Anaerobic adhesives media

Anaerobic adhesives are useful as a supplementary sealing medium for compression fittings which, despite claims to the contrary, often leak. Applying anaerobic adhesive immediately before assembling the union ensures a satisfactory seal. 

Threaded fasteners are occasionally supplied pre-coated with a locking medium in the form of a band of microencapsulated epoxy or anaerobic adhesive around the appropriate section of the screw thread. This ensures that the adhesive application is not overlooked. While microencapsulation is attractive and useful, its chequered history indicates limited potential any one of the following major drawbacks may be encountered in practice ... 

Anaerobics are ideal for locking and sealing threaded parts and, with few exceptions (discussed separately in Section 2.3.2.9), are normally the only adhesives to consider. A variety of vibration and impact tests have shown that even medium-strength grades out-perform all conventional means of maintaining bolt tension (see Table 2.3). Frequently the test specimens fail due to metal fatigue with the nut still firmly attached to the bolt shank. 

---