Category: Bs bolts

Bs bolts

This is the first in a six-part series of international standards on the mechanical and physical properties of stainless steel fasteners. It specifies property classes in relation to austenitic, martensitic, ferritic and duplex austenitic-ferritic steel grades for fasteners. There are other standards which deal specifically with specialized areas such as oil and gas but this considerably revised document provides an excellent foundation for any assessment.

The standard has been revised to reflect the standardization of duplex stainless steels. Multi-user access to over 3, medical device standards, regulations, expert commentaries and other documents. Worldwide Standards We can source any standard from anywhere in the world. Learn more about the cookies we use and how to change your settings.

Online Tools. Search all products by. Mechanical properties of corrosion-resistant stainless steel fasteners.

bs bolts

Bolts, screws and studs with specified grades and property classes. Mechanical properties of fasteners made of carbon steel and alloy steel. Part 3. Flat washers with specified property classes. Click to learn more. Manufacturers and distributors of stainless steel fasteners Structural and consulting engineers Construction and civil engineering contractors and larger sub-contractors Test houses and laboratories Industries associated with oil and gas production and distribution Why should you use BS EN ISO ?

British Standard Descriptions

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7 NEW IDEAS USING BOLTS AND NUTS

The faster, easier way to work with standards. Learn how. Tracked Changes. Understand the changes made to a standard with our new Tracked Changes version. Learn more. Mechanical properties of corrosion-resistant stainless steel fasteners Nuts with specified grades and property classes.

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Grade 8.8 Bolts

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Accept and continue Learn more about the cookies we use and how to change your settings. Fasteners, Austenitic steels, Torsion testing, Mechanical properties of materials, Classification systems, Bolts, Tensile testing, Stainless steels, Hardness testing, Corrosion-resistant steels, Chemical composition, Screws boltsIntergranular corrosion, Threads, Test equipment, Elongation at fracture, Studs fastenersDesignations, Torsional strength, Threaded fasteners, Martensitic steels, Tensile strength, Grades qualityHardness, Tensile stress, Mechanical testing, Ferritic steels, Marking, Steels, External-thread fasteners, Torque, Temperature.

Mechanische Verbindungselemente.Bolting is generally preferred for the site connections in short and medium span steel bridges because it can be carried out more quickly than weldingand with less interruption to the flow of erection. Installation and tightening of bolts is a major site activity and the designer should consider the access for operatives and equipment.

If insufficient attention is paid, the result can be components that cannot be fitted or bolts that cannot be tightened with standard equipment.

Permanent bolted connections of structural parts of bridge steelwork are almost always made with preloaded bolts, as recommended in BS EN [1]. Such connections are designed in shear as slip-resistant connectionssuch that they do not slip at either the serviceability limit state or the ultimate limit state the choice being a matter for design. Preloaded bolts are seldom used in buildings, where fatigue and slip in service are less critical.

However, they may be used where oversized or slotted holes are used to increase tolerances during assembly. That standard has 10 separate parts; of particular note are:. System HV Hochfest Vorgespannte Verbindung assemblies have a short bolt thread and use a thinner nut to obtain ductility by plastic deformation of the threads within the nut.

Both HR and HRC assemblies achieve the necessary ductility primarily by plastic deformation of the bolt threads. These systems of bolting are less susceptible to overtightening during preloading.

However, if these assemblies are overtightened, the ductile failure mode is by yielding and eventually fracture of the bolt. This type of failure is easily detectable. System HR assemblies are available in M12 to M36 diameter in property class 8. Generally, property class 8.

bs bolts

See later section on Installation of preloaded bolts for discussion of k -class. Countersunk head preloaded bolts are available as system HR and HRC or TCBs but these should not normally be used, except where a flush finish is essential for functional not aesthetic reasons.

Weathering grade bolting assemblies are not specifically covered in the BS EN [3] series. The execution standard BS EN [8] section 5. System HR weathering grade assemblies are available in property class 8. Slip-resistant connections depend for their performance on the tightening of preloaded bolts to a specified minimum preload and a friction coefficient for the faying interface surfaces.

British Standard Whitworth

The level of preload in a bolt is governed by three things:. Frictional resistance is highly dependent on the surface conditions. Four classes of friction surface are defined in BS EN [2] and slip factors given for each.

The surface treatment that may be assumed for each of these classes is given in BS EN [8] and is reproduced below. If the friction surface has any other surface treatment, the slip factors must be established by slip tests, as described in Annex G of BS EN [8]. Weathering steel is not explicitly mentioned in the above surface treatments and this might give rise to some uncertainty as to whether surfaces of weathering steel might suffer any reduction in slip factor over time, before the joint is bolted up.

Research into this by Lark R. J [9]. The research also demonstrates that for carbon steel grades there is no appreciable reduction in slip factor at 40 days of exposure. Before assembly of the joint at site, any contamination of the slip resistant surfaces by oil or grease must be removed by suitable chemical means, as flame cleaning usually leaves harmful residues.

If the joint cannot be assembled as soon as the surfaces have been treated, or as soon as any protective masking has been removed, it is sufficient to remove any thin film of rust or other loose material with a wire brush.

During this process, the surfaces must not be damaged or made smooth.BS Specification for machine screws and machine screw nuts B. Specification for black bolts, screws and nuts, hexagon and square, with B. Specification for precision hexagon bolts, screws and nuts B. Normal series. Heavy series. Specification for parallel and taper dowel pins having screw threads for extraction purpose - metric series.

Specification for phosphor bronze spring washers for general engineering purposes. Specification for machine screw nuts, pressed type B. Specification for spring retaining rings, carbon steel circlips - metric series. Specification for hexagon socket head cap screws and wrench keys - metric series.

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Specification for hexagon socket set screws with flat point and wrench keys - metric series. Specification for hexagon socket set screws with cone point and wrench keys - metric series. Specification for hexagon socket set screws with dog point and wrench keys - metric series.

Specification for hexagon socket set screws with cup point and wrench keys - metric series. Specification for hexagon socket button head screws and wrench keys - metric series. Specification for hexagon socket shoulder screws and wrench keys - metric series. Specification for hexagon socket countersunk head screws and wrench keys - metric series.

Specification for metal washers for general engineering purposes - metric series. Specification for spring washers for general engineering and automobile purposes - metric series. Specification for metric black cup and countersunk head bolts and screws with hexagon nuts. Specification for split pin holes and wire holes in bolts, screws and studs.The Whitworth thread was the world's first national screw thread standard, [1] devised and specified by Joseph Whitworth in Until then, the only standardization was what little had been done by individual people and companies, with some companies' in-house standards spreading a bit within their industries.

The thread pitch increases with diameter in steps specified on a chart. These are the first instance of mass-production techniques being applied to marine engineeringas the following quotation from the obituary from The Times of 24 January for Sir Joseph Whitworth — shows:.

The Crimean War began, and Sir Charles Napier demanded of the Admiralty gunboats, each with engines of 60 horsepowerfor the campaign of in the Baltic. There were just ninety days in which to meet this requisition, and, short as the time was, the building of the gunboats presented no difficulty. It was otherwise however with the engines, and the Admiralty were in despair. Suddenly, by a flash of the mechanical genius which was inherent in him, the late Mr John Penn solved the difficulty, and solved it quite easily.

He had a pair of engines on hand of the exact size. He took them to pieces and he distributed the parts among the best machine shops in the country, telling each to make ninety sets exactly in all respects to the sample. The orders were executed with unfailing regularity, and he actually completed ninety sets of engines of 60 horsepower in ninety days — a feat which made the great Continental Powers stare with wonder, and which was possible only because the Whitworth standards of measurement and of accuracy and finish were by that time thoroughly recognised and established throughout the country.

An original example of the gunboat type engine was raised from the wreck of the SS Xantho by the Western Australian Museum. On disassembly, all its threads were shown to be of the Whitworth type. With the adoption of BSW by British railway lines, many of which had previously used their own standard both for threads and for bolt head and nut profiles, and improving manufacturing techniques, it came to dominate British manufacturing. In the US, BSW was replaced when steel bolts replaced iron [ citation needed ]but was still being used for some aluminium parts as late as the s and s when metric -based standards replaced the Imperial ones.

American Unified Coarse was originally based on almost the same Imperial fractions. Confusion can arise because each Whitworth hexagon was originally one size larger than that of the corresponding BSF fastener. In both cases the spanner jaw width of 0. Certain branches of industry used Whitworth fasteners with a smaller hexagon identical to BSF of the same bolt diameter under the designation "AutoWhit" or Auto-Whit [ citation needed ] [6] and this series was formalised by the British Engineering Standards Association in as standard No.

During World War II the smaller size hexagon was adopted more widely to save metal [8] and this usage persisted thereafter. Whitworth fasteners with the larger hexagons to BS are now often colloquially referred to as 'pre-war' size, even though that is not strictly correct. This is more like the modern "mechanical" screw and was used for fine machinery and for steel bolts. The British Association screw thread BA standard is sometimes classed with the Whitworth standard fasteners because it is often found in the same machinery as the Whitworth standard.

However it is actually a metric based standard that uses a These pipe thread designations do not refer to any thread diameter. Companies that initially converted to metric threads have converted back, after complaints that the finer metric threads increased the time and difficulty of setup, which often takes place at the top of a ladder or scaffold.

Fixings for garden gates traditionally used Whitworth carriage boltsand these are still the standard supplied in UK and Australia.Hex bolts from ITA Fasteners are mostly used in repair and construction work. As the name implies, they have a hexagonal head and come with machine threads for a firm and rough handling. They come in a wide range of different hex bolt sizes for custom applications depending on its dimensional requirements.

Depending on the length of the bolt, it can come with standard threading or full threading. Since it is made out of such strong materials, these high quality grade 8.

These Hex Bolts can also be used in marine and coastal operations due to its anti-corrosion property. We ensure that all our products are durable and high strength components which can only enhance your work's credibility. If you require stainless steel hex bolts, hex head bolts or hex bolts in large orders, get in touch with us to get a quote. The fasteners used in structural Our studs come in various sizes for applications Eye bolts are a commonly used component in various construction.

These bolts from ITA Fasteners are fully threaded and will come with a collar or Wing screws are generally used in construction applications to allow users to make direct adjustments and change calibrations.

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These screws feature Carriage bolts are mostly used in wood to wood fastening and general construction of decks, porches, swing sets and other home auxiliary units. Standard and Custom Bent bolts from ITA Fasteners are durable and corrosion resistant because of the stainless steel make. These bolts find their use Double ended threaded studs from ITA Fasteners are steel bolts which are threaded on both ends.

After the stud is screwed and secured in the middle Home Fasteners Bolts Hex Bolts. Eye Bolts Eye Bolts Eye bolts are a commonly used component in various construction. Wing Screw Wing Screw Wing screws are generally used in construction applications to allow users to make direct adjustments and change calibrations. Carriage Bolt Carriage Bolt Carriage bolts are mostly used in wood to wood fastening and general construction of decks, porches, swing sets and other home auxiliary units.Grade 8.

This is a structural grade for bolts. This is a medium carbon steel bolt specification.

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These bolts are heat treated by quenched and tempered methods. Navstar Steel is a leading manufacturer and supplier of the Grade 8. These are suitable for low tensile strength applications as the medium carbon material has low tensile strength. But the medium carbon content makes the Class 8. The High Tensile Class 8. The threads on the studs are male and they connect to the equally sized female threaded components on both ends of the stud.

The BS Grade 8. There could be zinc plated, hot dip galvanized or plain types of bolts. The M20 Grade 8. The products are used in a variety of industrial applications ranging from domestic, commercial to industrial applications. They are suitable for low strength applications with low corrosion risks.

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Please contact us for more information on the products and pricing. Class 8. Table of Contents. High Tensile Class 8. BS Grade 8. Types Of M20 Grade 8. M12 grade 8. Yield Strength MPa Min. Tensile Strength MPa Class 8. Price of Grade 8. GR A not applicable to these diameters 6. GR A not applicable to these diameters 0. GR A not applicable to these diameters 7. Not specified as full thread recommended Tailor Made Fasteners for optimum output.

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BS Standards. A and B. BS 3S Specification for carbon steel bar for the manufacture of forged bolts only BS 2A Specification for aluminium alloy hexagonal headed bolts B. Countersunk flat head screws common head style with type H or type Z cross recess — Product grade A. Steel property class 4. Steel of property class 8. Mechanical properties of fasteners — Nuts with specified proof load values — Fine pitch thread.

Timber structures — Product requirements for prefabricated structural members assembled with punched metal plate fasteners. Railway applications — Track — Performance requirements for fastening systems — Part 4: Fastening systems for steel sleepers.

Railway applications — Track — Performance requirements for fastening systems — Fastening systems for slab track. Timber structures — Test methods — Determination of the yield moment of dowel type fasteners — Nails.

Railway applications — Track — Performance requirements for fastening systems — Definitions. Hand-held non-electric power tools — Safety requirements — Assembly power tools for threaded fasteners.

Mechanical properties of fasteners — Nuts with specified proof load values — Coarse thread. Railway applications — Track — Test methods for fastening systems — Effect of severe environmental conditions. Specification for design and performance requirements for turnlock, stud-type panel fasteners metric series. Method of measurement for reaction torque and torque impulse from hand-held pneumatic assembly tools for installing threaded fasteners.

Mechanical properties of fasteners — Bolts, screws, studs and nuts made of non-ferrous metals. Railway applications — Track — Performance requirements for fastening systems — Fastening systems for concrete sleepers. Fasteners — Preloading test for the detection of hydrogen embrittlement — Parallel bearing surface method. Tolerances for fasteners — Plain washers for bolts, screws and nuts — Product grades A and C.

bs bolts

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