Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HL12979PC220 found under Screw Machine by Dresser Rand Co. The National Stock Number assigned to this part is 5305000889050, and the Federal Supply Class is 5305 Screws. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like HL12979PC220.