The Elsmar Cove Business Systems and Standards Discussion Forums Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum
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# Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum

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Post Number #1
13th June 2012, 09:19 AM
 bills5 Total Posts: 2
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?

Post Number #2
14th June 2012, 04:26 AM
 Stijloor Total Posts: 15,186
Re: Computing Failure Torque of 6061-t6 Aluminum Threads

A Quick Bump!

Can someone help?

Thank you very much!!
Post Number #3
14th June 2012, 01:23 PM
 Mikishots Total Posts: 879
Re: Computing Failure Torque of 6061-t6 Aluminum Threads

Quote:
 In Reply to Parent Post by bills5 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
14th June 2012, 01:38 PM
 Jim Wynne Total Posts: 14,159
Re: Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum

Quote:
 In Reply to Parent Post by bills5 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
14th June 2012, 01:53 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
14th June 2012, 06:29 PM
 Mikishots Total Posts: 879
Re: Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum

Quote:
 In Reply to Parent Post by bills5 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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