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  • BSI
    BS 4174:1972 Specification for self-tapping screws and metallic drive screws
    Edition: 1972
    $564.17
    / user per year

Description of BS 4174:1972 1972

This British Standard relates to ferrous and non-ferrous tapping screws and metallic drive screws.

Provisions are made for two classes of tapping screw, namely thread forming and thread cutting, each available in several types which are described and illustrated in the standard.

General dimensions are given for countersunk, raised countersunk, and pan head tapping screws with slotted or recessed heads, slotted mushroom heads, recessed flange heads and hexagon head tapping screws and round head metallic drive screws. Countersunk and raised countersunk head tapping screws in short lengths have shallower truncated heads than those in normal lengths and separate tables of dimensions are accordingly provided.

Details of a suitable head flushness gauge for countersunk head screws and a gauge for checking recess penetration on recessed head screws together with testing requirements for the inspection of tapping screws and approximate hole sizes for steel screws in various materials, are given with appendices.

NOTE 1 Round head screws other than metallic drive screws have not been included in this standard as it is considered that pan head screws provide for most of the applications in which round head screws are normally used and allow more conveniently for the application of torque.

NOTE 2 The titles of the British Standards referred to in this standard are given on page iii.



Ferrous and non-ferrous. Gives general dimensions for countersunk, raised countersunk and pan head tapping screws with slotted or recessed heads, slotted mushroom heads, recessed flange heads and hexagon head tapping screws and round head metallic drive screws. Gauges for head flushness for corrosion head screws and for checking recess penetration of recessed head screws, together with testing requirements and a box with hole sizes also given.

Standard NumberBS 4174:1972
TitleSpecification for self-tapping screws and metallic drive screws
StatusConfirmed
Publication Date1972-09-25
Replaced ByBS EN ISO 1479:1995
Related National Standard OfISO 2770
Technically Equivalent National Standard OfISO 1478, ISO 1479, ISO 1482, ISO 1483, ISO 1481
DescriptorsRecessed-head fasteners, Points (fasteners), Screws (bolts), Threads, Diameter, Radius, Round-head fasteners, Mechanical testing, Pan-head fasteners, Dimensions, Self-tapping screws, Slotted-head fasteners, Hexagonal-head fasteners, Oval-head fasteners, Countersunk fasteners, Drive screws, Length, Heads (fasteners)
ICS21.060.10 Bolts, screws, studs
CommitteeFME/9
ISBN0 580 07337 8
PublisherBSI
Pages52



About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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