Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R-TBD-220 found under Adapter Set Splined Wrench by Hi Shear Corporation. The National Stock Number assigned to this part is 5180011463217, and the Federal Supply Class is 5180 Sets Kits And Outfits Of Hand Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R-TBD-220.