Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SR0143 4 found under Floater Spring Screw by Devonport Royal Dockyard Limited. The National Stock Number assigned to this part is 4410011081558, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SR0143 4.