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  • 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
  • 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
  • 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
  • Performing the Marking Torque Test Method
    Controlling torque is a critical element for tightening threaded fasteners. Validating that a screw or bolt is properly installed ensures quality performance and reduces failures. The process to measure torque is relatively easy. It can be conducted either dynamically during the fastening process
  • Tightening Bolted Joints with Torque Tools
    and the bolts preload. A calibrated torque tool should therefore be used for the final tightening operation or inspection. Specify the correct tightening torque: Whenever feasible, specify the tightening torque based upon actual test results rather than a theoretically calculated value. Experimental
  • 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
  • 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
  • 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
  • Four Things Engineers Must Know About Locking Fasteners to Keep Their Products and Careers in the Fast Lane
    in the fast lane. 1) Focus on retaining fastener tension, not torque assembly methods. Bolt tension, which causes the bolt to stretch, is what actually keeps a joint together. Yet 90% of the torque applied to a bolted joint goes not into fastener tension, but into overcoming friction. This is one reason
  • Bolted Joint Uncertainties
    affect the tension created by applying torque to a single bolt, and more than 250 variables come into play in a group of bolts. Many of these variables can be identified, but they rarely can be characterized for a production lot. Through testing and experience, some industries can quantify the loads

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