BRITISH STANDARD BS 7419:1991 Specification for Holding down bolts BS7419:1991 This British Standard, having been prepared under the directionof the General Mechanical Engineering Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 29March1991 © BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference GME/9 Draft for comment 90/75944 DC ISBN 0 580 19403 5 Committees responsible for this BritishStandard The preparation of this British Standard was entrusted by the General Mechanical Engineering Standards Policy Committee (GME/-) to Technical Committee GME/9, upon which the following bodies were represented: BEAMA Ltd British Constructional Steelwork Association Ltd British Industrial Fasteners Federation British Railways Board British Steel Industry British Steel Industry (Wire Section) Gauge and Tool Makers’ Association Ministry of Defence Society of Motor Manufacturers and Traders Limited Washer Manufacturers’ Association of Great Britain The following body was also represented in the drafting of the standard, through subcommittees and panels: Steel Construction Institute Amendments issued since publication Amd. No. Date Comments BS7419:1991 © BSI 12-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Dimensions 1 3 Characteristics 6 4 Complete designation for the purpose of an enquiry or order 6 Figure 1 — Dimensions of square head bolts 3 Figure 2 — Dimensions of hexagon head bolts 5 Table 1 — Dimensions of square head bolts 2 Table 2 — Dimensions of hexagon head bolts 4 Table 3 — Tolerance on nominal length 6 Table 4 — Preferred sizes 6 Table 5 — Characteristics 6 Publication(s) referred to Inside back cover BS7419:1991 ii © BSI 12-1999 Foreword This British Standard has been prepared under the authority of the General Mechanical Engineering Standards Policy Committee to provide a metric series standard for holding down bolts. 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, pagesi andii, pages1 to6, 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. BS7419:1991 © BSI 12-1999 1 1 Scope This British Standard specifies the general dimensions, tolerances, materials and mechanical properties for holding down bolts of product grade C for use in connecting steel structures to their foundations and in similar applications. 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. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Dimensions The general dimensions and tolerances of holding down bolts with square heads and square necks shall be as given inTable 1 andTable 3, and Figure 1. The dimensions and tolerances of holding down bolts with hexagon heads shall be as given in Table 2andTable 3,andFigure 2. NOTE 1Preferred sizes for square and hexagon head holding down bolts are listed inTable 4. NOTE 2Symbols and descriptions of dimensions may be found in BS 6565. The symbol v is the dimension across flats of the underhead square neck. BS 7419 : 1991 2 © BSI 12-1999 Table 1 — Dimensions of square head bolts Thread (d) M16 M20 M24 M30 M36 M42 M48 M56 M64 P (pitch) 2 2.5 3 3.5 4 4.5 5 5.5 6 b max. 122 127.5 133 140.5 148 155.5 163 172.5 182 min. 116 120 124 130 136 142 148 156 164 d s max. 16.7 20.84 24.84 30.84 37 43 49 57.2 65.2 min. 15.3 19.16 23.16 29.16 35 41 47 54.8 62.8 k nom. 10 12.5 15 18.7 22.5 26 30 35 40 min. 9.25 11.6 14.1 17.65 21.45 24.95 28.95 33.75 38.75 max. 10.75 13.4 15.9 19.75 23.55 27.05 31.05 36.25 41.25 r min. 0.6 0.8 0.8 1 1 1.2 1.6 2 2 s nom. = max. 24 30 36 46 55 65 75 85 95 min. 23.16 29.16 35 45 53.8 63.1 73.1 82.8 92.8 f nom. 8 10 12 15 18 21 24 28 32 min. 7.25 9.25 11.1 14.1 17.1 19.95 22.95 26.95 30.75 max. 8.75 10.75 12.9 15.9 18.9 22.05 25.05 29.05 33.25 v max. 16.7 20.84 24.84 30.84 37 43 49 57.2 65.2 min. 15.3 19.16 23.16 29.16 35 41 47 54.8 62.8 x max. 5 6.3 7.5 9 10 11 12.5 14 15 NOTEDimensions are in millimetres. BS 7419 : 1991 © BSI 12-1999 3 1) Incomplete threads, u k 2p. Figure 1 — Dimensions of square head bolts BS 7419 : 1991 4 © BSI 12-1999 Table 2 — Dimensions of hexagon head bolts Thread (d) M16 M20 M24 M30 M36 M42 M48 M56 M64 P (pitch) 2 2.5 3 3.5 4 4.5 5 5.5 6 b max. 122 127.5 133 140.5 148 155.5 163 172.5 182 min. 116 120 124 130 136 142 148 156 164 c max. 0.8 0.8 0.8 0.8 0.8 1 1 1 1 d a max. 18.7 24.4 28.4 35.4 42.4 48.6 56.6 67 75 d s max. 16.7 20.84 24.84 30.84 37 43 49 57.2 65.2 min. 15.3 19.16 23.16 29.16 35 41 47 54.8 62.8 d w min. 22 27.7 33.25 42.75 51.11 59.95 69.45 78.66 88.16 e min. 26.17 32.95 39.55 50.85 60.79 71.3 82.6 93.56 104.86 k nom. 10 12.5 15 18.7 22.5 26 30 35 40 min. 9.25 11.6 14.1 17.65 21.45 24.95 28.95 33.75 38.75 max. 10.75 13.4 15.9 19.75 23.55 27.05 31.05 36.25 41.25 r min. 0.6 0.8 0.8 1 1 1.2 1.6 2 2 s nom. = max. 24 30 36 46 55 65 75 85 95 min. 23.16 29.16 35 45 53.8 63.1 73.1 82.8 92.8 x max. 5 6.3 7.5 9 10 11 12.5 14 15 NOTEDimensions are in millimetres. BS 7419 : 1991 © BSI 12-1999 5 1) Incomplete threads, u k 2p. Dimension is in millimetres. Figure 2 — Dimensions of hexagon head bolts BS7419:1991 6 © BSI 12-1999 Table 3 — Tolerance on nominal length l Table 4 — Preferred sizes 3 Characteristics Materials, tolerances, mechanical properties and associated nuts for holding down bolts shall be as given inTable 5. 4 Complete designation for the purpose of an enquiry or order When designating for the purpose of an enquiry or order, the following information shall be given: a) general product description, i.e. Holding down bolts; b) head form, i.e. Square square, or Hexagon; c) the letter “M” indicating that the product is ISO metric; d) the nominal size (thread diameter) of the product in millimetres; e) the nominal length in millimetres; f) the strength grade; g) the number of this British Standard, i.e.BS7419; h) details of the associated nut in accordance with the appropriate British Standard, i.e. BS4190, BS3962 or BS4395-1; i) details of the coating (if required), in accordance with the appropriate British Standard (e.g. BS729, BS1706, BS4921). Examples: Square head holding down bolts20mm in diameter,450mm long, strength grade4.6with nuts to BS4190 would be designated: 1) Holding down bolts, Square square M20× 450, 4.6 to BS7419, nuts to BS4190. Hexagon head pre-loaded holding down bolts24mm in diameter, 600mm long, strength grade 8.8, nuts to BS4395-1, galvanized would be designated: 2) Pre-loaded holding down bolts, Hexagon M24× 600, 8.8 to BS7419, nuts to BS4395-1, galvanized to BS729. Table 5 — Characteristics Nominal length Tolerance mm mm 250 k l k 315 ± 5.20 315 < l k 400 ± 5.70 400 <l k 500 ± 6.30 500 <l k 625 ± 6.80 625 <l k 800 ± 7.20 800 <l k 1 000 ± 7.40 1 000 <l k 1 250 ± 7.60 Nominal length l for thread (d): M16 M20 M24 M30 M36 mm mm mm mm mm 300 300 — — — 375 375 375 — — 450 450 450 450 450 525 525 525 525 525 600 600 600 600 600 — 750 750 750 750 — 1 000 1 000 1 000 1 000 — — 1 250 1 250 1 250 Material Steel Thread tolerance 8g (seeBS 3643-1 and BS 3643-2) Mechanical property class a d k 39mm: 4.6, 8.82) (see BS6104-1) d >39mm: as agreed Tolerance (for product grade C) See BS6322-1 Finish a) as processed b) galvanized to BS1706 c) sherardized to BS4921 d) electroplated to BS1706 Acceptability For acceptance procedure, see BS6587 Associated nuts b See BS4190 or BS3692 a The designation symbol for the property classes according to BS 6104-1 can also be used for thread sizes above M39, provided that the finished product has all the properties assigned to the designation symbols in BS 6104-1. b When bolts of property class 8.8 are to be preloaded, nuts and hardened washers in accordance with BS4395-1 should be specified. 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Specification for ISO metric black hexagon bolts, screws and nuts BS 4395, Specification for high strength friction grip bolts and associated nuts and washers for structural engineering BS 4395-1, General grade BS 4921, Specification for sherardized coatings on iron or steel BS 6104, Mechanical properties of fasteners BS 6104-1, Specification for bolts, screws and studs BS 6322, Tolerances for fasteners... 729, Specification for hot dip galvanized coatings on iron and steel articles BS 1706, Method for specifying electroplated coatings of zinc and cadmium on iron and steel BS 3643, ISO metric screw threads BS 3643-1, Principles and basic data BS 3643-2, Specification for selected limits of size BS 3692, Specification for ISO metric precision hexagon bolts, screws and nuts Metric units BS 4190, Specification. .. fasteners BS 6322-1, Specification for tolerances for bolts, screws and nuts with thread diameters U 1.6 mm and k 150 mm and product grades A, B and C BS 6565, Method for dimensioning and designating bolts, screws, studs and nuts BS 6587, Method of acceptance inspection for fasteners © BSI 12-1999 BS 7419:1991 BSI — British Standards Institution BSI is the independent national body responsible for preparing... response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service Various BSI electronic information services... 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BS 3643-2, Specification for selected limits of size. BS 3692, Specification for ISO metric precision hexagon bolts, screws and nuts. Metric units. BS 4190, Specification for ISO metric. 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. NOTEThe titles of the. and tolerances of holding down bolts with square heads and square necks shall be as given inTable 1 andTable 3, and Figure 1. The dimensions and tolerances of holding down bolts with hexagon