rat

The structure of the RAT made primarily from an alloy of aluminum and beryllium called Albemet because of its low density, high modulus and coefficient of thermal expansion that is similar to steel. Other structural materials include aluminum (7075 and 6061), steel (Vascomax C-250, 4140, 302, 303, 440C, A286, Nitronic 60) and titanium (6AL4V). Additional materials include Vespel, Nickel and 18k yellow gold. All of the bearings and gears are lubricated with a grease plate application of Braycote 600 EF micronic and are sealed with Teflon V seals to prevent dust from entering the mechanisms.

Cool! Amazing how space-age the instruments on this spacecraft sound :-)