How Much Does Lubrication Affect Torque Readings
"25% less torque (compared to dry) on fasteners lubricated with anything"
08-03-20, 02:35 PM
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"25% less torque (compared to dry) on fasteners lubricated with anything"
After my experiment, I looked at bolt manufacturer data and institute they generally recommend roughly 25% less torque (compared to dry out) on fasteners lubricated with annihilation (oil, grease, etc.) and roughly 40% less torque on fasteners coated in anti-seize compound.
Full article: https://forum.ih8mud.com/threads/emmet...-bolts.604971/
I've read in multiple reviews of torque wrenches where the person goes to recommended torque and strips the commodities. They assume the wrench is faulty, but information technology could be thread lubrication skewed the torque reading.
Anti-seize is apparently even more lubricating than basic grease.
08-03-xx, 03:03 PM
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Information? There are many kinds of anti-seize, some incorporate copper, some nickel, some a combination, others MoS2 and others have PTFE or like. I practise non think they all deed the aforementioned, best not to generalize.
08-03-xx, 04:05 PM
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Originally Posted by dsbrantjr 
Data? There are many kinds of anti-seize, some contain copper, some nickel, some a combination, others MoS2 and others have PTFE or similar. I do not think they all deed the same, all-time not to generalize.
Instead, upliftingly, I took Ajax�s advice, which is to reduce the recommended associates torque by 30 per cent for fasteners in that more than heavily lubricated land. I�d expect one of the earth�s leading bolt manufacturers to know their **** and get it right in their Fastener Handbook for Bolt products, which you lot tin download independently and confirm.
My understanding is any anti-seize at the fourth dimension of awarding is more lubricating than grease because the solids are very finely ground.
Hither'due south the link: https://autoexpert.com.au/posts/ulti...ickle-graphite
08-03-20, 04:xiii PM
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I've read, that in some disquisitional places, tightening torque is specified in degrees of rotation
08-03-20, 04:19 PM
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Does the contrary utilize when tightening a bolt with thread-lock?
08-03-20, 05:18 PM
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Originally Posted by Pratt
I've read, that in some critical places, tightening torque is specified in degrees of rotation
In some critical uses, the amount of stretch of the bolt is measured directly, since the stretch/preload is really what measuring the torque is indirectly inferring.
08-03-20, 05:26 PM
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Originally Posted by RowdyTI
Total article: https://forum.ih8mud.com/threads/pismire...-bolts.604971/
I've read in multiple reviews of torque wrenches where the person goes to recommended torque and strips the commodities. They assume the wrench is faulty, but it could be thread lubrication skewed the torque reading.
Anti-seize is apparently even more lubricating than basic grease.
I'd hazard the issue is really that the thread/bolt being referenced, didn't come with an indicator of whether the torque rating was based on wet vs. dry.
08-03-20, 05:27 PM
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I approximate this is about those pesky thru axles again. JMO, but you are obsessing way too much about this.
08-03-20, 06:56 PM
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We used to have a joke most bolt torque back in the day when I was edifice radio, microwave, and, radar towers out in the middle of nowhere. It went something like this: What's the difference between spot torque and star torque? One is when you tighten something and then hard you see stars! Ha ha. No, really. Y'all have to understand the yield strength of materials before y'all know how to torque fasteners. I rarely if ever get out a torque wrench. Most experienced mechanics empathize how much force it takes to snap a fastener in two. And, they tighten things upward and stop before they reach that betoken. It's really easier the bigger the fastener.
08-03-20, 11:09 PM
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apples oranges Large deviation between torque in cars, jeeps etc and on bicycles....... where most torque is measured in 4 to 8 newton meters 35 or so for casseette lock band I don't affair dropping 5 nm to iii.75 (even if you could do .25) is a good idea for keeping things like restriction cables and handle bars from slipping
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08-03-20, 11:34 PM
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This is "common" cognition. Be conscientious.
While many things accept torque ratings well below yield or some other failure limit, some don't and that extra thirty% becomes very important.
Torque ratings usually presume some regular steel fastener into some regular steel threaded thing.
Side notation, galling stainless steel stinks. Employ anti-seize on stainless when y'all can (and reduce torque past 25% unless otherwise specified).
08-04-xx, 12:45 AM
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Originally Posted by RowdyTI
Full commodity: https://forum.ih8mud.com/threads/ant...-bolts.604971/
I've read in multiple reviews of torque wrenches where the person goes to recommended torque and strips the commodities. They presume the wrench is faulty, but it could be thread lubrication skewed the torque reading.
Anti-seize is apparently even more than lubricating than basic grease.
To my knowledge, any torque spec assumes light lubrication unless otherwise stated. That is unless the bike manufacture has different and unique standards. The assumption may exist you install as delivered, out of box, lubed or not. Its all highly opaque and the source of endless debate, compounded past cheap or excessively fragile parts that break for no reason and confuse users that did torque to recommended spec.
Note the link yous provide talks about anti seize, not Any lubricant. Anti seize is vastly different than lubing a fastener with oil.
Imo, a torque tool stops you torquing more than than the set spec, but it doesnt entirely supersede mutual sense and "manus feel".
Last edited by Racing Dan; 08-04-20 at 01:02 AM.
08-04-20, 12:52 AM
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Originally Posted by Pratt
I've read, that in some critical places, tightening torque is specified in degrees of rotation
This is truthful. You torque to a set value, so turn the fastener an boosted number of degrees. This ensures adequate clamping even if the bolt is binding a chip in the thread.
08-04-20, 07:07 AM
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I utilize a torque wrench on threaded lesser brackets and cassette lock rings - the large stuff - and every matter else is done by feel. Information technology would be stupid to mail a torque value, assuming no lubrication. Zipp stem bolts, for example, are lubed at the manufacturing plant. I put antisieze on all threads. I don't reduce the torque value for it. Another example is SRAM XDR cassettes. There's antisieze on the threads from the factory and a mill torque spec that does not get reduced.
I've been wrenching on carbon fiber parts for 25 years at present and never had a torque related problem.
08-04-20, 07:fifteen AM
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Originally Posted by Pratt
I've read, that in some critical places, tightening torque is specified in degrees of rotation
I measure out in Ugga Duggas.
08-04-20, 03:30 PM
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Annotation the link y'all provide talks about anti seize, not Whatsoever lubricant. Anti seize is vastly unlike than lubing a fastener with oil.
How is anti-seize vastly different than lubing a fastener with oil? Permatex calls their anti-seize a lubricant. It'southward simply an oil base with finely ground soft metal particles. You say "vastly different" so what exactly exercise y'all mean?
This page lists torque coefficients for their anti-seize products: https://www.farnell.com/datasheets/1995733.pdf
"Delight Note: At that place are two "coefficients" used to limited the relationship between torque and tension: torque coefficient (too called "nut factor") is the most commonly used. A unlike concept is the "friction coefficient," which has a value of ii/3 (or 67%) of the torque coefficient."
0.xiii torque coefficient for nickel-graphite anti-seize and 0.18 torque coefficient for aluminum-graphite anti-seize.
Last edited by RowdyTI; 08-04-xx at 03:34 PM.
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How Much Does Lubrication Affect Torque Readings
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