A single or multiple piece item without ball, plain or roller bearing(s). It is designed to meet various or specific conditions of mounting. For items with bearings, see bearing unit, ball; bearing unit, plain; and bearing unit, roller.
aluminum alloy overall material, quality control in accordance with navships 0948-045-7010 material identification and control instruction for level 1 items reference number differentiating characteristics, zzzy criticality code justification