When & Where You Should Use Loctite

Published on April 11, 2026
Duration: 2:06

This guide explains the proper use of threadlocker on firearm accessories. It emphasizes using threadlocker on fasteners for items like optics and flashlights to prevent them from loosening due to recoil and vibration. The video recommends using blue Loctite for most applications, as it provides a secure hold while allowing for disassembly with basic tools. Red Loctite is noted as requiring heat for removal, and purple is suggested for very small screws.

Quick Summary

Blue Loctite is the recommended threadlocker for most firearm accessories, including optics, as it securely holds fasteners against vibration and recoil while still allowing for disassembly with basic tools. Red Loctite is stronger and requires heat, while purple is for very small screws. Using proper threadlocker prevents components from loosening and maintains zero.

Chapters

  1. 00:00Introduction: The Loctite Dilemma
  2. 00:31Why Use Loctite on Firearms?
  3. 00:48Where to Apply Loctite (Accessories)
  4. 00:53Optics and Fastener Security
  5. 01:09Recoil and Vibration Effects
  6. 01:24Choosing the Right Loctite Type
  7. 01:27Blue Loctite: The Go-To
  8. 01:29Red Loctite vs. Blue Loctite
  9. 01:37Purple Loctite for Small Screws
  10. 01:46General Recommendation for Accessories
  11. 01:51Warning: Unreliable Adhesives

Frequently Asked Questions

What type of Loctite is best for firearm accessories like optics?

For most firearm accessories, including optics, blue Loctite is recommended. It provides a secure hold against vibration and recoil but allows for disassembly with basic tools. Red Loctite is stronger and typically requires heat to remove, while purple is for very small screws.

Why is Loctite important for firearm screws?

Firearms experience significant recoil and vibration during use. These forces can cause standard threaded fasteners to loosen over time, potentially leading to lost zero on optics or components detaching, rendering the firearm inoperable or unsafe.

Can I use any type of glue on my firearm screws?

No, it's crucial to use specific threadlockers like Loctite, not general adhesives like super glue or craft glues. Using the wrong product can permanently bond parts, making disassembly impossible without damage, or fail to provide adequate security against vibration.

What happens if optic screws loosen on a firearm?

If screws securing an optic loosen, the firearm will likely lose its zero, meaning the point of aim will no longer match the point of impact. In severe cases, the optic could detach entirely, making the firearm difficult or impossible to aim accurately.

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