Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST3M454-6L20 found under Screw Close Toleran by Heartland Precision Fasteners Inc. The National Stock Number assigned to this part is 5305015680715, 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 ST3M454-6L20.