How to Choose a LOCTITE® Threadlocker

When choosing a threadlocker, there are four things to consider:

1、Strength

●  Low Strength (Purple): Ideal for fasteners <1⁄4" (6 mm). Easy disassembly using hand tools

●  Medium Strength (Blue): Designed to be removable with standard hand tools on 1⁄4" to 3⁄4" fasteners

●  High Strength (Red): Designed to deliver high strength on 1⁄4" to 3⁄4" (6 mm to 22 mm) fasteners. For removal, it may require localized heat (>550°F/260°C), hand tools, and disassembly while hot

2、Viscosity

●  Liquid Formulas: Everyday assembly; ideal for fine threads and blind holes

●  Semisolid Formulas: Pocket-friendly, ideal for overhead applications

●  Tape Formula: Pocket-friendly; controlled application; can be pre-applied several days before assembly

3、Application Methods

●  Pre-Applied: QuickTape threadlocker can be applied beforehand on bolts that are waiting to be assembled

●  Pre-Assembly: Most LOCTITE® liquid threadlockers are designed to be applied at the moment that parts will be assembled

●  Post-Assembly: Wicking grade formula can be applied on parts that are already assembled

4、Materials Being Assembled

●  All LOCTITE® Threadlockers: Metal-to-metal applications

●  LOCTITE® 425 Assure: Plastic-to-plastic, plastic-to-metal applications

References: https://www.henkel-adhesives.com/us/en/products/industrial-adhesives/threadlockers.html