Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 10-307-3 found under Pulley Outboard Mandrel by Kut Kwick Corporation. The National Stock Number assigned to this part is 3750001971329, and the Federal Supply Class is 3750 Gardening Implements And Tools. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 10-307-3.