BS Mechanical Properties of Fasteners Part 1: Bolts, Screws and Studs. BS , which was technically equivalent to ISO , is now ISO (upon which BS EN is based). BS (Square Square) Grade & Pitch of . a The designation symbol for the property classes according to BS ·1 can also be used for thread.
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Steel Construction Institute Amendments issued since publication Amd. A British Standard does not purport to include all the necessary provisions of a contract. 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 and ii, pages 1 to 6, an inside back cover and a back cover. 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. Bolts with square heads and square necks are specified. Two possible forms of square neck are covered. Bolts with hexagon heads are also specified. Other forms of holding down bolts are not covered. NOTE The titles of the publications referred to in this standard are listed on the inside back cover. The dimensions and tolerances of holding down bolts with hexagon heads shall be as given in Table 2 and Table 3, and Figure 2.
The symbol v is the dimension across flats of the underhead square neck. Figure 1 — Dimensions of square head bolts www. Dimension is in millimetres. Figure 2 — Dimensions of hexagon head bolts www. Holding down bolts; b head form, i.
BS ; h details of the associated nut in accordance with the appropriate British Standard, i. Square head holding down bolts 20 mm in diameter, mm long, strength grade 4. Hexagon head pre-loaded holding down bolts 24 mm in diameter, mm long, strength grade 8.
M16 M20 M24 M30 M36 mm mm mm mm mm — — — — — — — 1 1 1 1 — — 1 1 1 Material Steel Thread tolerance 8g see BS and BS Mechanical property classa d k 39 mm: BSMethod for specifying electroplated coatings of zinc and cadmium on iron and steel. BSISO metric screw threads.
BSPrinciples and basic data. BSSpecification for selected limits of size. BSSpecification for high strength friction grip bolts and associated nuts and washers for structural engineering. BSGeneral grade. BSSpecification for sherardized coatings on iron or steel. BSMechanical properties of fasteners. BSSpecification for bolts, screws and studs. BSTolerances for fasteners. BSSpecification for tolerances for bolts, screws and nuts with thread diameters U 1.
BSMethod for dimensioning and designating bolts, screws, studs and nuts. BSMethod of acceptance inspection for fasteners. It presents the UK view on standards in Europe and at the international level.
It is incorporated by Royal Charter. Revisions British Standards are updated by 604-1 or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using bss British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover.
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BS – Mechanical properties of fasteners. Specification for bolts, screws and studs
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