>> Search results for: 257R21REVAPC2 NSN Search Results National Stock Number (NSN) Description 5360-00-664-4354, 5360006644354 SPRING,HELICAL,COMPRESSION 5331-00-054-6939 , 5331000546939 Cancelled -> Replaced by 5330011139053 5331-00-816-3546, 5331008163546 Cancelled -> Replaced by 5330011718703 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