When Should You Use Blue Loctite Vs Red? The medium strength blue formula of Loctite's threadlocker is meant for fastener threads larger than 6 mm (1/4 inch) and smaller than 20 mm (3/4 inch) and ...

Finally, Green Loctite Threadlocker 290 is a wicking compound, which means it's made for pre-assembled pieces. Drop it on, and it will work its way into a fastener's nooks and crannies, sealing ...

The medium strength blue formula of Loctite's threadlocker is meant for fastener threads larger than 6 mm (1/4 inch) and smaller than 20 mm (3/4 inch) and is removable.