Loctite Threadlocker Color Choices

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whenever using Loctite, always use their primer/cleaner for good results Loctite Threadlocker NEVER choose by color alone. 271, Red: High strength threadlocker for larger diameter hardware. 262, Red: High strength threadlocker for for hardware smaller than that which uses 271, most commonly sold in auto parts stores. 609, Green: Retaining compound, high strength, for mounting slip fit bearings to shafts. 603, Green: Retaining compound, high strength, similar to 609 but good where the parts may be a little oily. 640: Green: Retaining compound, high strength. Similar to 609 and 603. Lacks the oil tolerance of 603. It has a little greater viscosity than 603. 638, Green: rather thick: Ultra strong retaining compound for assemblies with a marked amount of slop in the fit, min 0.004". Don't try to use this stuff for normal bearings on healthy shafts. It sets almost immediately in the tight gap, and you'll never have the chance to get the bearing into place. 290, Green: Wicking product for thread locking AFTER assembly. Medium strength, much stronger than 242 blue in my experience. Not the correct choice for bearing mounting per Loctite. 242, 243 Blue: Classic medium strength threadlocker for most of our threadlocking applications. 243 is the oil tolerant version. 222MS, Purple: Low strength threadlocker for small diameter or otherwise delicate fasteners. Bottom line: NEVER choose a Loctite threadlocker product by color alone. Let's not forget the latest and greatest product. 263. High strength and cures in the presence of contaminants. Cured 2 leaking transmission studs without removing the trans. this is especially good to seal leaks on Harley Transmissions 1936 - 1984, as the mounting stud openings are tapped through and into the case that's filled with lube LOCTITE® 263™ is designed for the permanent locking and sealing of threaded fasteners. The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. LOCTITE® 263™ is particularly suited for heavy duty applications such as studs into motor housings, nuts onto studs in pump housings and other fasteners where high strength is required. LOCTITE® 263™ provides robust curing performance. It not only works on active metals (e.g. brass, copper) but also on passive substrates such as stainless steel and plated surfaces. The product offers high temperature performance and oil tolerance. It tolerates minor surface contaminations from various oils, such as cutting, lubrication, anti-corrosion and protection fluids. __________________