Needle roller bearings are roller bearings, which have a high load carrying capacity with a very small section height. They are available with or without an inner ring. In all needle roller bearings, except for full complement needle roller bearings, the needle rollers themselves are guided parallel to the axis by a dimensionally stable cage. Airframe needle roller bearings are specified by MIL-B-3990 and National Academy of Sciences (NAS) standards. Radial airframe bearings are designed for static loads and oscillation or slow rotation. They consist of an inner and outer ring with a full complement of needle rollers in a single or double row. These bearings must be supported by housings and mounted on high-strength shafts for maximum load capacity. Self-aligning designs can typically accommodate up to ±5° of dynamic misalignment.
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