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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BS 1768-1963 Unified hexagon head screws, washer faced
In revising the standard, the opportunity has been taken to deal more fully with material and manufacture. Bolts that are too short for minimum thread lengths shall be threaded as screws and shall be designated screws.
Where an Izod test is not practicable, a nicked fracture test may be substituted. DATE, Uncontrolled Copy Table 1 — Unified hexagon head bolts and screws — Normal series 1 Nominal size D 2 3 4 5 stadnard 7 8 Width across corners C 9 10 11 12 13 14 15 16 17 Drill standdard 18 Maximum off-centre distance between centre line of hole and thread in 0.
Unless otherwise stipulated by the purchaser, the choice of material shall be left to the manufacturer provided that the finished products satisfy the requirements standdard mechanical properties set out in Clauses 4 and 6 and in Table 4 and Table 6 of Appendix A. 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.
The ztandard load for nuts shall be determined by assembling the sample nut on a hardened threaded mandrel as specified in sub-clause b below. Nuts suitable for use with Bolts Grade T.
When materials selected from this table are used, the mechanical properties referred to above are obtained by oil quenching and tempering at stanrard suitable temperature. Users of British Standards are responsible for their correct application. This is in accordance with the American Standard from which these sizes are derived.
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. These may be bright on all surfaces or dull black where heat treated.
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 bolt or screw shall be placed in a suitable testing machine with the threaded end of the bolt or screw in a threaded grip or in a nut.
NOTE The groove is approximately midway srandard the major diameter of the thread stadard the flats of the hexagon.
BS Unified hexagon head screws, washer faced
T Up to and including 2 in? The screw threads shall conform to the limits and tolerances for Class 2B specified in BS Bolts and screws produced by cold forging shall, except in the case atandard bolts and screws bright finished to Grade A see Table 4, Appendix A be heat-treated after forging.
The Izod impact test on metals. The internal diameter D of the sleeve equals the nominal diameter of the bolt or screw plus the concentricity tolerance. Nominal length in Diameter in Tolerance of length in 3 b. The nuts shall be capable of withstanding a proof load, based on the minimum tensile strength of Grade P Bolts, as laid down in Table 4, Column 2. This term is used to describe bolts and screws standafd are machined on all surfaces or which have a finish on the hexagons produced by bright drawing and regarded as a machined finish.
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. Nuts suitable for use with Bolts Grades V and X.
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 Figure 26 — Ordinary nut, thick nut, lock, slotted or thick slotted nut with indented circles? The dimensional requirements of this standard apply both to ferrous and non-ferrous bolts, screws and nuts.
Compliance with a British Standard does not of itself confer immunity from legal obligations. 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. The optional type shown in Figure 19 permits the use of different length sleeves to accommodate different bolt lengths. The proof stress for bolts shall be determined as follows: This will be indicated in the amendment table on the inside front cover.
The permissible tolerance on the nominal length shall be as given below: If the threads of the mandrel are damaged during the test the test shall be discarded. Users of British Standards should make sure that they possess the latest amendments or editions.
For highly stressed bolt applications, the definition and degree of such decarburization shall be negotiated between manufacturer and user.
Nuts shall be graded as follows: BS was restricted at that time to sizes up to and including 1 inch but the many requests received for an extension of 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. BS 18, Methods for tensile testing of metals. 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.