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8.8

ME or Physicist Type Query from a Semi-Ignorant EE

Asked by Aramis11 in Math & Science

Tags: torque, stripe

Working an issue in which design engineering applies MMM-A-132 Type I Class 3 aircraft structural adhesive across bolt heads as a torque stripe.  The bolts are NAS1351N3, 10-32 UNJF-3A, in case it matters.  At one point, another stripe (F900 Torque Seal) was added to a derived overhaul publication via the assertion that color media was no longer available in the material but the original compound, deemed inadequately visible, needed to be retained for its 'staking' function.  Thread locking compound such as Loctite C is used in this application.  Some research findings have suggested that similar bolt head striping is used in other designs, but it is not entirely clear what is the intent or effectiveness other than visible indication that the bolt position is disturbed.  My initial impression has been that with conditions capable of backing bolts out against thread locking compounds, any ‘staking’ applied short of welding the bolt heads in place will not have any appreciable effect.

Is this bolt ‘staking’ concept valid, or is the MMM-A-132 material applied really only a torque stripe?
[+][-]02/09/05 01:19 PM, ID: 13269281Accepted Solution

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About this solution

Zone: Math & Science
Tags: torque, stripe
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Solution Provided By: grg99
Participating Experts: 2
Solution Grade: B
 
[+][-]02/09/05 05:21 PM, ID: 13271172Expert Comment

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[+][-]02/10/05 06:36 AM, ID: 13275503Author Comment

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[+][-]04/20/05 06:54 AM, ID: 13824323Author Comment

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