Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PK52 found under Nut Lock by Campbell Hausfeld Co. The National Stock Number assigned to this part is 4310004908918, and the Federal Supply Class is 4310 Compressors And Vacuum Pumps. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PK52.