Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SII 1058N4D2125 found under Bolt Shoulder by Sonic Industries Inc. The National Stock Number assigned to this part is 5306010618344, and the Federal Supply Class is 5306 Bolts. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SII 1058N4D2125.