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Loctite® Retaining Compounds
Loctite® Retaining Compounds
Loctite® Retaining Compounds
Most bearing failures are due to one or more of the following:
1. Defective bearing seats on shafts and in housings*
2. Misalignment
3. Faulty mounting practice*
4. Incorrect shaft and housing fits*
5. Inadequate lubrication
6. Inexpensive sealing
7. Vibration while bearing is not rotating*
8. Electrical current passage through bearings
*Proper use of Loctite® Retaining Compounds vs mechanical methods can eliminate 4 out of 8 of these bearing failures and more.
Loctite® Retaining Compounds secure bearings, bushings, and cylindrical parts into housings or onto shafts. They achieve maximum load transmission capability and uniform stress distribution, and eliminate fretting corrosion – a major cause of bearing failure. Fretting corrosion occurs when rough, uneven surfaces are damaged due to induced load and the presence of repeated surface motion such as vibration.
Once applied, Loctite® Retaining Compounds form a 100% contact between mating metal surfaces, thereby filling all voids and preventing corrosion. Retaining Compounds eliminate the need for expensive replacement parts, time consuming machining to meet closer tolerances, and the use of traditional mechanical methods.
Loctite® Retaining compounds reduce the risk of galling, which occurs when soft metals, such as aluminum alloys and stainless steel are forced together. The retaining compound acts as a lubricant, thus reducing the risk of this occurring.
Loctite® Retaining Compounds are superior to conventional assembly methods in more ways than cost savings alone:
• Pins, key/keyway assemblies have an uneven distribution of mass, creating an imbalance that can lead to vibration at high speeds.
• Backlash is a common occurrence in keys and splines. Splines and serrations cause high stresses due to the “notch effect” that occurs in the area of a key. This typically results in high machining costs.
• Clamp rings, press fits, shrink fits, and taper fits rely on friction alone to transmit torque, therefore, they are limited by material, surface finish, and design. Close machining tolerances are needed to obtain specific load capacities, leading to high production costs. Interference fitting creates stresses in the components that can lead to failure, particularly when combined with operational stresses.
• Welding and soldering requires compatible metals be joined and distorted by the high temperatures required. Heating of the material can lead to residual stresses and structural degradation. In addition, disassembly can be difficult or impossible.
Key factors to consider when choosing the right Loctite® Retaining Compound:
1. Gap size between parts… Gaps up to .015’’ may be filled when selecting a Loctite® Retaining Compound with the proper viscosity.
2. Temperature resistance… Most retaining compounds have a temperature resistance of 300°F, while some offer resistance up to 450°F.
3. Bond strength… A variety of strengths are available depending if the final product needs to be serviced or not.
4. Cure speed… Depending on the speed of production, retaining compounds are available in varying cure speeds.
Click the image above to view and select the right Loctite® Retaining Compound for your application. Need application assistance? Contact your local BDI representative.