THB Self-aligning ball bearings have two rows of balls, a common sphered raceway in the outer ring and two deep uninterrupted raceway grooves in the inner ring. Available with open or sealed version. Available with cylindrical bore and tapered bore. Available with steel cage, nylon cage, brass cage and ceramic cage. Rings and balls material: GCr15, silicon nitride, zirconia or silicon carbide, stainless steel.