Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SPL 258L-SF23 found under Insert Screw Thread by Alcoa Global Fasteners Inc. The National Stock Number assigned to this part is 5325012945482, and the Federal Supply Class is 5325 Fastening Devices. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SPL 258L-SF23.