Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SL4906-428 found under Nut Self Locking Extended Washer by Republic Fastener Mfg Corp. The National Stock Number assigned to this part is 5310009426854, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SL4906-428.