Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ST3M557-3-13 found under Screw Close Tolerance by Twist Tite Mfg Inc. The National Stock Number assigned to this part is 5305015219556, 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 ST3M557-3-13.