Specification for Holding down bolts docx

BS 7419:1991This British Standard, having been prepared under the direction of the General Mechanical Engineering Standards Policy Committee, was published under the authority of t

BRITISH STANDARD BS 7419:1991

Specification for

Holding down bolts

BS 7419:1991

This British Standard, having

been prepared under the

direction of the General

Mechanical Engineering

Standards Policy Committee,

was published under the

authority of the Standards

Board and comes

into effect on

29 March 1991

© 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 British Standard

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

BS 7419:1991

Contents

Page

4 Complete designation for the purpose of an enquiry or order 6

BS 7419:1991

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, 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

BS 7419:1991

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

NOTE The 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 in Table 1 and Table 3, and Figure 1

The dimensions and tolerances of holding down bolts with hexagon heads shall be as given in Table 2 and Table 3, and Figure 2

NOTE 1 Preferred sizes for square and hexagon head holding down bolts are listed in Table 4.

NOTE 2 Symbols and descriptions of dimensions may be found

in BS 6565 The symbol v is the dimension across flats of the

underhead square neck.

Table 1 — Dimensions of square head bolts

NOTE Dimensions are in millimetres.

1) Incomplete threads, u k 2p.

Figure 1 — Dimensions of square head bolts

Table 2 — Dimensions of hexagon head bolts

NOTE Dimensions are in millimetres.

1) Incomplete threads, u k 2p.

Dimension is in millimetres.

Figure 2 — Dimensions of hexagon head bolts

BS 7419:1991

Table 4 — Preferred sizes

3 Characteristics

Materials, tolerances, mechanical properties and

associated nuts for holding down bolts shall be as

given in Table 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 BS 7419;

h) details of the associated nut in accordance with the appropriate British Standard, i.e BS 4190,

BS 3962 or BS 4395-1;

i) details of the coating (if required), in accordance with the appropriate British Standard (e.g BS 729, BS 1706, BS 4921)

Examples:

Square head holding down bolts 20 mm in diameter, 450 mm long, strength grade 4.6 with nuts to BS 4190 would be designated:

1) Holding down bolts, Square square M20 × 450, 4.6 to BS 7419, nuts to BS 4190 Hexagon head pre-loaded holding down bolts 24 mm in diameter, 600 mm long, strength grade 8.8, nuts to BS 4395-1, galvanized would be designated:

2) Pre-loaded holding down bolts, Hexagon M24 × 600, 8.8 to BS 7419, nuts to BS 4395-1, galvanized to BS 729

Table 5 — Characteristics

Nominal length Tolerance

1 000 < l k 1 250 ± 7.60

Nominal length l for thread (d):

M16 M20 M24 M30 M36

Thread tolerance 8g (see BS 3643-1 and BS 3643-2)

Mechanical property classa d k 39 mm: 4.6, 8.82) (see BS 6104-1)

d > 39 mm: as agreed

Tolerance (for product grade C) See BS 6322-1

b) galvanized to BS 1706 c) sherardized to BS 4921 d) electroplated to BS 1706

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 BS 4395-1 should be specified.

BS 7419:1991

© BSI 12-1999

Publication(s) referred to

BS 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 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

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

BS 7419:1991

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