now includes full details staneard the tests to be employed for determining the mechanical properties of the fasteners.

After the bolt or screw has been stressed in accordance with the provisions of i of this clause, its length shall again be measured.

BS was restricted at that time to sizes up to and including 1 inch but the many requests received for an extension stanadrd the standard have long indicated that this range was inadequate for the needs of industry and this edition accordingly provides for sizes up to and including 2 inches. This term is used to describe dtandard and screws which are machined on all surfaces or which have a finish on the hexagons produced by bright drawing and regarded as a bs7168 finish.

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Tensile strength and proof stress. They are offered for guidance and do not form part of the requirements of this standard. DATE, Uncontrolled Copy, c BSI The Government departments and scientific and stanfard 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: The purchaser should state, in his enquiry and order, Dimension J see Figure 1.

Bolts that are too short for minimum thread lengths shall be threaded as screws and shall be designated screws. BSMethods of Brinell hardness test — Part 1: Gauges for screw threads of Unified form. 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 are not mandatory.

BS 1768:1963

Bolts and screws produced by cold forging shall, except in the case of bolts and screws etandard finished to Grade A see Table 4, Appendix A be heat-treated after forging. 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 bs17688 negotiation between manufacturer and user. If the purchaser requires bolts, screws or nuts of steel or other material to be coated, he should state the type standad coating required in his enquiry and order.

These nuts shall be capable of withstanding a proof load, based on the minimum tensile strength of Grade T Bolts, as laid down in Table 4, Column 2. This shall be checked by means of a screwed plug gauge with appropriate slot and a plain plug gauge which ns1768 be a Go gauge in the minimum slot see Figure 22 in Appendix C.

BS 18, Methods for tensile testing of metals. The nuts shall be capable of withstanding a proof load, based on the minimum tensile strength stabdard Grade P Bolts, as laid down in Table 4, Column 2. BSScrew gauge limits and tolerances — Part 1: 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.