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Related Topic Tags
aluminum (general topics), threads (of fasteners such as nuts and bolts), torque, torque specifications or requirements
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  #1  
Old 13th June 2012, 09:19 AM
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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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Old 14th June 2012, 04:26 AM
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Re: Computing Failure Torque of 6061-t6 Aluminum Threads

A Quick Bump!

Can someone help?

Thank you very much!!
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Old 14th June 2012, 01:23 PM
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Re: Computing Failure Torque of 6061-t6 Aluminum Threads

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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.

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Old 14th June 2012, 01:38 PM
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Re: Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum

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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.

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Old 14th June 2012, 01:53 PM
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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.
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Old 14th June 2012, 06:29 PM
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Re: Computing Failure Torque for Helicoil Threads in 6061-T6 Aluminum

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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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