Loctite Threadlocker Blue 242 - Removable Thread Lock Glue for Nuts, Bolts, & Fasteners, Medium Strength Screw Glue to Preven

About this product

Loctite Threadlocker Blue 242 is a medium-strength anaerobic adhesive formulated to prevent metal fasteners from loosening due to vibration and shock. It is designed for standard 1/4-inch to 3/4-inch automotive nuts and bolts, sealing threads against corrosion while remaining removable with hand tools. This makes it ideal for DIY mechanics working on cars, motorcycles, and power equipment.

Best for

Mechanics securing standard vehicle fasteners subject to vibration

What works well

• ✓Prevents fasteners from loosening due to automotive shock and vibration
• ✓Disassembles easily using standard hand tools without applying heat
• ✓Seals metal threads to prevent rust and corrosion lockup

Worth knowing

• iRequires up to 24 hours for a complete full-strength cure
• iUnsuitable for high-temperature applications like exhaust manifolds

Bottom line

A reliable choice for standard automotive repairs, though high-heat or extreme-duty components require stronger threadlockers.