This standard specifies the characteristics , of rigids ing l e row b a l l bearings of
diameter series 8 and 9 l ) , d e s I g n e d t o withstand only slow r o t a t I o n s and o s c I l l a t I o n s
under load. They a r e in'tended for use between fixed and moving p a r t s of t h e a I r -
c r a f t s t r u c t u r e and t h e I r c o n t r o l mechanisms.