Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SEELSKREWR1 4-20X3 8 4601 18-8 found under Screw Machine by A P M Hexseal Corporation. The National Stock Number assigned to this part is 5305015223516, 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 SEELSKREWR1 4-20X3 8 4601 18-8.