Loctite
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Choosing a Loctite threadlocker
Strength is a decision about how the fastener will come apart: purple 222 for small screws removed by hand, blue 242 / 243 for general nuts and bolts removed with normal tools (243 tolerates lightly oily parts), and red 271 for permanent assemblies that need heat to undo.
Applying it
- Clean and dry the threads; oil reduces strength (243 is the more forgiving choice).
- Apply a few drops where the nut will sit on the bolt, not on the end of the thread.
- Assemble and torque as normal. Parts handle within minutes; full strength builds over about 24 hours at room temperature.
Loctite 401 is an instant adhesive for bonding small parts, not a threadlocker. See the full lubricants range, including WD-40 for freeing seized fasteners, or order through the quote request page.
Frequently asked questions
Which Loctite is easiest to remove?
Purple 222 (low strength) comes off with hand tools; blue 242 / 243 with normal tools; red 271 needs heat.
How long does Loctite take to cure?
Parts can usually be handled within minutes; full strength builds over about 24 hours at room temperature.
Is Loctite 401 a threadlocker?
No, 401 is an instant adhesive for bonding parts.