Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HH28 found under Screw Cutter Block by Sheridan Co The Easton Plant. The National Stock Number assigned to this part is 3610000187735, and the Federal Supply Class is 3610 Printing Duplicating And Bookbinding Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HH28.