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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This test is passed if the fracture originates in the threaded part even if the fracture extends into the fillet or head before separation. BS’ High strength friction grip bolts for structural enginaring ‘, Part 1, ‘ General grade bolts ‘. NOTE 2 Although the mechanical requirements specified in this standard are in metric technical units i. The demands on the Services of the Institution are steadily increasing and can only be met if continuing and increased financial Support is provided.

For washers the nominaldiarneter and type of washer e.

BS 4395-1:1969

The extension of the bolt shall be measured, at its true centre line, with a suitable instrument. BS 18, Methods for tensile testing of metals. System HV – 4395–1 bolt and nut assemblies Withdrawn. Figure 7 — Test piece B.

BS Metric high strength large hexagon head bolts

Scale 38 to 45 HRC. Hexagon head bolts with hexagon nut for steel structures Suppliers 1. System HR – countersunk head bolt and nut assemblies incorporating corrigendum October Withdrawn.

Click to learn more. The thread shall be tolerance class 4hexcept that the major diarneter shall be equal to bz minimurn bx diameter for class 4h with a plus tolerance of one quarter of the 6g major diameter tolerence. System HV – hexagon bolt and nut assemblies. High strength bolts for joints of space grid structures.


Recommended gauge for checking squareness of thread to face of nut 31 F. Number of pieces comprising a batch of bolts Tolerance on nominal length Thread lengths Mechanical properties of bolts Dimensions of hexagon head bolts Number of pieces comprising a batch of nuts Proof loads for nuts coarse pitch series Dimensions of hexagon nuts Number of pieces cornprising a batch of washers Dimensions of flat round washers Dimensions of square taper washers Dimensions for wedge loading test 9 10 11 13 14 15 17 18 19 21 22 28 FIGURES 1.


The bolt should meet the minimum tensile strength given in Table 4 before fracture occurs. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards.

Heavy Hex Head Configurations. 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. Before embarking on any project it must be satisfied that there is a strong body of opinion infavour of proceeding and thatthere is a recognized need to bc rnet. Table 9 — Number of pieces comprising a batch of washers Washers for bolt sizes Number of pieces in batch 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 4.

The dimensions of plain washers shall be in accordance with Table 10 Figure 5. 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.

Membership of theInstitution is opem to British subjects, companies, technical and trade associations. The standard thread lengths are based on the formulae set out in Table 3. Their committees work with the manufacturing and service industries, government, businesses and consumers to facilitate the production of British, European and International standards.


Part 2, ‘ Additional tables Tor SI conversions ‘. Standard nominal lengths and preferred sizes of ISO metric high strength friction grip bolts 33 general grade A. BSLimits and fits for engineering. Heavy Hex Bolts Suppliers 2. In carrying out its work the Institution endeavours to ensure adequate representation of all viewpoints.

Although it is appreciated that some of those sections 439-51 industry already using ISO inch Unified screw threads may find it necessary, for various reasons, to continue with their 43995-1 for some time, Whitworth and BA threads should be superseded by ISO metric threads in preference to an intermediate change to ISO inch threads. The manner in which tests are to be carried out is specified in Appendix B. The Standard nominal lengths are given in Appendix F, together with preferred size combinations of diameter and length.

Bolts that are too short for rninirnurn thread length shall be threaded as near to the head as possible, providing the radius specified in Table 5 is maintained. System HV-Hexagon bolt with large width across flats and nut assemblies. A batch shall consist of the number of pieces shown in Table 1.

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.

It also seems unlikely that a metric Version of BS 4 would in any wayChange 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.