Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2371-58 found under Screw Cap Hexagon H by Kollsman Inc. The National Stock Number assigned to this part is 5305003089053, 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 2371-58.