What is the purpose of bolt tightening sequence in flanged. Insert the bolt through the connection and then place the washer chamfered side outermost onto the bolt followed by the nut fig 1. Hsfg bolts hsfg bolts advantages bolts can be installed much quickly as compared to. The high strength friction grip hsfg property class 8. High strength friction grip washers available in a range of sizes and materials from fastenright.
Structure bolts, nuts and washers in friction grip joints. High strength friction grip fastener specifications fastenerdata. High strength friction grip bs en 143999 specifies, together with bs en 143991, the requirements for assemblies of highstrength structural bolts and nuts, with large width across flats, of system hr or hv, including the requirements for the general dimensions, tolerances, materials and performance for two grades, h8 and h10, of compressible washertype direct tension indicators, nut face. High strength friction grip bolts hsfg bolts are high strength structural bolts which have been tightened such as to induce tension in the bolt shank. Oct 09, 2012 torque for ht hsfg bolts dear readers, wish you a happy durga pooja.
Properties of hsfg bolts march 22, 2017 bolts are extensively used as a fastener. Methods that depend on displacement of the nut only require. Typical values for k with mildsteel bolts in range 14 to 1. Installation procedure for preloaded tcb bolts tension.
Fitted bolts and 3 high strength friction grip hsfg bolts. Sep 10, 2018 bolts used in steel structures are of three types. Security fasteners and general fixings from stock and to order. Naturally m24 bolts take more force to tighten than m16 bolt. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. The bolts are tightened to a shank tension so that the transverse load across the joint is resisted by the friction between the plated rather than the bolt shanks shear strength. Panchsheel fasteners identified a need of direct tension indicating washers popularly known as dti washer to ensure the proper tightening of the hsfg bolts. Typically hsfg bolts are used in bridges, cranes and crane girders. Pdf determination of the required partturn of the nut with. Bolts are maintenance free and do not get loose under vibrations. Preloaded hsfg bolts nonslip in service with s355 view other design data bs 5950. Highest grade friction grip hsfg bolt loading capacities table. What are the differences between rock dowels and rock bolts. A wide variety of hsfg bolts options are available to you, there are 16 suppliers who sells hsfg bolts on, mainly located in asia.
Bolted connections i version ii 33 5 high strength friction grip bolts hsfg provide extremely efficient connections and perform well under fluctuatingfatigue load conditions. They are widely demanded in the automobile, chemical, power plant and other related industries, and are known for their uniform thickness. Hardened steel structural washers are used in combination with structural bolts in heavy construction applications. The bolts were 100mm long hsfg m20 with 50mm long shank, and 110mm hsfg m24 with 55mm long shank. These types of bolts are acknowledged for their remarkable resistance. Hsfg bolts are used in connections where any slight slip movement would render the integrity of the whole structures break down. Does it matter whether you tighten the bolt head or the nut.
Frequently asked questions on bolting matters bolt science. Tension control bolts are quick, safe and easy to install. Type hb hollo bolt type countersunk hollo bolt type flush fit hollo bolt other hollo bolt hb options stainless steel hollo bolt type lb2 lindibolt 2. High strength friction grip bolt stalwart technosource. Diy brick rocket stove cooking without power duration. We can provide high strength friction grip washers which are perfect for tolerating heavy loads on thin sheet metal. What is the reason of retightening in flanged joints. Hsfg bolts using torquetension values will notice that this manual does not relate torque to tension.
The patented process is a thermochemical surface modification tcsm which can be applied to various metals, alloys, sintered ferrous base materials, grey iron and cast iron. Live simple, live free tinyhouse prepper recommended for you. The energy taken to twist the nut up the thread of the bolt measured in nm. Of the various types of bolts which are in use the hsfg bolts are widely used. The bolts with the hrc method tc bolts are tightened using a special wrench where the nut is rotated while reacting against the splined bolt end. Hsfg bolts high strength friction grip bolts bolts.
Because of their automatic installation process, the installed preload is expected to be established with reasonable confidence. We at indiana steel being in the steel business since long and are involved in the manufacture and supply of various kinds of fasteners includes bolts. Tcbs from tension control bolts ltd are the most effective and most efficient method for installing preloaded or hsfg bolting assemblies. Specification for structural joints using highstrength bolts.
The number of high strength friction grip bolts required to satisfy shear stress requirements through the tensile stress area is much less than the number of bolts required to prevent slip using bs5950. The results of experiments carried out on two different hsfg bolt sizes i. Bolts should not be used as drift pins to achieve alignment. Pdf the high strength friction grip property class 8.
Hsfg bolts what you need to know about hsfg standards. Find here details of companies dealing in high strength friction grip bolts. We manufactured these using plain carbon steel as well as alloyed steel through controlled heating. Here is some useful information relating to high strength friction grip bolts. Jun 12, 2012 d bolts nominal diameter p clamp load or bolt s desired tensile load generally 75% of yield strength above three factors affect how much tension occurs when a given amount of tightening torque is applied. Slip critical bolted connections a reliability analysis for design at the ultimate limit state report prepared for the american institute of steel construction by gilbert grondin, phd, p. The contacting surfaces must be free of rust, grease, mill scale etc. The nuts shall be hardened and then tempered at a temperature of at least 425 0c. Since the bolts are preloaded the tension in the bolt doesnt vary as much as in a standard bolt, so they dont fatigue as quickly.
Aug 19, 2015 fabricated in compliance with the international quality standards, we offer a wide range of high strength friction grip bolts. The use of high strength structual fasteners in friction grip joints has been one of the most importnat developments in structural engineering over the last four decades. The relation between applied torque and axial force or load in a bolt can be calculated as. They also will prevent any slip between the plates, which means your fastener wont come loose. Visit listed manufacturers, suppliers and exporters offering wide range of hsfg bolts at affordable price. High strength structural bolt has a large bolt head and nut as it is designed to withstand full tensioning. This program also provides large databases on thread, bolting materials and nut factors. The drivers of this research were the practical and theoretical. Are washers necessary for proper operation of bolts. Tension control bolts ltd supply tcbs and shear wrenches to companies. What is the difference between normal bolts and high friction.
Hsfg bolts have much better fatigue performance as compared with the rivets. For the installation of preloaded bolts, steelwork contractors should employ a certificated bolting coordinator and appropriately trained operatives, in accordance with the requirements of nhss 20, and the bcsa standard for competence in preloaded bolting. Hsfg bolts high strength friction grip they make use of friction. For hsfg bolts, the property classes to be used are 8, and 10 as specified in is 67 part 6, suitable for bolts of property class 8. What are the advantages of using high strength friction grip. Bolts which transfer load by friction are known as high strength friction grip hsfg bolts. The main advantages of hsfg bolted connections are their greater stiffness and their ability to withstand alternating forces. Is it desirable to use concrete of very high strength i. Engineering iso metric hardware design data engineering ansi hardware design data. Friction grip hsfg bolts according to the current new zealand practice.
During traditional tightening, the tension being achieved is unmeasured it is the tightening force being applied torque that is measured. Applied bolting dti location nut side assembly youtube. What is the difference between normal bolts and high friction grip bolts. What are the advantages of using high strength friction grip hsfg bolts when compared with normal bolts. What is the difference between normal bolts and high. The washer reduces galling between the tightened surfaces and spreads the load.
Preloaded hsfg bolts nonslip in service with s355 blue. En 14399 preload bolt assemblies ce marked highstrength. What is the behaviour of internal force in preloaded fasteners. If you continue to use this site we will assume that you are happy with it.
Sep 23, 2015 we are enlisted as top company involved in offering a wide range of hsfg bolt. Download table installation tension of the bolts and the corresponding test number. The complete high strength friction grip principle. Slip critical bolted connections a reliability analysis for. A physical pre installation check was undertaken for all of the bolts before the tightening tests. Installation and tightening of bolts is a major site activity and the designer. High tensile hex bolts, hsfg bolts, bolts, screws, fasteners. Fastenerdata metric coarse high strength friction grip h. The hrc bolts are calibrated so that when the nut stops rotating the spline shears at a breakneck and the required preload is achieved. Metric hardened flat washer hsfg hardened steel bs en 143999.
Our company holds immense experience in this business and is involved in presenting an enormous quality assortment of hsfg bolt. If you find yourself in need of hsfg bolts we will. Asnzs 4100 specifies conditions for the application of high strength structural bolts in both friction type and bearing type joints. The hsfg bolts are meant to be used with hardened steel washers to protect the connected parts. Previously know as high strength friction grip hsfg we are a manufacturer of ce marked preloaded fasteners to en 14399. Guidelines for use of high strength friction grip hsfg bolts on bridges on indian railways. They normally consist of high tensile strength bolts and nuts with washers. Metric coarse high strength friction grip hsfg class 10. The top countries of suppliers are india, china, from which the percentage of hsfg bolts supply is 37%, 56% respectively. Advertisements iv owing to its high tensile strength, it is commonly used in connections which require the taking up of high flexure and the tensile stress generated could be readily resisted by it high. Hsfg bolts installation guide london structural steel. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to. Please find below documents as a part of our technical support section. If you require more information about hsfg washers, please contact a.
If case of any further questions, please visit our frequently asked questions faq section or contact with andrews fasteners quality department. In our facility in leeds, we can ce approve assembly test to en 143992 hr assemblies from m12 to m36 up to grade 10. Tension control bolts ltd supply tcbs and shear wrenches to companies across the uk and worldwide. Bring the steel sections to be joined together and align the holes with drift pins as seen in the picture.
Controlled tightening of the bolts allows the frictional action to be quantified for design. Installation tension of the bolts and the corresponding test number. They serve various purposes and there may be various types of bolts. High strength friction grip bolt surecon fastening. Torque for ht hsfg bolts dear readers, wish you a happy durga pooja. Similarly en 10902 requires that plate washers must be used. G tension control bolts tcb greenkote pm1 grade 10. Hsfg bolts concerns there is a concern that bolts can. Bolt installation does not require much skilled staff. Professor of civil engineering ming jin, msc doctoral student georg josi, msc, p. Introduction to the design of connections using preloaded bolts in shear. High strength friction grip bolts and nuts tubecon.
Applied bolting dti and squirter dti definition youtube. We use cookies to ensure that we give you the best experience on our website. You can make ads in the engineering toolbox more useful to you. Highest grade friction grip hsfg bolt loading capacities. Nut markings must be outermost to ensure quality assurance is visible for inspection. Hsfg is listed in the worlds largest and most authoritative dictionary database of abbreviations and acronyms. Preloaded hsfg bolts nonslip under factored loads with s275. Mar 22, 2017 bolts are extensively used as a fastener. To confirm its finest quality, this product is strictly examined on varied quality constraints. P anchsheel fasteners is a manufacturer and supplier of highstrength structural fasteners hsfg fasteners.
Owing to its high tensile strength, it is commonly used in connections which require the taking up of high flexure and the tensile stress generated could be readily resisted by it high tensile strength. Hsfg bolts nuts and washers, high tensile hex bolts, socket. Instruction manual for installing preloaded hsfg bolting with turnasure direct tension indicators washers en 143999. Just make sure the dti bumps bear against the underside of the bolt head or against a hardened flat washer, never directly against the nut or the steel plates. This hsfg bolt is extensively applauded amongst our customers for its efficient working and longer functional life. If you find yourself in need of hsfg bolts we will be happy to order them for you. In europe, the mechanical knowledge about this fastener raised from tests carried out to. Jan 15, 2011 high friction grip bolts are commonly used in structural steelwork. High strength tension control bolts tcb bs en 1439910 greenkote is an annovative duffsion coating incorporating the very latest technology. These bolts should be tightened to their proof loads and require hardened washers to distribute the load under the bolt heads. Hsfg bolts are also commonly used in structures that will be exposed to a lot of vibrations, or loadings that will reverse.
Guidelines for use of high strength friction grip hsfg. Approximate masses of ordinary bolts, nuts and washers. Nut and bolt face washers are not required with turnasure dtis grade 8. What are the advantages of using high strength friction. Over 200 customers are regularly using its products since last 40 years. Torque, or twisting force, is not a reliable measure of bolt. Swaged bolts are an alternative to high strength friction grip hsfg bolts for connections in steel structures. Do inclined rock bolts perform better than rock bolts normal to joints. Design for steel bridge construction from to ensure that a steel bridge design can be safely, economically and reliably executed fabricated, assembled and erected, designers should be aware of the processes of fabrication and erection, the capabilities and limitations of the steelwork contractor and how the design. These bolts are supposed to work by passing the load through the frictional forces between the two connections and not through the bolts. Structural bolts installation as41001998 working definitions torque is not used as a measure for the tensioning of structural bolting. As the installation rpm increases, the heat generated during tightening increases. Based on my previous posts you may familiar with grades of bolt, torque of bolt, torque calculations and slip factors.
1245 1351 1172 1395 1582 1199 1489 413 668 951 300 462 436 485 604 618 564 27 141 935 1432 1234 1120 578 823 232 1311 1353 543 1178 775 478 414 1166 1223 629 187 423 1416 1412 584 1227 160