How to Estimate the Bending Moment Under a Bolt Flange?

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Anonymous Poster #1	How to Estimate the Bending Moment Under a Bolt Flange? 07/23/2025 7:05 AM
	Dear Colleague Engineers: Would you help to provide me a formula or method to estimate the bending moment under a bolt head in an eccentric loading condition, when the torque is known? Thank you!
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rwilliams Guru Join Date: Jul 2016 Posts: 1377 Good Answers: 105	#1 Re: How to Estimate the Bending Moment Under a Bolt Flange? 07/24/2025 10:02 PM
	Maybe if you rephrased the question or gave an example of what you are talking about, you might get an answer. What is the bolt flange, and what is under it?
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Catherinek Participant Join Date: Jul 2025 Posts: 2	#2 In reply to #1 Re: How to Estimate the Bending Moment Under a Bolt Flange? 07/24/2025 10:13 PM
	Bolt is fixed to a sheet metal made of steel or aluminum
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rwilliams Guru Join Date: Jul 2016 Posts: 1377 Good Answers: 105	#3 In reply to #2 Re: How to Estimate the Bending Moment Under a Bolt Flange? 07/24/2025 10:35 PM
	You want to know the bending moment in the sheet under the head of the bolt? How is the force applied? A real world example might be easier to describe….
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Catherinek Participant Join Date: Jul 2025 Posts: 2	#4 In reply to #3 Re: How to Estimate the Bending Moment Under a Bolt Flange? 07/24/2025 11:26 PM
	I want the formula for estimating bending moment under bolt head which is fixed to a sheet metal on eccentric loading condition.
	Reply Off Topic (Score 5)

dkwarner Guru Join Date: May 2006 Location: Placerville, CA (38° 45N, 120° 47'W) Posts: 6216 Good Answers: 248	#5 In reply to #4 Re: How to Estimate the Bending Moment Under a Bolt Flange? 07/24/2025 11:58 PM
	A drawing is worth many words! A bending moment needs a fulcrum and a lever. Show us where they are with respect to the bolt, and perhaps we can help... __________________ Teaching is a great experience, but there is no better teacher than experience.
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Doorman Guru Join Date: Apr 2009 Location: Yellowstone Valley, in Big Sky Country Posts: 7426 Good Answers: 295	#6 Re: How to Estimate the Bending Moment Under a Bolt Flange? 07/25/2025 11:48 AM
	Confusing… Do you mean like this? Or, like this? __________________ Semper Ubi Sub Ubi
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StandardsGuy Guru Join Date: Dec 2006 Location: North America, Earth Posts: 4528 Good Answers: 106	#7 Re: How to Estimate the Bending Moment Under a Bolt Flange? 08/02/2025 8:24 AM
	Perhaps you can find something here: https://www.calctown.com/ __________________ “I would rather have questions that can't be answered than answers that can't be questioned.” - Richard Feynman
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