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Dry or Lube?
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<blockquote data-quote="Gopher Baroque" data-source="post: 7886198" data-attributes="member: 143141"><p>When a bolt is lubricated - less torque is required to achieve bolt axial load or tension. Reduction of torques for lubricated vs. dry bolts are indicated in the table below.</p><p> </p><table style='width: 100%'><tr><th>Lubricant</th><th>Torque Reduction<br /> <em>(%)</em></th></tr><tr><td>Graphite</td><td>50 - 55</td></tr><tr><td>White Grease</td><td>35 - 45</td></tr><tr><td>SAE 30 oil</td><td>35 - 45</td></tr><tr><td>SAE 40 oil</td><td>30 - 40</td></tr><tr><td>No lube</td><td>0</td></tr></table> <table style='width: 100%'><tr><th></th></tr></table><p><a href="https://www.engineeringtoolbox.com/torque-lubrication-effects-d_1693.html" target="_blank"><em>https://www.engineeringtoolbox.com/torque-lubrication-effects-d_1693.html</em></a></p><p></p><p>On the other hand, according to data collected and analyzed by Shigley and Mischke, there is not a correlation to an average difference in torque to tension of dry vs. lubricated fasteners. What the data indicated was that lubed fasteners acheive a desired preload at a much more consistent torque value. Applied torques on "Dry" fasteners on average yield roughly the same preload, but there is a much greater deviation from that mean or average value from dry fastener to dry fastener vs. lubed fastener to lubed fastener. If you are looking to control preload in fasteners to a tighter range, then lubricating them prior to torque will give more predictable results, not higher values compared to dry conditions - according to Shigley and Mischke.<em> <a href="https://www.eng-tips.com/viewthread.cfm?qid=173061" target="_blank">https://www.eng-tips.com/viewthread.cfm?qid=173061</a></em></p><p></p><p>Manufacturers, engineers and other industry experts seem to unanimously oppose using lubrication. On the other hand, some DIYers and self-appointed Internet forum experts claim to have used thread lube since the very dawn of time with nary a problem.</p></blockquote><p></p>
[QUOTE="Gopher Baroque, post: 7886198, member: 143141"] When a bolt is lubricated - less torque is required to achieve bolt axial load or tension. Reduction of torques for lubricated vs. dry bolts are indicated in the table below. [TABLE] [TR] [TH]Lubricant[/TH] [TH]Torque Reduction [I](%)[/I][/TH] [/TR] [TR] [TD]Graphite[/TD] [TD]50 - 55[/TD] [/TR] [TR] [TD]White Grease[/TD] [TD]35 - 45[/TD] [/TR] [TR] [TD]SAE 30 oil[/TD] [TD]35 - 45[/TD] [/TR] [TR] [TD]SAE 40 oil[/TD] [TD]30 - 40[/TD] [/TR] [TR] [TD]No lube[/TD] [TD]0[/TD] [/TR] [/TABLE] [TABLE] [TR] [TH][/TH] [/TR] [/TABLE] [URL='https://www.engineeringtoolbox.com/torque-lubrication-effects-d_1693.html'][I]https://www.engineeringtoolbox.com/torque-lubrication-effects-d_1693.html[/I][/URL] On the other hand, according to data collected and analyzed by Shigley and Mischke, there is not a correlation to an average difference in torque to tension of dry vs. lubricated fasteners. What the data indicated was that lubed fasteners acheive a desired preload at a much more consistent torque value. Applied torques on "Dry" fasteners on average yield roughly the same preload, but there is a much greater deviation from that mean or average value from dry fastener to dry fastener vs. lubed fastener to lubed fastener. If you are looking to control preload in fasteners to a tighter range, then lubricating them prior to torque will give more predictable results, not higher values compared to dry conditions - according to Shigley and Mischke.[I] [URL]https://www.eng-tips.com/viewthread.cfm?qid=173061[/URL][/I] Manufacturers, engineers and other industry experts seem to unanimously oppose using lubrication. On the other hand, some DIYers and self-appointed Internet forum experts claim to have used thread lube since the very dawn of time with nary a problem. [/QUOTE]
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