A guide for selecting and applying Loctite threadlockers to secure bolts and nuts in aircraft and mechanical applications, covering product strengths…
This document provides guidance on selecting the appropriate Loctite threadlocker based on fastener size, strength requirements, and environmental conditions. It emphasizes that vibration causes loosening over time and recommends using Loctite products on all metal-to-metal contact surfaces for preventative maintenance.
The guide details specific product lines including purple low-strength (222), blue medium-strength (242), red permanent/high-temp options (262, 272, 277), and green wicking formulas (290). It includes technical specifications such as temperature ranges (-65 to 300°F or up to 450°F for specific models), cure times, and disassembly methods.
| Temperature Range (Standard) | -65 to 300 degrees F. |
|---|---|
| Temperature Range (272 Red) | -65 to 450 degrees F. |
| Full Cure Time | 24 hours |
| Fastener Size Limit (Blue) | up to 3/4" |
No, unless you have a specific reason. Blue is generally the best choice because Red locks bolts and nuts permanently.
No, do not bother applying it there because the tightness of these bolts needs to be checked all the time.
They all require 24 hours to cure fully, though initial set times vary by product.