Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4854-4500-20 found under Gearshaft Helical by Mcnally Industries Llc. The National Stock Number assigned to this part is 3040004203915, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4854-4500-20.