{"title":"ASTM F959 DTI Squirter Washers","description":"\u003ch1\u003eFULLERKREG® DTI's — Direct Tension Indicators\u003c\/h1\u003e\n\n\u003cp\u003eFULLERKREG® Direct Tension Indicators (DTI's) are the simplest, easiest to implement, and most cost-effective method for ensuring quality in bolt tightening operations. Compliant with ASTM F959 \/ F959M, RCSC, AASHTO, and FHWA specifications, FULLERKREG® DTI's use a patented orange silicone compound to provide instant visual confirmation of correct bolt preload — no feeler gage required.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eThe Biggest Myth in Bolt Tightening\u003c\/h2\u003e\n\n\u003cp\u003eThinking that reaching the torque value means the bolt is properly tightened. Torque is a rotational force — the force required to rotate the nut along the bolt threads. You can apply a very high torque value to tighten a bolt without actually achieving proper tightness. On construction sites, many factors cause additional torque increase, such as dirt, dust, high temperatures, rust, rain, moisture, damaged threads, poor thread precision, excessive surface coating, improper storage, insufficient lubrication, and even issues with the torque tool itself.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eTension... Is the True Force in Bolt Tightening... Is the Basis for Joint Design\u003c\/h2\u003e\n\n\u003cp\u003eTension is the linear force generated when a bolt is stretched. The bolt's elongation clamps two components together firmly. It is the true force that creates a solid joint. Tension is the actual goal of bolt tightening operations.\u003c\/p\u003e\n\n\u003cp\u003eStandard \u003cstrong\u003eDirect Tension Indicators (DTIs)\u003c\/strong\u003e are specially designed, stamped, heat-treated, coated, and tested washers featuring several semicircular raised protrusions (bumps). When used with high-strength bolts in steel structural connections, the tension gradually increases during tightening. The raised protrusions on the washer are compressed and gradually flattened by the pressure from above. When the blade of a feeler gage can no longer enter the gap and touches the bolt shank, it indicates that the deformation of the washer protrusions has reached the required amount (designed for a compression load equivalent to 70% of the bolt's minimum tensile strength or minimum preload).\u003c\/p\u003e\n\n\u003cp\u003eThe Direct Tension Indicator is a displacement control method that directly responds to tension, free from the influence of thread conditions and other resistances that affect torque. Standard DTIs were developed in North America as early as the 1970s. However, because deformation verification and inspection still required the use of a feeler gage, they were not particularly convenient to use and therefore did not become widespread in steel structural bolting operations.\u003c\/p\u003e\n\n\u003cp\u003eIn 1996, \u003cstrong\u003eFULLERKREG\u003c\/strong\u003e developed the \u003cstrong\u003eFULLERKREG® Direct Tension Indicators (FULLERKREG® DTI's)\u003c\/strong\u003e. This innovation fills the grooves on the backside of the protrusions with a soft \u003cstrong\u003eorange silicone compound\u003c\/strong\u003e and incorporates discharge channels. When the washer protrusions are gradually flattened under load, the orange silicone compound is extruded through the channels and appears around the perimeter of the tension indicator. This allows the deformation of the tension indicator to be confirmed and inspected visually.\u003c\/p\u003e\n\n\u003cp\u003eThis innovative invention fully realizes the functionality and practicality of Direct Tension Indicators. FULLERKREG® Direct Tension Indicators make bolt tightening a simple and rapid operation: start turning the nut (bolt head)... tighten... when the appropriate amount of orange silicone compound (pre-calibrated to the required preload) extrudes around the indicator, stop turning the nut (bolt head)... correct bolt tensioning is complete.\u003c\/p\u003e\n\n\u003cp\u003eCurrently, there are four methods for applying preload to high-strength bolts: \u003cem\u003eCalibrated Wrench\u003c\/em\u003e, \u003cem\u003eTurn-of-Nut\u003c\/em\u003e, \u003cem\u003eTorque Control Bolts\u003c\/em\u003e, and \u003cem\u003eDirect Tension Indicators\u003c\/em\u003e. When used correctly, all four methods can produce the correct preload. However, except for FULLERKREG® Direct Tension Indicators, the others are all torque-based methods for bolt tightening, each with varying degrees of construction complexity and effectiveness differences. Steel construction professionals unanimously agree that FULLERKREG® Direct Tension Indicators are the most reliable and simplest of these methods for achieving correct preload.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFULLERKREG® Direct Tension Indicator Features\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eEasier \u0026amp; Superior to Turn-of-Nut and Calibrated Wrench Methods\u003c\/strong\u003e\u003cbr\u003e\nNo need to mark or remember to stop tightening at 1\/3, 1\/2, or 2\/3 turns. No need for daily or per-batch bolt condition and torque wrench verification or recalibration.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSuperior to Torque Control Bolts\u003c\/strong\u003e\u003cbr\u003e\nDirect tension control, not torque control. No special proprietary tightening tools required. No broken-off ends that become potential jobsite safety hazards and sources of bolt corrosion. No issues with the tail end breaking off due to torque before the steel components are joined.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSuitable for High-Strength Bolts of Any Length; Bolt Quality Inspection\u003c\/strong\u003e\u003cbr\u003e\nEven for extremely short or long bolts, FULLERKREG® Direct Tension Indicators activate accurately when the tension value is reached. Derived inspection function — to examine bolt performance when pre-tension locking quality cannot be reached repeatedly or when there are doubts about bolt sourcing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePrevents Excessive Torque, Accurately Controls Bolt Tightening\u003c\/strong\u003e\u003cbr\u003e\nThe installer knows exactly when to stop tightening. Some applications require bolts to be slightly tighter without over-tightening. FULLERKREG® Direct Tension Indicators achieve effective, accurate control that was previously impossible.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAchieves Optimal Snug-Tight Conditions\u003c\/strong\u003e\u003cbr\u003e\nThe orange silicone compound appears in trace amounts, small amounts, or full amounts (design preload), allowing bolt tightening status to be known and controlled. This facilitates completing correct tension on every bolt in sequence, achieving the most uniform and optimal bolt snug-tight condition and consistency across all bolt groups for the best steel assembly quality. All participating parties highly recognize the locking quality of FULLERKREG® Direct Tension Indicators.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSimple Visual Direct Tension Indicator; Saves Construction Time\u003c\/strong\u003e\u003cbr\u003e\nThe orange silicone compound is easily identified visually. No other inspection tools are needed during installation; both novice and experienced installers can easily master it. Visual confirmation of locking tension shortens identification time and increases tool relocation speed, saving installation labor hours.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSafer for Inspectors\u003c\/strong\u003e\u003cbr\u003e\nInspectors (quality control checkers) can easily see the amount of orange silicone compound extruded from a distance to identify bolt tightening status. They do not need to carry inspection tools and climb up and down steel structures to personally inspect bolts at every joint, nor rely solely on initial feeler gage sampling of a few bolts. In fact, the adoption of FULLERKREG® Direct Tension Indicators allows every single bolt to be inspected.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFULLERKREG® Direct Tension Indicator Certifications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eASTM F959 \/ F959M\u003c\/strong\u003e — Compliant with the American Society for Testing and Materials (ASTM) specification for compressible-washer-type direct tension indicators for structural assemblies. ASTM-F959\/F959M (Metric) specifies the chemical composition, mechanical properties (compression load vs. gap values), and dimensional requirements for compressible tension indicator washers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRCSC\u003c\/strong\u003e — Compliant with the Research Council on Structural Connections (RCSC) specifications for pre-installation verification testing of high-strength bolt assemblies with direct tension indicator washers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAASHTO\u003c\/strong\u003e — Compliant with the American Association of State Highway and Transportation Officials specifications for the installation and testing of compressible-washer-type direct tension indicators for structural assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFHWA \/ U.S. DOT\u003c\/strong\u003e — Compliant with the Federal Highway Administration (FHWA) specifications for pre-installation verification testing of high-strength bolt assemblies with direct tension indicator washers. Over one-third of state DOTs have adopted FULLERKREG® Direct Tension Indicators \/ Standard Direct Tension Indicators as the preferred method for bolt pre-tensioning in bridge construction. While other states have not formally specified them, they highly accept and allow contractors to use FULLERKREG® Direct Tension Indicators \/ Standard Direct Tension Indicators.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGL (Germanischer Lloyd) Certification\u003c\/strong\u003e — For high-strength bolt assemblies M36, M42, and M48 used in wind turbine tower flange connections, FULLERKREG® Direct Tension Indicator washers are certified capable of guiding adequate tightening force to achieve target preload accuracy within ±10%.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eHow to Choose the Right Tightening Method\u003c\/h2\u003e\n\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication Requirement\u003c\/th\u003e\n\u003cth\u003eRecommended Method\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eVisual confirmation required, no special tools\u003c\/td\u003e\n\u003ctd\u003eFULLERKREG® DTI (Squirter Type)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard structural steel, torque wrench available\u003c\/td\u003e\n\u003ctd\u003eCalibrated Wrench or Turn-of-Nut\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHigh-volume, speed-critical assembly\u003c\/td\u003e\n\u003ctd\u003eFULLERKREG® DTI (fastest inspection)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWind turbine tower flange M36–M48\u003c\/td\u003e\n\u003ctd\u003eFULLERKREG® DTI (GL Certified)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBridge structural steel (FHWA \/ DOT projects)\u003c\/td\u003e\n\u003ctd\u003eFULLERKREG® DTI (FHWA compliant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBolt quality verification \/ sourcing audit\u003c\/td\u003e\n\u003ctd\u003eFULLERKREG® DTI (derived inspection function)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFULLERKREG® Direct Tension Indicator Applications\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003ePower Plant Structural Steel Bolts\u003c\/li\u003e\n\u003cli\u003eIndustrial Process Structural Steel Bolts\u003c\/li\u003e\n\u003cli\u003eBridge Structural Steel Bolts\u003c\/li\u003e\n\u003cli\u003eScrubber \/ Distillation Tower \/ Dust Collector Structural Steel Bolts\u003c\/li\u003e\n\u003cli\u003eIndustrial Building Structural Steel Bolts\u003c\/li\u003e\n\u003cli\u003eCommercial Building Structural Steel Bolts\u003c\/li\u003e\n\u003cli\u003eSports Facility Structural Steel Bolts\u003c\/li\u003e\n\u003cli\u003eWind Turbine Tower Flange Connection Bolts\u003c\/li\u003e\n\u003cli\u003eMachinery \u0026amp; Equipment Connection Bolts\u003c\/li\u003e\n\u003cli\u003eSpecial Purpose Connection Bolts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Photo Gallery\u003c\/h2\u003e\n\n\u003cp\u003eFULLERKREG® ASTM F959 DTI Squirter Washers — product range overview:\u003c\/p\u003e\n\n\u003ctable\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 1 ]\u003c\/td\u003e\n\u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 2 ]\u003c\/td\u003e\n\u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 3 ]\u003c\/td\u003e\n\u003ctd style=\"width:25%;text-align:center;padding:12px\"\u003e[ Photo 4 ]\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose FULLERKREG?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e🏭 \u003cstrong\u003eDirect manufacturer\u003c\/strong\u003e — factory in China, no middlemen\u003c\/li\u003e\n\u003cli\u003e📐 \u003cstrong\u003eASTM F959 certified\u003c\/strong\u003e — 100% inspection on compression load, gap values, and dimensional tolerances\u003c\/li\u003e\n\u003cli\u003e🌍 \u003cstrong\u003eGlobal export experience\u003c\/strong\u003e — serving structural steel contractors in North America, Europe, and Southeast Asia\u003c\/li\u003e\n\u003cli\u003e📦 \u003cstrong\u003eFlexible MOQ\u003c\/strong\u003e — small trial orders and large bulk shipments both welcome\u003c\/li\u003e\n\u003cli\u003e📋 \u003cstrong\u003eFull documentation\u003c\/strong\u003e — ASTM material certs, GL certification, compression load test reports, RoHS declarations on request\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eFast lead times\u003c\/strong\u003e — standard sizes in stock, ready to ship\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003cp\u003e\u003cstrong\u003eFULLERKREG Fasteners\u003c\/strong\u003e — Precision ASTM and Structural Fastener Solutions, Direct from Manufacturer.\u003cbr\u003eFor wholesale inquiries, technical questions, or custom orders, please contact our sales team.\u003c\/p\u003e","products":[],"url":"https:\/\/www.fullerkr.com\/collections\/astm-f959-dti-squirter-washers.oembed","provider":"Fullerkreg Fasteners","version":"1.0","type":"link"}