>> Search results for: 551AMA NSN Search Results National Stock Number (NSN) Description 6680-00-542-1273, 6680005421273 TACHOMETER,MECHANICAL,FIXED MOUN 6680-00-696-3818 , 6680006963818 Cancelled -> Replaced by 6680002142245 1 Related Inventory Search You can use this search box to continue searching. Search parameters can include any combination of characteristics, specifications, description, partial part numbers, NSN or other stocking number. Special characters are not needed and are automatically stripped before searching. Do you sell this part? Become part of our growing pool of certified suppliers. Send Information