Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4090 found under Installation Tool Fastener Pneum by Lok Fast Inc. The National Stock Number assigned to this part is 5130005641492, and the Federal Supply Class is 5130 Hand Tools Power Driven. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4090.