Gandbox Training - How to Torque Fasteners, Session 1
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This document provides guidelines on how to properly torque fasteners, emphasizing the importance of using a torque wrench and adhering to specified torque values. Key points include avoiding over-torquing and under-torquing to prevent fastener damage or loosening, as well as ensuring proper lubrication when necessary. It also outlines different failure modes of fasteners and advises against reusing fasteners that have been improperly installed.
Gandbox Training - How to Torque Fasteners, Session 1
- 1. How to Torque Fasteners? “GANG BOX TRAINING” General Rules which must be followed: • A torque wrench is used where the tightness of screws and Fasteners is crucial. 1. Never over torque a Fastener. To over-torque a • It allows the operator to measure the torque Fastener can cause it to stretch beyond normal limits causing Fastener breakage, or loosening applied to the fastener so it can be matched to of Fastener the specifications for a particular application. 2. Never under torque Fasteners because it can This permits proper tension and loading of all cause the Fastener to loosen to break parts. 3. Ensure you know the torque specification 4. Ensure you know the torque specification if you How to Torque a Fastener? are using a Fastener with lubricant on it or dry 5. As a general rule Fasteners should be lubricated unless manufacturer states otherwise Using the most common torque wrench which is a 6. Know how to use a torque wrench. When all else “click type” follow these steps; fails read the instructions. Step 1: Preset torque value on torque wrench as 7. When unsure whether a Fastener should be determined by the equipment manufacturer; or if not torque to a specification, torque it available a common torque specification chart. (see 8. Do not re-use a Fastener if: below) - If it was installed with an impact wrench - If it could result in a safety risk Fastener Failure Modes: • Overloading – Force exceeds Fastener strength, Fastener loosens or shears • Over-Torque - damaging the threads and deforming the hardware • Under-Torque - allowing a joint to come loose. It may also allow the joint to flex and thus fail under fatigue. • Brinelling – caused by poor quality washers, leading to a loss of clamp load and failure of the Note: When using anti-seize reduce lube torque joint value by 20% • Corrosion – caused by the disintegration of an engineered material due to electrochemical Step 2: Torque the Fastener to the point where the oxidation of metals in reaction with an oxidant desired torque is reached, signaling the desired such as oxygen, this is why Fasteners must be torque by causing a click sound (some torque lubricated unless stated by the equipment wrenches will not allow a Fastener to be torque manufacturer. above the setting however some will, be sure and Definitions: purchase the best torque wrench possible) Torque Wrench: If you have questions send me an email at • A torque wrench is a tool used to precisely apply rsmith@gpallied.com a specific torque to a fastener such as a nut or Fastener. Page 1 of 1 GPAllied 4360 Corporate Road Suite 110 www.gpallied.com Charleston, SC 29405 Office (843) 414-5760 Fax (843) 414-5779