Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number K747 057 13 found under Lock Blade Bolt Mai by Kaman Aerospace Corporation. The National Stock Number assigned to this part is 1615015125294, and the Federal Supply Class is 1615 Helicopter Rotor Blades Drive Mechanisms And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like K747 057 13.