Loctite 290 Medium Strength Threadlocker

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◆ Locks pre-assembled fasteners without taking the joint apart first ● Wicks deep into engaged threads by capillary action, no disassembly required ▲ Also seals porosity in welds, castings and powdered metal parts Ultra-low viscosity of 40 mPa·s draws Loctite 290 between engaged threads by capillary action, locking and sealing fasteners that are already in place. No need to disassemble before applying, simply apply the product and let it wick. Doubles as a porosity sealant for weld seams and cast components, with medium-to-high strength retention from -55 to +150°C. People Also Ask — Loctite 290 Medium Strength Threadlocker Q: Can Loctite 290 be applied to fasteners that are already assembled? Yes — its wicking-grade formula flows into already-engaged threads by capillary action, so it locks pre-assembled fasteners without needing to disassemble the joint first. Q: Does Loctite 290 stay effective at both very low and very high temperatures? Yes — once cured it holds medium-to-high strength retention across a wide range of -55°C to +150°C, covering both cold storage and heated equipment applications. Q: Can Loctite 290 be used to seal porosity in castings, not just lock threads? Yes — its wicking action lets it penetrate and seal porosity in castings and welds, in addition to its primary role as a medium-strength threadlocker. Q: Why is Loctite 290's low viscosity useful? At an ultra-low viscosity of 40 mPa·s, it's drawn between engaged threads by capillary action, which is what lets it wick into a joint that's already assembled rather than needing to be applied before assembly. Show more