The LH Series of spherical roller bearings from NTN Bearing Corp. of America, West Orange, N.J., is made of material said to have greater hardness and stability than standard bearing materials. The bearings operate in temperatures up to 250°C. The material reduces surface fatigue, peeling, smearing, and wear and lowers dimensional instability to nearly zero. The bearings are available with outside diameters up to 420 mm.
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