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1615-14-253-4401 1615142534401 142534401 is a chamber surrounding the main bearing for a transmission. the chamber is used to collect lubricating fluid for recirculation.

5345-00-253-4401 5345002534401 002534401 is a piece of abrasive of any shape designed to be held in the hand or to remain stationary while the item to be sharpened is moved against it or the piece of abrasive is moved against the item.

2835-22-253-4401 2835222534401 222534401 is an externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. the threaded and unthreaded portions are both of one nominal diameter of 0.190 inch (5 mm) or larger. the head is not designed to be held or driven with an inserted driver or by the thumb and fingers. a locking feature may be incorporated in the design of the head or threads. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. for items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, bolt, shear. see also screw, cap, hexagon head and screw, machine.

1560-99-253-4401 1560992534401 992534401 is an item composed of fiber, plastic foam, synthetic material, etc., in various shapes and sizes and may contain bolt hole(s). it is attached to the airframe and designed to entrap and dissipate sound energy. excludes insulation,thermal (as modified); insulation blanket,cabin,aircraft; and insulation blanket,thermal (as modified).

1615-99-551-3022 1615995513022 995513022 is a chamber surrounding the main bearing for a transmission. the chamber is used to collect lubricating fluid for recirculation.