Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PST H254BK found under Insulation Sleeving by Hellermanntyton Corporation. The National Stock Number assigned to this part is 5970121514427, and the Federal Supply Class is 5970 Electrical Insulators And Insulating Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PST H254BK.