Part 10: System HRC – Bolt and nut assemblies with calibrated preload; Direct tension indicators (DTI) are equivalent to ‘load indicating washers’ and system HRC is effectively the same as Tension Control Bolts (TCBs). History. Load indicating washers have been around since the early 60s and are highly accurate load cell washers with raised protrusions that collapse to a specified gap as the bolt is tensioned/tightened. Bolted joints are one of the most common elements in construction and machine design. Load Indicating Fasteners Maxbolt Load Indicating Fastener Maxbolt load indicating fasteners continuously displays the amount of tension in a bolt or stud. o The load is transferred between members by bearing on the bolts Slip‐critical o The load is transferred between members by friction in the joint Bolted Joint Types. They offer a simple method for accurate joint assembly, and it is the only product available (for most applications) that will continuously clamping force while the fastener is in service. They offer a simple method for accurate joint assembly, and it is the only product available (for most applications) that will continuously clamping force while the fastener is in service. PN. There are two main types of bolted joint designs: tension joints and shear joints. However, when a bolt is tightened against a material, it allows the bolt to distribute the force through the material, so the bolt itself only holds a portion of the load.This means that a bolt can hold a significantly higher load when the correct amount of tension is applied. We are an internationally renowned manufacturer of hot forged industrial fasteners. A wide range of bolts & bolting products including HSFG washers are available from Orbital Fasteners. The bolt load change due to service load will depend mainly upon the relative stiffness between the bolt and the bolted member, as well as other variables. Tension Indicating Fasteners for bolts, anchors and studs. RotaBolt RB1 Touch. With DTIs, the proper gap is verified by a “go/no go” feeler gauge. At Valley Forge, we have developed patented technologies that will completely change your way of thinking about a bolted joint. Determination of service or external loads in a bolted joint by means of preloaded load sensing bolts is not recommended. Therefore, a higher clamp force can be specified due to the greater accuracy of the Preload Load Indicating Washer System. Currently only system HR (High Resistance) and HRC (High Resistance Calibrated) assemblies are used in the UK. load-indicating bolt A special type of high-strength bolt having a small projection which compresses as the bolt is tightened; the amount of projection can be measured with a feeler gauge, thereby acting as a measure of the bolt tension. SPC4™ Load Indicating System. Specification. sonic load sensing equipment. Abstract. Metric PC4.6 Cup Head Bolts & Nuts Metric PC4.6 Coach Screws BSW G2 Cup Head Bolts & Nuts. DTI fasteners fall between these two extremes in both cost and complexity. Intelligent Bolts SPC4TM load indicating fastener technology allows installation of a bolted assembly with confidence. Users can monitor the clamp load of any SPC4TM bolted joint whether static or dynamic, by attaching an indicator datum disc located on the end of the fastener and reading the value with a user friendly mechanical indicator. Load Indicating Washer. View 18 suppliers of Load Indicating Bolts on Suppliers.com including Valley Forge & Bolt Manufacturing, , Fastorq® Bolting Systems, Portland Bolt, Brookdale Industrial Fasteners Ltd Load Indicator Washers Standard AS/NZS 1252, Load indicator washers is a direct tension indicator, Used in the installation of High Strength Structural Bolts, Load Indicator Washer has protrusions on one face, To use insert between the bolt head and he gripped material with the protrusions bearing against the bolt head leaving a gap. (of this repo ) 20, Security Closslf. Knowing the tension of critical joints is a matter of safety, peak performance, and maximum uptime. These washers are used to get bolts installed to the correct TENSION, regardless of the bolt's torque resistance. Valley Forge & Bolt is shifting the paradigm with SPC4™ Load-Indicating Technology that makes it possible to measure the actual tension in a fastener, not just … Applied Bolting Technology manufactures direct tension indicating (DTI) washers. UN. ... Now a nut that confirms that bolt load is achieved Speeds assembly time at connection Quicker tensioning - less torque Eliminates assembly errors Eliminates need to control lubricity The TurnAnut “All-in-one” DTI. Bolt, Bridges, Connection, Fasteners, Load-indicating Unlimited wtth approval of the Washers, Steel Kentucky Transportation Cabinet 19. Material . The Maxbolt™ Load Indicating Fastener System continuously measures and displays the amount of tension in a bolt or stud. Maxbolt Load Indicating Fasteners, a patented product of Valley Forge & Bolt Mfg. (of lhls page) 21. Unlike single-use alterna-tives such as DTI washers, DTI fasteners are designed for reuse and to continuously indi-cate clamp load throughout fastener service life. No. TurnaSure manufactures simple washer-type load cells known as Direct Tension Indicators or Load Indicating Washers. of Pages 22. Tension-Indicating Washers for Structural Applications When you’ve applied the correct tension, these washers release an orange dye as a visual indicator. 1.1 This specification covers externally threaded bolts, studs, and cap screws as defined in Table 1, herein called fasteners, capable of indicating clamping forces up to yield strength during the tightening process or post installation residual tension, or both.Load-indicating fasteners utilize mechanical, electronic, or ultrasonic means to indicate fastener tension. Used in high strength friction grip / preloaded bolt assemblies; Available in Carbon steel property classes 8.8 and 10.9; Also know as a Direct Tension Indicator washer (DTI) The purpose of this washer is to show that a defined preload is achieved in the bolting assembly. 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