An item generally round in shape and usually having a centrally located hole. It has at least one flat bearing surface. It is made of precious or semi-precious gem (ruby, sapphire and the like), natural or synthetic. It is intended for use in precision instruments, meters, timing devices, clocks, and the like.
jewel bearing part name assigned by controlling agency, steel overall material, a-10 aircraft, mechanical aircraft clock,type abu-11/a end item identification