A special single or multiple-row ball bearing, rigid or self-aligning, and constructed with either a solid or hollow shank, internally or externally threaded.
mil-g-23827 mil spec single material response lubrication material document and classification, rigid alignment type, 0.2920 inches minimum and 0.2970 inches maximum inner ring width, 2.8000 inches nominal length from bore center to shank end, 0.1900 inches nominal bore diameter