BS Metric high strength large hexagon head bolts 英标BS BS BS Metric high. Weight Calculator Tolerance. BS Specification For High Strength Friction Grip Bolts And Associated Nuts And Washers For Structural Engineering – General Grade. BS High strength friction grip bolts and associated nuts and washers for structural engineering. Metric series. General grade (AMD ) ( AMD.
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BS – Square BS – Bolts S BS SP Specifi General Grade UDC The Catalogue may be consulted in many public libraries and similar institutions.
This standard makes reference to the following British Standards: BS 18, Methods for tensile testing of metals. 439-51 21, Pipe threads. BSMethod for Brinell hardness test. BSTesting of metals. BSMethod for Vickers hardness test.
BSMethod for Rockwell hardness test. BSUnified screw threads. BSLimits and fits for engineering. BSISO metric screw threads. BSThread data and standard thread series.
BSLimits and tolerances for coarse pitch series threads. BS-1, General grade metric series. This British Standard has been prepared under the authority of the Mechanical Engineering Industry Standards Committee as a result of the decision taken to adopt the ISO metric screw thread system in the United Kingdom see Appendix Aand requests received from industry for the provision of a specification for high strength friction grip bolts to basic metric dimensions.
Although the basic hexagon sizes for the bolts and nuts are in accordance with ISO Recommendation Rthe next larger width across flats for any given diameter, as shown in the normal metric series, have been selected in order to provide greater bearing areas for both bolts and nuts. It also seems unlikely that a metric version of BS 4 would in any way change the flange angles, and there appears to be justification for retaining them as at present, since ISO is currently considering the adoption of structural steel sections covered by BS 4.
On the question of the material to be utilized for general grade bolts to Part 1 of this standard, the BSI committee responsible were unable to reconcile the different practices adopted on the continent, as detailed in ISO Draft Recommendation No.
It is continental practice to maintain a constant tensile strength throughout the diameter range of threaded products, thus necessitating a change in chemical composition because of the increase in ruling section, whereas it is the American practice to maintain a generally constant chemical composition, which in practice leads to a reduction in the tensile strength over the diameter range.
It was originally intended to specify ISO strength Grade 8. However, it was pointed out in committee that if ISO strength Grade 8. It was felt by the committee that economic considerations were important in this respect and might prove paramount for users intending to change over to metric products. This minor deviation was justified by the committee on the grounds that these products were not general purpose bolts and as such, it was felt desirable to specify a maximum transition diameter consistent with their specialized function.
NOTE 2 Although the mechanical requirements specified in this standard are in metric technical units i. For further information about SI units see PD Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.
Summary of pages This document comprises a front cover, an inside front cover, pages i to vi, pages 1 to 19 and a back cover.
BS Metric high strength large hexagon head bolts
This standard has been updated see copyright date and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.
Dimensions are given for a range of nominal sizes from 12 mm M 12 to 36 mm M 36 inclusive and mechanical properties are specified. Full details of tests, inspection procedure and provisions for marking are also included. NOTE Attention is drawn to the importance of ensuring that these bolts are correctly used if satisfactory results are to be obtained. Recommendations giving guidance in the use of this form of fastener are given in BS Any alternative method of use should be left to the responsibility of the engineer and should be noted on the appropriate drawings or documents, or both.
The manner in which tests are to be carried out is specified in Appendix B. If these tests are required, this should be clearly stated in the enquiry, order or contract. Each test selected from Appendix D shall be carried out three times per batch of bolts. A batch shall consist of the number of pieces shown in Table 1. Table 1 — Number of pieces comprising a batch of bolts Diameter of bolt d Number of pieces in batch 1. Up to and including 16 mm Over 16 mm up to and including 24 mm Over 24 mm 15 or fraction thereof 5 or fraction thereof 2 or fraction thereof 2 Bolts 2.
The maximum content of sulphur and phosphorus shall not exceed 0. In the case of the oxygen processes the maximum content of nitrogen shall not exceed 0. Should any specimen fail to meet the requirements of a specified test, an additional sample of double the number of specimens from the same batch at the time of manufacture shall be tested and if all the additional specimens satisfy the requirements of the test the batch shall be deemed to comply with this standard.
The nominal length of the bolt shall be the distance from the underside of the head to the extreme end of the shank, including any chamfer or radius. The standard nominal lengths are given in Appendix F, together with preferred size combinations of diameter and length. The tolerance on the nominal length shall be as given in Table 2.
They shall be hardened by quenching in oil or water and shall then be tempered. The form of thread, and diameters and associated pitches of general grade metric high strength friction grip bolts shall be in accordance with BS 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. The length of thread run out shall not exceed 2. The standard thread lengths are based on the formulae set out in Table 3.
Table 3 — Thread lengths Nominal length of bolt Length of threada 2. The tolerances on bolt thread lengths shall be plus two pitches for all diameters.
Bolts that are too short for minimum thread length shall be threaded as near to the head as possible, providing the radius specified in Table 5 is maintained.
The lower or bearing face shall be washer-faced. The bearing face shall be machined or have a surface equal to that produced by machining. The maximum and minimum diameters of the unthreaded portion of the shank of the bolt shall be in accordance with dimensions given in Table 5, Columns 2 and 3.
BS 4395-1-1969 Metric high strength large hexagon head bolts
The shank diameter shall be capable of acceptance by a ring gauge having an internal diameter equal to the maximum shank diameter as specified in Column 2, Table 5 and subject to a tolerance of plus 0.
A suitable design of gauge for this test would be a plain ring gauge having a maximum thickness equal to the nominal diameter of the bolt, a minimum fillet radius in the bore equal to the maximum radius under the bolt head and an internal diameter as specified above. Proof load see Note 4 min. NOTE 3 Based on Equivalent to stress at permanent set limit R0.
NOTE 4 Based on NOTE 5 Hardness values are given for guidance only. Only to be used for the lighter type of 43395-1 where practical conditions, such as material thickness, do not warrant the usage of a larger size bolt than M Figure 2 — Hexagon bolts Dimensions in millimetres 6 7 8 9 10 11 Depth of washer face c Min.
Width across corners e Max. Diameter 43995-1 washer face df Max. Radius under head 439-1 Thickness of head k Min. Free cutting steel shall not be used.
The form of thread and diameters and associated pitches for general grade metric high strength nuts shall be in accordance with BS The screw threads shall be made to the tolerances for medium class of fit 6H as specified in BS The bearing surface of the nut shall be machined or have a surface equal to that produced by machining. The bearing surface of the nut shall be square to the axis of the thread of the nut within the tolerances given in Column 11, Table 8.
A gauge recommended for carrying out this test together with the manner in which the test is to be undertaken is shown in Appendix E.
They shall be hardened by quenching in oil and shall then be tempered. If nuts of 30 mm diameter or over cannot be subjected to the proof load test, due to lack of suitable equipment, they shall be subject to a hardness test and their hardness shall not be outside the following ranges.
Three nuts shall be selected for the proof load or hardness test, as appropriate, from each batch of nuts at the time of manufacture. A batch shall consist of the number of pieces shown in Table 6. Table 6 — Number of pieces comprising a batch of nuts Diameter of nut Number of pieces in batch 3. Markings may be either embossed or indented at the option of the manufacturer, who may also use additional marking for his own 43995-1.
Up to and including 16 mm Over 16 mm up to and including 24 mm Over 24 mm 15 or fraction thereof 5 or fraction thereof 2 or fraction thereof 3.
Diameter of washer df Max. Thickness of nut m Min. Only to be used for the lighter type of construction where practical conditions such as material thickness do not warrant the usage of a larger size bolt than M The dimensions of plain washers shall be in accordance with Table 10 Figure 5.
The dimensions of square taper washers shall be in accordance with Table 11 Figure 6. When clearance makes it necessary, plain washers may be clipped on one side at a point not closer than seven-eighths of the bolt diameter from the centre of the washer. The hardness shall be as follows: Scale 38 to 45 HRC. Tapered washers shall be tested on the sheared edge to obtain a flat surface as specified in BS In this case a load of 30 kg shall be applied and the washers shall have a hardness 4395–1 to HV This projection vs be rounded to avoid sharp edges.
Three washers shall be selected for the hardness test from each batch of washers at the time of manufacture.