Loctite

Loctite Threadlocker Blue 242 Review

4.8 / 5 · our rating

Reviewed by Brian Scott · Published

Discover the effectiveness of Loctite Threadlocker Blue 242 for securing fasteners and preventing rust. Ideal for various applications and easy to use.

Loctite Threadlocker Blue 242 Review

The verdict

Loctite Threadlocker Blue 242 is a reliable and effective solution for securing fasteners.

Why we recommend it

Lock and Seal Fasteners: Prevents loosening of metal fasteners caused by vibration on small motors, mowers, and power eq

Prevents Rust and Corrosion: Protects from leaks, rusting, and corrosion and eliminates need to stock up on expensive lo

Removable: Can be removed with hand tools

Easy and Quick: Sets in 10 minutes and fully cures in 24 hours

For 6-19mm Fasteners: Medium-strength formula for use on threads for 6mm to 19mm nuts and bolts

Pros

  • Prevents loosening from vibration
  • Protects against rust and corrosion
  • Easy to apply and quick setting time
  • Removable with hand tools
  • Cost-effective alternative to lock nuts

Cons

  • Some users find it runny
  • May not work well on highly active substrates

Gallery

Full review

Overview Loctite Threadlocker Blue 242 is a medium-strength adhesive designed to lock and seal threaded fasteners, providing a reliable solution for preventing loosening due to vibration. With a stellar rating of 4.8 out of 5 stars based on over 43,000 reviews, this product has established itself as a trusted choice for both professional and DIY applications. It is particularly effective for use on small motors, mowers, and various types of power equipment, making it a versatile addition to any toolkit.

Key Features One of the standout features of Loctite Threadlocker Blue 242 is its ability to lock and seal fasteners, preventing them from loosening under the stress of vibration. This is especially crucial for components in small motors and power equipment, where even slight movement can lead to significant issues. The product is designed for nuts and bolts ranging from 6 mm to 19 mm, which covers a wide variety of applications.

In addition to its locking capabilities, this threadlocker protects against rust and corrosion, effectively sealing the threads to prevent leaks. This eliminates the need for stocking up on expensive lock nuts and washers, providing a cost-effective solution for securing fasteners.

Moreover, the medium-strength formula of Loctite Threadlocker Blue 242 allows for easy disassembly with hand tools, which is an essential feature for maintenance and repairs. The adhesive sets in just 10 minutes and cures fully in 24 hours, making it quick and convenient to use in various situations.

Who Is It For This product is ideal for anyone who works with threaded fasteners, from professional mechanics to DIY enthusiasts. If you often engage in tasks involving small motors, lawnmowers, bicycles, or other equipment that utilizes nuts and bolts, Loctite Threadlocker Blue 242 is a must-have. Its ease of use and reliability make it suitable for both casual users and those who require a dependable adhesive solution for more complex projects.

Final Verdict In conclusion, Loctite Threadlocker Blue 242 is a highly effective thread-locking adhesive that fulfills its promises of preventing loosening, rust, and corrosion. Its easy application and quick setting time make it a valuable addition to any toolbox, whether you're a professional or a casual user. With its strong performance and positive customer feedback, this product is undoubtedly worth considering for your next fastening project.

Specifications

Specific Uses For ProductThreadlocker
Item FormLiquid
Other Special Features of the ProductStrong
Container TypeTube
Viscosity LevelMedium
Full Cure Time24 hours
Water Resistance LevelWater Resistant
Tensile Strength110 pounds_per_inch
Compatible MaterialMetal
Item Package Quantity1
Volume6 ml
Material TypeDimethylacrylate ester
ColorBlue
Brand NameLoctite
ModelHenkel / osi -tanch-it-
Unit Count1 Count
UPC079340242005
Number of Pieces1
Global Trade Identification Number00079340242005
ManufacturerHenkel Corporation
Included ComponentsLoctite Heavy Duty Threadlocker, 0.2 oz, Blue 242, Single
Item Type NameBlue 242
Item Weight5 g
Part Number209728
Warranty DescriptionWarranty
Best Sellers Rank#36 in Automotive (See Top 100 in Automotive)#1 in Thread Lock Sealers
ASINB000I1RSNS
Customer Reviews4.8 4.8 out of 5 stars (43,033) 4.8 out of 5 stars

What buyers say

4.8 · 5 reviews

Loctite is always reliable. It keeps bolts from vibrating loose but still allows them to be removed when needed. I’ve used it on my dirt bike and other equipment with great results. Easy to apply, works exactly as advertised, and it’s a must-have in any toolbox.

Jesse F. · 2026-07-24

With all the biking i do, I grabbed this blue loctite to keep rack and bottle cage bolts from backing out. I just dab a tiny drop on each screw, twist it in, and it stays put but still comes off with a regular wrench. Cheap tube, works well, glad I tossed it in my toolbox.

M. Christipher Williamson · 2026-06-09

Exactly what i toss in my daypack for trailhead repairs. I grabbed this Loctite because the bolts on my trekking poles and my bike rack kept rattling loose on washboard forest roads. One pea-sized drop on each bolt of my rack and those things stayed snug the whole 3 hour drive to the mountains. I still pop them loose with a normal wrench when i need to tweak the setup, so it’s not a fight. Tube is tiny but it goes a long way. The best part was tightening my wobbly camp chair and having it stay tight the whole weekend insteaad of sinking mid-s’more.

Karina · 2026-06-07

Genuine product and works great. I definitely will purchase again.

Gabriel Formanek · 2026-07-12

Loctite Blue 242 is basically the secret sauce for anyone tired of screws slowly working themselves loose and falling out like they’ve given up on life. This stuff is the perfect middle ground: strong enough to keep things tight, but not so strong that you need a blowtorch to undo your mistakes later.I picked it up because my daughter’s desk chair kept losing its bolts. Every few days she’d sit down and the whole thing would wobble like it was auditioning for a comedy sketch. Tighten, loosen, repeat — super annoying. One tiny dab of Blue 242 on each bolt and suddenly the chair is as solid as if it came out of the box yesterday. No more surprise acrobatics.Why I like it:It just works. Simple, reliable, and zero drama.Removable without a fight. Hand tools are enough — no heat, no swearing.A little goes a long way. One tube feels like it’ll survive the apocalypse.Great for anything that vibrates loose. Perfect for chairs, bikes, small engines, you name it.

Steven · 2026-02-06

Frequently asked questions

How long does it take for Loctite Threadlocker Blue 242 to cure?+

Loctite Threadlocker Blue 242 sets in 10 minutes and fully cures in 24 hours.

Can I remove the fasteners after using this product?+

Yes, Loctite Threadlocker Blue 242 allows for removal with hand tools, making it suitable for applications where disassembly is needed.

What sizes of fasteners can I use this on?+

This threadlocker is designed for use on nuts and bolts ranging from 6 mm to 19 mm.

Is this product resistant to rust and corrosion?+

Yes, it protects against rust and corrosion, sealing the threads effectively.

Where can I use Loctite Threadlocker Blue 242?+

It is ideal for small motors, mowers, bicycles, and various power equipment.

About the reviewer

BS

Brian Scott

Automotive Editor

Brian reviews car products and accessories with a focus on quality and value.

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