Dtis are manufactured in compliance with en 143999 and can be supplied with ce approved preload bolting assemblies. However, the hardness of dtis will typically be considerably lower than the hardness of a standard throughhardened steel f436 washer. Dti s are manufactured to the f959 specification finshes. The principle of hsfg bolted connections relies upon tensioning each bolt in the connection to a specified minimum tension so that the desired clamping force will be induced in the connection interface. Open a file by clicking on either the pdf icon or the heat number. This enables the dti to generate superior tightening results while being tightened directly under the nut, without the need for a hardened washer in between the two.
When your bolts are important, you need more than a onetime check you need smartbolts. Benefits of using direct tensions indicators washers. Enables correct tensioning as fast as the wrench can be moved to the next bolt, because the operator can see when to stop. When this washer device is compressed while tightening a bolt or stud, the required clamp load is indicated in the fasteners and induced in the. This style washer is most similar to inchsized fender washers. Be cautious not to over tighten your dti smartbolts significantly past this point, potentially exceeding the proof load, which may cause a loss of calibration or damage the dti indicator. Volume 22 from the desk of peter hobson hobson squirter. Dtis are direct tension indicators with a flexible silicone embedded in the depressions under the bumps. M20 dti direct tension indicators washers h8 buy online.
Dti washer is the worlds simplest cost effective solution to control the tensioning of bolts. Fasteners nut bolt weight calculator hex bolt weight. These washers are used to get bolts installed to the correct tension, regardless of the bolts torque resistance. Thickness of additional washers if used should be included in calculating the maximum total grip length. This specification covers the requirements for two types types 8. Active standard astm f959 f959m developed by subcommittee.
The dti is a specially hardened washer used totally independently of the bolts torque resistance. Washer weights estimated weight lbs per piece size uss flat washer sae or f436 flat washers. Especially with direct tension indicators dtis for structural connections, a visual inspection to determine the direct tension indicators dtis are flat is all that is needed. Fasteners nut bolt weight calculator, check bolt weight calculator in mm, bolt weight calculator in kg, hex bolt weight calculator, foundation bolt weight calculator in kg, ss bolt weight calculator, nut weight calculator in kg. Standard specification for compressiblewashertype direct. Dti washers direct tension indicator manufacturer from delhi.
Specification for structural joints using highstrength bolts december 31, 2009 supersedes the june 30, 2004 specification for structural joints using astm a325 or a490 bolts. Turnasure recommends simply placing the nut directly on top of the dti protusions for these assemblies. Portland bolt has the ability to manufacture or provide nonstandard. Flat washers are used to improve stress distribution, and to span large. We do not use cookies for the processing, collection, or storage of personal data under any circumstances. May 14, 2003 dtis may be heattreated to a hardness range, which depends primarily on the specific dti manufacturers design for the size and type of dti. These washers are unhardened and intended for general use. All information is strictly informative fmp din 93 tab washer size weight m3 0. These washers are capable of indicating the achievement of a specified minimum bolt tension. Dti housing rings selflocking, internal pushon, metric the internal version of the tx with a curved inner rim and.
Certifications iso 9001 2015 certified pressure equipment directiveped 201468ec certified merkblatt ad 2000 w2w7w10 approved asme, astm, api, ams, aisi, sae compliance certification 2019 torqbolt made with in india. Instruction manual for installing highstrength bolts. Dtis may be heattreated to a hardness range, which depends primarily on the specific dti manufacturers design for the size and type of dti. Material thickness h1 heightover protrusions h2 heightof protrusions h3 protrusion tangential diameter d3 protrusion internal diameter d4 min. Nsf certifies the sanitary course which is intended for reducing 99. Tens of millions of squirter dti s have revolutionized the boltup process on power plants and other structural steel projects, making bolt installation and inspection easy and accurate. The dti is placed under the bolt head or nut, and the protrusions create a gap. Metric din 127 helical spring split lock washers are commonly used metric lock washers it is a split metal ring that is bent into a helical shape. Compressible washer type direct tension indicators dti as per en 143999 known formerly as load indicating washers used in conjunction with bolt and nut face washers are a load indicating device which are placed under the bolt head or under the nut. Bs en 143999 dti washer feeler gauge requirements direct tension indicator positions designation h8 and h10 thickness of feeler guage under bolt head, when nut is rotated 0.
Washers provide a smooth bearing surface and are used under the head of a bolt and or a nut. Therefore it is important that the assembly is supplied by one manufacturer who is always responsible for the function of the assembly. Boltnut face washer en 143999 marking hbhn hbhn suitability test for preloading en 143992 en 143992 preloaded bolted assemblies are very sensitive to differences in manufacture and lubrication. The standard for dtis in north america is the astm international series of standards and the specific designation for testing and manufacturing dtis is astm f959. Hexagonal socket head cap screws weight chart, hexagonal socket set screws weight chart, csk phillips cross recessed head machine screws weight chart, machine screws weight chart, washers weight chart, fully threaded unc astm studs weight chart, nuts weight chart, fully threaded rods weight chart, high strength structural bolts weight chart, m. Unique curved protrusion design of turnasure dtis reduce necessary of using nut face bolt face washers for 8. Dinstockltd,unitc1hortonwood10 welcome to the world of fasteners from. Remember, when dti s are used, every bolt gets an in situ rc test, because. Standard dtis and squirter dtis are made to astm f959. Direct tension indicator washers or dti washers are manufactured in 8. Provides high consistent bolt tension in heavy hex structural bolts. Dti washers are simple washer load cells that are manufactured with raised dimples that are used to indicate when the proper tension level has been achieved during tightening, since tension is what we are after not torque. Dti s are like little individual weigh scales, which measure the bolt tension developed during tightening, regardless of the torque resistance of the bolt. Direct tension indicators washers dti en 14399 part 9.
Some applications prefer bolts tightened over a minimum, without over tightening. The special configuration of the turnanut dti is possible because of the unique geometry of dtis, covered by worldwide patents. Dtis 20 itis essential that direct tension indicators be properly oriented in the assembly a the bolt head is stationarywhile the nut is turned dtiunder bolt head b the bolt head is stationarywhile the nut is turned dtiunder nut washer required c the nut is stationary while the bolt head is turned dti under bolt head washer. All our washers are marked with our headmark fast previously and. Regular thickness f436 washers over short slots or oversized holes, but extra thick 516 f436 washers if the bolts are a490 larger than 1 dia.
The astm describes as capable of indicating the achievement of a specified minimum bolt tension in a structural bolt and are intended for installation under either a bolt head or a hardened. Thus, dtis shall not be used as a substitute for hardened steel washers. Load indicating washers may be available for other bolt grades as well. The smartbolts visual indication system provides an accurate visual representation of actual bolt tension, in real time. Load indicating washers liw are used to develop the correct tension when installing a325 or a490 structural bolts. The inservice tension may then be monitored at any later time by observing the color of the dti indicator and matching to the guide. The director tension indicator dti is a specially hardened washer with protrusions on one face see figure 1.
Plainwashers bs4320metricseries insidediameter d1 nom. Dtis provide precise measurement of clamping forces regardless of bolt condition. Specification for structural joints using astm a325 or a490 bolts june 30, 2004 supersedes the june 23, 2000specification for structural joints using astm a325 or a490 bolts. By far the simplest method, a dti is put on one or the other end of all bolts, and after snugging the joint by partially but not fully compressing the dti, all the dtis are crushed to the point where a feeler gage cannot be inserted half way around.
Dtis are like little individual weigh scales, which measure the bolt tension developed during tightening, regardless of the torque resistance of the bolt. Washers are for assembly around a bolt or screw, between the bearing surface of the fastener and the part to which it is attached. Dti washers, direct tension indicator washer, manufacturers. Metric din 127 type b helical spring split lock washers. Squirter dti washers are an innovative direct tension indication dti device. Portland bolt has the ability to manufacture or provide nonstandard square, rectangular, or. The load indicating washer was invented in england in 1962. Squirter dti direct tension indicator washers dimensions squirter dti direct tension indicator washers astm f959m mechanically galvanised part size no. Flat washers are covered under the astm specification f844. Astm f standard specification for compressible washer type direct tension indicators for use with structural fasteners.
With uniform bolt load, your fastened joint is more reliable. As the gap is tensioned, the clamping force flattens the protrusions, reducing the gap seefigure 2. Put the dti under the bolt head with the bumps facing the underside of the bolt head. 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. These unique, patented fasteners deliver consistent, reliable bolt tension, along with installation and inspection efficiency. Dti washer direct tension indicator a dti washer is a specialty load indicating washer which contains little arches on the washer surface that flatten when installed to the correct tension. Ramesh steel corporation, was incepted in 1983 by mr. Bolts, nuts, washers, and direct tension indicators used in the testing. A dti washer is a specialty load indicating washer which contains little arches on the washer surface that flatten when installed to the correct tension. When compressed by tightening the nut, the washer bites into the. If you would like to prevent our website from using cookies or remove existing ones, you will need to adjust the cookies settings in your browser.
Din 6796 dimensions, specifications, standard, weights. Check all bolt, nut, flat washer, and dti certifications for conformance with the project specifications, especially the rotational capacity rc tests, if applicable, for nut lubrication. Specification for structural joints using astm a325 or a490 bolts. As the bumps in the steel dti washer are compressed by the action of tightening the bolt, the silicone is squirted out and becomes a visible indicator of correct bolt tension. Turnasures legacy company invented this brilliant concept of bolting technology. Andrews fasteners company in manufacturing direct tension indicators washers dti washers in well know in construction industry company based in united states turnasure. M20 dti direct tension indicators washers grade h8 to fit preload bolt assemblies with hr bolt grade 8. Dti s 20 itis essential that direct tension indicators be properly oriented in the assembly a the bolt head is stationarywhile the nut is turned dtiunder bolt head b the bolt head is stationarywhile the nut is turned dtiunder nut washer required c the nut is stationary while the bolt head is turned dti under bolt head washer. Until en 10902 allows these extra washers to be an option, they have to be used, unless the project specification permits tensioning of the assemblies without them. Made to astm f969 for use with a325 and a490 bolts. Fastenal uses cookies to improve website user experience. Fasteners chart, washers weight chart washers size. Figure 5a with a shortslotted or oversized hole under the bolt head add a hardened flat washer between the dti and the hole, and if the bolt is also an a490m larger than m24 the hardened washers must be at least 8.
Split lock washers are a left hand helix and allow the nut to be tightened in a right hand direction only. For additional assurance check a few bolts with the provided feeler gauge used as a nogo inspection tool and compare the rest by eye. Shop the inventory of construction and industrial supplies, fasteners, power tools and accessories online at. Dti are one of four methods allowed to ensure that structural bolting is correctly installed. Jan 03, 2017 direct tension indicators washers to bs en 143999. Standard specification for compressible washer type direct tension indicators for use with structural fasteners. Applied bolting technology manufactures direct tension indicating dti washers. Specification for structural joints using highstrength bolts. Over a standard size hole, the dti can replace one flat washer if the design called for a flat washer under both the bolt head and the nut. Unlike dti washers, smartbolts can be operated without special tools or training, and can be reused indefinitely.
Astm f959 covers the requirements for compressible washer type direct tension indicators in diameters ranging from 12 to 112 inclusive. An astm designation number identifies a unique version of an astm standard. Mechanically galvanised washer properties not affected like hot dip galvanising. Turnasure manufactures simple washer type load cells known as a direct tension indicator or a load indicating washer. Table 1 systems of boltnut washer assemblies boltnut washer assembly system hr boltnut washer assembly system hv general requirements en 143991 boltnut assembly en 143993 or en 143997 en 143994 or en 143998 marking hr hv property classes 8. Dtis can be used with bevel washers to accomodate over a 1. Tapered washers above left are used when the surface being bolted has a sloped surface, such as the flange of a channel or an s shape a325 bolts require a washer under the element head or nut being turned to tighten 12 the bolt shown under the nut, above right a490 bolts require a washer under both the head and nut aisc.
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