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Key factors affecting the INA bearings life for many products of rotating machinery, they depend on the life of key parts of the bearing components in the product's life span. "Maintenance-free" will never damage or failure of bearings not bearing but within a certain amount of time can not be damaged. Designers calculate the bearing service life the service life of the bearing is greater than or equal to a machinery overhaul period so that the bearing can be "maintenance-free" in mechanical product overhaul and replace the bearing can be used INA bearing without maintenance.
1) must be corrosion of occasions because the cages that do not require high hardness, it can be made of austenitic stainless steel and 0Cr18Ni9 steel most commonly used;
2) in high temperature situations, also has plenty of high-temperature strength of austenitic stainless steel;
3) when when the special need for greater cage strength, can use low carbon steel for carbonitriding surface treatment;
4) requires self-lubricating condition, use graphite steel cage, or oil storage cage of porous materials;
5) when working in the field, sometimes requiring the material does not interfere with the magnetic field, or under the influence of external magnetic field.
INA bearing temperature, generally according to the external temperature of the housing speculation. But the temperature measurement of bearing outer ring with holes directly is more accurate. Bearing temperature, work gradually began to rise, usually temperature-stable after 1-2 hours. If adverse bearing installation, temperature rises dramatically, unusual high temperatures. Its causes, such as excessive grease, the bearing clearance is too small, poor installation, excessive seal friction. High speed rotation, bearings, lubrication and a cause, such as selecting the wrong way.
Grease lubrication seal-INA bearing in advance of filling grease in sealed, as well as filling amount of grease inside the crust, supplement or replace filling every once in a while for fat. In addition, there are multiple bearings require lubrication of machinery and pipes connected to the central lubrication grease. Grease lubrication can be achieved long after a grease filling without supplement and sealing device structure is simple, so widely used. Oil lubrication is relatively simple. Regular lubrication to the INA bearing service life.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-28150/28300 NTN | 38.1 | 76.2 | 20.94 |
| 4T-16150/16282 NTN | 38.1 | 72 | 20.638 |