Does Loctite Cause Helicoils to Fail During Screw Removal?

  • Thread starter Thread starter PhillipK
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SUMMARY

The discussion centers on the use of Loctite thread lockers on screws installed in M2.5 Helicoil STI holes, which leads to the Helicoil being removed with the screw upon disassembly. The recommendation to switch to locking Helicoils has been ignored by the customer, resulting in logistical challenges for reinstallation. Helicoil does not provide documentation against using Loctite, but they advise using locking Helicoils instead. The specific Loctite products mentioned are Red 271 for permanent locking and Blue 242 for applications requiring disassembly.

PREREQUISITES
  • Understanding of Helicoil installation and removal processes
  • Familiarity with Loctite thread locker products, specifically Red 271 and Blue 242
  • Knowledge of engineering drawing specifications and modifications
  • Experience with logistical challenges in manufacturing and assembly
NEXT STEPS
  • Research the specifications and benefits of locking Helicoils
  • Investigate the technical data sheets for Loctite Red 271 and Blue 242
  • Explore case studies or tests regarding the impact of thread lockers on Helicoil performance
  • Review best practices for modifying engineering drawings to include locking mechanisms
USEFUL FOR

Manufacturing engineers, assembly technicians, and quality assurance professionals involved in the installation and maintenance of Helicoils and threaded fasteners.

PhillipK
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We have a customer who insist's on applying loctite on screws before installing them in standard M2.5 Helicoil STI holes. The problem is if they need to remove the screw the Helicoil comes out with the screw. We have recommended that they make a change to the drawing to call out for locking Helicoils but it would appear they have ignored this advise. We end up re-installing new Helicoils which is a logistical nightmare as the customer is in singapore.

Question: Is there any documentation I can get my hands on to convince them that Loctite should not be used on Helicoils they may need to be removed at some point in the future. I have contacted Helicoil and while they will tell you not to do it they have no documentation to support the position, they just make the same recommendation that we do, to switch to locking Helicoils.

Any help would be welcome

Phillip
 
Engineering news on Phys.org
Quote Helicoil's recommendation, or commission a test to prove that Loctite isn't necessary.
 
use loctite thread locker RED 271 to permanently lock the helicoil
use loctite thread locker Blue 242 on bolt as this is used where disassembly to service is required but still want to "lock " the bolt in
 

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