Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4444923-505 found under Collar Assy Aft Doo by K And K Precision Manufacturing Inc. The National Stock Number assigned to this part is 1560009184266, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4444923-505.