Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21542 found under Cap Pillow Block by Tulsa Winch Inc. The National Stock Number assigned to this part is 3130012948088, and the Federal Supply Class is 3130 Bearings Mounted. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21542.