Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4F51238-101A found under Seal Nonmetallic Sp by Handy Tool And Mfg Co Inc The. The National Stock Number assigned to this part is 5330007819468, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4F51238-101A.