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GGB Bearing Technology, formerly Glacier Garlock Bearings, has developed MegaLife® XT, a line of thrust bearings with a self-lubricating sliding layer on both sides of a composite core. The sliding layer consists of a proprietary, seamless tape liner of PTFE blended with high-strength fillers and bonded to a core of continuously woven fiberglass encapsulated in a high-temperature epoxy resin.
The dual sliding layers offer a number of advantages compared with single-sided, metal-backed thrust bearings. The latter require extra care during installation to ensure rotation occurs only against the self-lubricating side of the bearing. Improper installation allowing rotation can result in metal-to-metal contact, excessive noise, heat and premature wear. Dual-sided bearings are not subject to the same restraints since they can "float" in the assembly, and do not require mounting with pins, tabs or notches to prevent rotation. Unlike metal-backed bearings, composite bearings also resist permanent deformation from impact loading, and typically recover their original shape.
The MegaLife XT bearings are designed for applications requiring high load capacity, moderate surface speed capability, good friction and wear properties, and resistance to shock, misalignment, contamination and corrosion. In addition, the bearings are non-conductive to preclude galvanic reactions. They provide ultimate compressive strength of 205 MPa, and can withstand maximum static and dynamic loads of 140 MPa. Maximum sliding speed is 0.50 m/s, and maximum PV factor is 1.23 MPa x m/s. Operating temperature ranges from -195
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 6801-2RU KOYO | 12 | 21 | 5 |
| 6300-2RU KOYO | 10 | 35 | 11 |