Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4100028 found under Screwmachine by 901 D Llc. The National Stock Number assigned to this part is 5305016966348, 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 4100028.