Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SK-2857 ITEM 47 found under Distribution Box by Insinger Machine Company The. The National Stock Number assigned to this part is 6110015241839, and the Federal Supply Class is 6110 Electrical Control Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SK-2857 ITEM 47.