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Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum

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aluminum (general topics), threads (of fasteners such as nuts and bolts), torque, torque specifications or requirements
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  Post Number #1  
Old 13th June 2012, 10:19 AM
bills5

 
 
Total Posts: 2
Please Help! Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum

Can anyone tell me how to compute the maximum allowable torque for a 4-40 helicoil (.112 nominal length) in 6061-t6 aluminum?

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  Post Number #2  
Old 14th June 2012, 05:26 AM
Stijloor's Avatar
Stijloor

 
 
Total Posts: 14,703
Re: Computing Failure Torque of 6061-t6 Aluminum Threads

A Quick Bump!

Can someone help?

Thank you very much!!
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  Post Number #3  
Old 14th June 2012, 02:23 PM
Mikishots's Avatar
Mikishots

 
 
Total Posts: 851
Re: Computing Failure Torque of 6061-t6 Aluminum Threads

Quote:
In Reply to Parent Post by bills5 View Post

Can anyone tell me how to compute the maximum allowable torque for a 4-40 helicoil (.112 nominal length) in 6061-t6 aluminum?
Don't know about calculating it, but the website states that the maximum is 48 oz-in for a 4(.112)-40 Heli-coil insert.
  Post Number #4  
Old 14th June 2012, 02:38 PM
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Jim Wynne

 
 
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Re: Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum

Quote:
In Reply to Parent Post by bills5 View Post

Can anyone tell me how to compute the maximum allowable torque for a 4-40 helicoil (.112 nominal length) in 6061-t6 aluminum?
Welcome to the Cove.

I don't think there's any way to calculate the value because of the variables involved--thickness of material, the integrity of the existing threads, proper insertion of the Helicoil, etc.
  Post Number #5  
Old 14th June 2012, 02:53 PM
bills5

 
 
Total Posts: 2
Re: Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum

i believe the 48in oz. given is the locking torque that the locking feature of the helicoil exerts on the inserted screw. (you'll notice that this number decreases with the number of insertions due to the fact the locking feature is spring-like and wears.
  Post Number #6  
Old 14th June 2012, 07:29 PM
Mikishots's Avatar
Mikishots

 
 
Total Posts: 851
Re: Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum

Quote:
In Reply to Parent Post by bills5 View Post

i believe the 48in oz. given is the locking torque that the locking feature of the helicoil exerts on the inserted screw. (you'll notice that this number decreases with the number of insertions due to the fact the locking feature is spring-like and wears.
Agreed. I have also noticed that the chart only shows the torques for stainless steel - I missed that important note.
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