Thread Engagement?

[smhammen]

I'm threading an aluminum tube with a M60x2 thread. I want to use a steel retaining nut but I'm wondering how much thread engagement I need to keep my 14,000 lb load from shearing the threads clean off on the aluminum tube. The typical 1-1.5 diameter rule or 5 threads doesn't seem to apply here. Any thoughts?
Thanks!

 

[KENAT]

I'm pretty sure the equation you need is around here somewhere.

You might be able to validate your result on

http://www.boltplanet.com

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[KENAT]

http://www.eng-tips.com/faq.cfm?pid=725

may have what you need.

Posting guidelines faq731-376

http://eng-tips.com/market.cfm?

(probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​

 

[racookpe1978]

Are you sure the aluminum to steel problem in each thread won't cause failure?

 

[hydtools]

Typically the thread shear area is calculated using the pitch diameter of the thread. Calculate the thread shear area per unit length engagement. Use your material's shear strength to calculate load per unit thread engagement. Apply a design factor based on your knowledge of the loading. Calculate the final thread engagement length required.

Ted

 

[desertfox]

Hi smhammen

Have a look at this site:-

http://www.engineersedge.com/thread_strength/thread_minimum_length_engagement.htm

desertfox

 

[CoryPad]

Here are some of the equations used for calculating thread engagement:

thread725-35222

 

[chris9]

Machinery's Handbook 28th Edition is an excellent reference for thread stripping calculations.

Chris

http://www.value-design-consulting.co.uk