3M Scotch-Weld Blue Threadlocker TL42 & TL43, Medium Strength

3M Scotch-Weld blue threadlockers are medium-strength grades for fasteners that need to stay tight under vibration but come apart with standard hand tools during maintenance. Both TL42 and TL43 come in 10 mL, 50 mL, and 250 mL bottles for everything from tool crib stock to production line refills. See Red Threadlocker for high-strength grades on fasteners that need a permanent hold.