>> Search results for: CPTXL NSN Search Results National Stock Number (NSN) Description 6635-01-257-7236, 6635012577236 TESTER,MATERIAL HARDNESS 6635-01-664-0871 , 6635016640871 TESTER,MATERIAL HARDNESS 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