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 length of thread on bolts shall be the distance from the end of the bolt including any chamfer or radius to the leading face of a screw ring gauge which has been screwed as far as possible on to the bolt by hand.

When threads are produced by rolling, small laps are commonly present at the crests and are generally of a magnitude which is not detrimental to the performance of the bolt.

BSMethods of Brinell hardness test — Part 1: Birnell Hardness Licensed Copy: The groove shall not exceed 0. Where an Izod test is not practicable, a nicked fracture test may be substituted. NOTE The groove is approximately midway between the major diameter of the thread and the flats of the hexagon.

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.

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. Area, but values appropriate to this length are not yet available for the higher grades of steel. Nuts suitable for use with Bolts Grades V and X. Steel precision bolts, standqrd and nuts are normally supplied with the following finishes: The optional type shown stqndard Figure 19 permits the use of different length sleeves to accommodate different bolt lengths.

The overall length of the bolt standdard screw shall be measured at syandard true centre line with an instrument capable of measuring changes in length of 0. Appendix C of BS 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.

BS 1768-1963 Unified hexagon head screws, washer faced

The nut shall be screwed by hand on to a gauge having a truncated taper thread until the thread of the nut is tight on the thread of the gauge. This shall be checked by means of a screwed plug gauge with appropriate slot and a plain plug gauge which shall be a Go gauge in the minimum slot see Figure 22 in Appendix C.


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

The values in Column 4 have therefore been retained pending further information on this subject. Grade Nominal size of bolt or screwa Materialb Licensed Copy: BS 18, Methods for tensile testing of metals.

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BS Unified hexagon head screws, washer faced

Gauges for screw threads wtandard Unified form. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Laps in the flanks above the effective diameter shall not have a depth greater than 33 per cent of the thread depth.

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. Measurement of the specimens subjected to the proof stresses for bolts or screws shall be performed in the following manner: Complete freedom from any stadard 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 bss1768.

BS 1768:1963

Tolerances may be extrapolated from Table 1, Table 2 or Table 3 as appropriate. The nut shall satisfactorily resist this load without stripping and should be removable by the fingers after the test. For details of these and other benefits contact Membership Administration. A circular recess in the upper surface of the head or, A line of contiguous circles indented on one or more of the flats of the hexagon and parallel to the axis of the bolt or screw. BSMethods for notched bar tests — Part 1: 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.

BSTable of approximate comparison of hardness scales. Nominal length in Diameter in Tolerance of length in 3 b. 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.


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

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 comply with the requirements for physical properties as set out in Clause 4 and in Table 4 of Appendix A. Unless otherwise stipulated, the final choice of the materials used to give the physical properties specified for the finished nuts in Clause 6 and Table 6 will be left to the manufacturer.

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 is in accordance with the American Standard from which these sizes are derived.

These nuts shall meet the requirements for proof load specified in Table 6. Unless otherwise stipulated, the final choice of the materials used to provide the physical properties given in Appendix A will be left to the manufacturer see Clause 2. Minimum Izod impact value. When materials selected from this staneard are used, the mechanical properties referred to above are obtained by oil quenching and tempering at a suitable temperature.

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. 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 proof stress for bolts shall be determined as follows: Screws shall be stancard 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. BSStandadd gauge limits and tolerances — Part 1: They shall be tested in accordance with the method described in Clause 7. Gauging of screw threads.