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  • Custom bolt tensioners take the stress off users
    fasteners can prevent such failures. Here, tension rather than torque is becoming the preferred method to tighten fasteners because it gives more accurate and repeatable loads. It works like this: A stud tensioner hydraulically applies a tensile load to a bolt or stud. The tensioner maintains this load
  • What is Torque?
    efficiency and will resist coming undone. However, if the tension is too low, the nut could vibrate or work loose. If the tension is too high (overstretched), the bolt could break. Ever y bolt has a correct optimum torque/tension figure for each fastening application. It is important to have these figures
  • What is Torque?
    Torque is a 'turning' or 'twisting' force and differs from tension which is created by a straight pull. However, torque is used to create tension. How? As the nut and bolt are tightened the two plates are clamped together. The thread angle in the bolt converts the force applied into tension
  • Application Note: Bolt Fastening for Aerospace & Manufacturing
    An Aerospace Company was working on a test plan that involved taking torque & compression measurements on fasteners with varying joint materials. The system required both high and low sampling rates, in addition to the capability of precisely measuring force and torque simultaneously. They required
  • Learn the Basics of Torque Wrenches
    The torque wrench's main purpose: to tighten a bolt or nut with the correct amount of torque while avoiding over-tightening.
  • Coatings and Torque Tension
    In an automated installation, the most positive way to insure proper clamp is with machines that read torque rate of change and angle curve. This reads both the mechanical properties of the bolt and the properties of the joint, assuring no broken bolts with correct clamp and yield. These machines
  • Tightening Bolted Joints with Torque Tools
    determination of the tightening torque can be established by measurement of bolt extension, strain gauges or by the use of a load cell embedded in the joint. Specify a Tightening Sequence: The majority of joints consist of more than one bolt and bring together surfaces that are not completely flat
  • Hydraulic Torque Wrenches...It's All about the Right Prestress
    In several branches of industry high demands are made with regard to (heavy) bolted joints. To achieve this a precision tool is required which provides the certainty of a good joint, but especially the correct bolt prestress. The appropriate tool for this purpose is a hydraulically driven torque
  • The 'Friction Flaw' with Fastener Torque Settings Charts
    words, the true way to measure the force exerted on the fastener shank, that holds the joint together, is to monitor how much the bolt has been stretched. Only DTI SmartBolts (R) use fastener elongation to visually indicate whether a bolted joint is within design tension (within +/-10%). DTI SmartBolts
  • Understanding the Nut Factor in Threaded-Fastener Torque-Tension Relationship
    Engineers use a "nut factor " to relate a bolt's installation torque to the tension on it. But they need to understand the friction-related variables that contribute to the nut factor to accurately design bolted joints. * The experimentally determined nut factor, , consolidates the friction effects

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