![]() It gives up its hold a little easier than blue, which is a bonus if it’s holding small screws (which have small driver fittings). Purple: a slightly lower-strength threadlocker than blue that’s formulated for smaller-diameter fasteners, like set screws.Let’s take a look at each of these colors and what they indicate: Loctite 620 is used on BCG gas keys and sometimes used to bed AR barrels. Loctite 243 and 271 are commonly used here in the shop- There are some applications where Loctite 222 may be used. This can be true of some other brands as well, but should not be taken as an absolute. Within the commonly used Loctite brand, color can be somewhat of a universal means to denote threadlocker “strength.” Each “strength” of threadlocker will be color-coded which can aid in identification. With most threadlockers there are different formulations available and each might have a unique name from each manufacturer, but they are usually referenced by their color. Permatex is sometimes used in place of Loctite 620 sleeve retainer for sealing gas keys to the bolt carrier. You will also at times find the Permatex brand of threadlockers substituted for Loctite due to the common availability of the Permatex at automotive parts stores. There are three common threadlockers that can be found in use in the AR platform and these are Loctite, Vibra-tite VC3, and Rocksett. Loctite is a brand name for a product line, and not a generalized term. That is their job.īecause of name association, threadlockers are usually called “Loctite” and this is incorrect. The primary purpose of threadlockers is to dissuade unwanted movement otherwise primarily induced by vibration. Threadlockers have their places in the AR platform. But the use of the correct type of threadlocker as well as the application process is crucial to it being effective. ![]()
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