Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SN63BS 1LB found under Solder Tin Alloy by Kester Solder Co. The National Stock Number assigned to this part is 3439010199100, and the Federal Supply Class is 3439 Miscellaneous Welding Soldering And Brazing Supplies And Accessories. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SN63BS 1LB.